diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9feac5fa0f..3e87fa1b2e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,13 +10,13 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@main
         with:
           fetch-depth: 2
       - name: Init Test Suite
-        uses: potatoqualitee/psmodulecache@v4
+        uses: potatoqualitee/psmodulecache@v5.1
         with:
-          modules-to-cache: PSScriptAnalyzer, BuildHelpers, Pester:4.10.1
+          modules-to-cache: BuildHelpers
           shell: powershell
       - name: Test Scoop Core
         shell: powershell
@@ -26,13 +26,13 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@main
         with:
           fetch-depth: 2
       - name: Init Test Suite
-        uses: potatoqualitee/psmodulecache@v4
+        uses: potatoqualitee/psmodulecache@v5.1
         with:
-          modules-to-cache: PSScriptAnalyzer, BuildHelpers, Pester:4.10.1
+          modules-to-cache: BuildHelpers
           shell: pwsh
       - name: Test Scoop Core
         shell: pwsh
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 94beb9b878..8ae5f38000 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,48 @@
+## [v0.3.1](https://github.com/ScoopInstaller/Scoop/compare/v0.3.0...v0.3.1) - 2022-11-15
+
+### Features
+
+- **config:** Allow Scoop to check if apps versioned as 'nightly' are outdated ([#5166](https://github.com/ScoopInstaller/Scoop/issues/5166))
+- **checkup:** Add Windows Developer Mode check ([#5233](https://github.com/ScoopInstaller/Scoop/issues/5233))
+- **bucket:** Add 'sysinternals' bucket to known ([#5237](https://github.com/ScoopInstaller/Scoop/issues/5237))
+
+### Bug Fixes
+
+- **decompress:** Use PS's default 'Expand-Archive()' ([#5185](https://github.com/ScoopInstaller/Scoop/issues/5185))
+- **hash:** Fix SourceForge's hash extraction ([#5189](https://github.com/ScoopInstaller/Scoop/issues/5189))
+- **decompress:** Trim ending '/' ([#5195](https://github.com/ScoopInstaller/Scoop/issues/5195))
+- **shim:** Exit if shim creating failed 'cause no git ([#5225](https://github.com/ScoopInstaller/Scoop/issues/5225))
+- **scoop-import:** Add correct architecture argument ([#5210](https://github.com/ScoopInstaller/Scoop/issues/5210))
+- **scoop-config:** Output `[DateTime]` as `[String]` ([#5232](https://github.com/ScoopInstaller/Scoop/issues/5232))
+
+### Code Refactoring
+
+- **hash:** Use `Get-FileHash()` directly ([#5177](https://github.com/ScoopInstaller/Scoop/issues/5177))
+- **installer:** Drop the old installer ([#5186](https://github.com/ScoopInstaller/Scoop/issues/5186))
+- **unix:** Remove `unix.ps1` ([#5235](https://github.com/ScoopInstaller/Scoop/issues/5235))
+
+### Builds
+
+- **auto-pr:** Add `CommitMessageFormat` option ([#5171](https://github.com/ScoopInstaller/Scoop/issues/5171))
+- **checkver:** Support XML default namespace ([#5191](https://github.com/ScoopInstaller/Scoop/issues/5191))
+- **pssa:** Remove unused 'ExcludeRules' ([#5201](https://github.com/ScoopInstaller/Scoop/issues/5201))
+- **schema:** Add 'installer' and 'shortcuts' to 'autoupdate' ([#5220](https://github.com/ScoopInstaller/Scoop/issues/5220))
+- **checkhashes:** Use correct version number if `UseCache` ([#5240](https://github.com/ScoopInstaller/Scoop/issues/5240))
+
+### Continuous Integration
+
+- **module:** Update modules version ([#5209](https://github.com/ScoopInstaller/Scoop/issues/5209))
+
+### Tests
+
+- **unix:** Fix tests in Linux and macOS ([#5179](https://github.com/ScoopInstaller/Scoop/issues/5179))
+- **pester:** Update to Pester 5 ([#5222](https://github.com/ScoopInstaller/Scoop/issues/5222))
+- **bucket:** Use BuildHelpers' EnvVars ([#5226](https://github.com/ScoopInstaller/Scoop/issues/5226))
+
+### Documentation
+
+- **scoop-cat:** Fix help message([#5224](https://github.com/ScoopInstaller/Scoop/issues/5224))
+
 ## [v0.3.0](https://github.com/ScoopInstaller/Scoop/compare/v0.2.4...v0.3.0) - 2022-10-10
 
 ### Features
diff --git a/PSScriptAnalyzerSettings.psd1 b/PSScriptAnalyzerSettings.psd1
index f3af0dd8b8..9ef165869e 100644
--- a/PSScriptAnalyzerSettings.psd1
+++ b/PSScriptAnalyzerSettings.psd1
@@ -1,6 +1,3 @@
-# The PowerShell Script Analyzer will generate a warning
-# diagnostic record for this file due to a bug -
-# https://github.com/PowerShell/PSScriptAnalyzer/issues/472
 @{
     # Only diagnostic records of the specified severity will be generated.
     # Uncomment the following line if you only want Errors and Warnings but
@@ -26,12 +23,6 @@
     # will be excluded.
     ExcludeRules = @(
         # Currently Scoop widely uses Write-Host to output colored text.
-        'PSAvoidUsingWriteHost',
-        # Temporarily allow uses of Invoke-Expression,
-        # this command is used by some core functions and hard to be removed.
-        'PSAvoidUsingInvokeExpression',
-        # PSUseDeclaredVarsMoreThanAssignments doesn't currently work due to:
-        # https://github.com/PowerShell/PSScriptAnalyzer/issues/636
-        'PSUseDeclaredVarsMoreThanAssignments'
+        'PSAvoidUsingWriteHost'
     )
 }
diff --git a/README.md b/README.md
index 627b73a425..9895584498 100644
--- a/README.md
+++ b/README.md
@@ -120,17 +120,21 @@ The following buckets are known to scoop:
 - [games](https://github.com/Calinou/scoop-games) - Open source/freeware games and game-related tools
 - [nerd-fonts](https://github.com/matthewjberger/scoop-nerd-fonts) -  Nerd Fonts
 - [nirsoft](https://github.com/kodybrown/scoop-nirsoft) - Almost all of the [250+](https://rasa.github.io/scoop-directory/by-apps#kodybrown_scoop-nirsoft) apps from [Nirsoft](https://nirsoft.net)
+- [sysinternals](https://github.com/niheaven/scoop-sysinternals) - Sysinternals Suite and all individual application from [Microsoft](https://learn.microsoft.com/sysinternals/)
 - [java](https://github.com/ScoopInstaller/Java) - A collection of Java development kits (JDKs), Java runtime engines (JREs), Java's virtual machine debugging tools and Java based runtime engines.
 - [nonportable](https://github.com/ScoopInstaller/Nonportable) - Non-portable apps (may require UAC)
 - [php](https://github.com/ScoopInstaller/PHP) - Installers for most versions of PHP
 - [versions](https://github.com/ScoopInstaller/Versions) - Alternative versions of apps found in other buckets
 
 The main bucket is installed by default. To add any of the other buckets, type:
-```
+
+```console
 scoop bucket add bucketname
 ```
+
 For example, to add the extras bucket, type:
-```
+
+```console
 scoop bucket add extras
 ```
 
diff --git a/bin/auto-pr.ps1 b/bin/auto-pr.ps1
index 390d2117ec..766e49764d 100644
--- a/bin/auto-pr.ps1
+++ b/bin/auto-pr.ps1
@@ -11,6 +11,10 @@
 .PARAMETER App
     Manifest name to search.
     Placeholders are supported.
+.PARAMETER CommitMessageFormat
+    The format of the commit message.
+    <app> will be replaced with the file name of manifest.
+    <version> will be replaced with the version of the latest manifest.
 .PARAMETER Dir
     The directory where to search for manifests.
 .PARAMETER Push
@@ -43,6 +47,7 @@ param(
     [String] $Upstream,
     [String] $OriginBranch = 'master',
     [String] $App = '*',
+    [String] $CommitMessageFormat = '<app>: Update to version <version>',
     [ValidateScript( {
         if (!(Test-Path $_ -Type Container)) {
             throw "$_ is not a directory!"
@@ -61,7 +66,6 @@ param(
 
 . "$PSScriptRoot\..\lib\manifest.ps1"
 . "$PSScriptRoot\..\lib\json.ps1"
-. "$PSScriptRoot\..\lib\unix.ps1"
 
 if ($App -ne '*' -and (Test-Path $App -PathType Leaf)) {
     $Dir = Split-Path $App
@@ -87,7 +91,7 @@ Optional options:
     exit 0
 }
 
-if (is_unix) {
+if ($IsLinux -or $IsMacOS) {
     if (!(which hub)) {
         Write-Host "Please install hub ('brew install hub' or visit: https://hub.github.com/)" -ForegroundColor Yellow
         exit 1
@@ -110,7 +114,7 @@ function execute($cmd) {
     return $output
 }
 
-function pull_requests($json, [String] $app, [String] $upstream, [String] $manifest) {
+function pull_requests($json, [String] $app, [String] $upstream, [String] $manifest, [String] $commitMessage) {
     $version = $json.version
     $homepage = $json.homepage
     $branch = "manifest/$app-$version"
@@ -127,7 +131,7 @@ function pull_requests($json, [String] $app, [String] $upstream, [String] $manif
     Write-Host "Creating update $app ($version) ..." -ForegroundColor DarkCyan
     execute "hub checkout -b $branch"
     execute "hub add $manifest"
-    execute "hub commit -m '${app}: Update to version $version'"
+    execute "hub commit -m '$commitMessage"
     Write-Host "Pushing update $app ($version) ..." -ForegroundColor DarkCyan
     execute "hub push origin $branch"
 
@@ -142,7 +146,7 @@ function pull_requests($json, [String] $app, [String] $upstream, [String] $manif
     Write-Host "hub pull-request -m '<msg>' -b '$upstream' -h '$branch'" -ForegroundColor Green
 
     $msg = @"
-$app`: Update to version $version
+$commitMessage
 
 Hello lovely humans,
 a new version of [$app]($homepage) is available.
@@ -155,7 +159,7 @@ a new version of [$app]($homepage) is available.
     hub pull-request -m "$msg" -b "$upstream" -h "$branch"
     if ($LASTEXITCODE -gt 0) {
         execute 'hub reset'
-        abort "Pull Request failed! (hub pull-request -m '${app}: Update to version $version' -b '$upstream' -h '$branch')"
+        abort "Pull Request failed! (hub pull-request -m '$commitMessage' -b '$upstream' -h '$branch')"
     }
 }
 
@@ -189,7 +193,7 @@ hub diff --name-only | ForEach-Object {
         return
     }
     $version = $json.version
-
+    $CommitMessage = $CommitMessageFormat -replace '<app>',$app -replace '<version>',$version
     if ($Push) {
         Write-Host "Creating update $app ($version) ..." -ForegroundColor DarkCyan
         execute "hub add $manifest"
@@ -198,12 +202,12 @@ hub diff --name-only | ForEach-Object {
         $status = execute 'hub status --porcelain -uno'
         $status = $status | Where-Object { $_ -match "M\s{2}.*$app.json" }
         if ($status -and $status.StartsWith('M  ') -and $status.EndsWith("$app.json")) {
-            execute "hub commit -m '${app}: Update to version $version'"
+            execute "hub commit -m '$commitMessage'"
         } else {
             Write-Host "Skipping $app because only LF/CRLF changes were detected ..." -ForegroundColor Yellow
         }
     } else {
-        pull_requests $json $app $Upstream $manifest
+        pull_requests $json $app $Upstream $manifest $CommitMessage
     }
 }
 
diff --git a/bin/checkhashes.ps1 b/bin/checkhashes.ps1
index fac1787839..0420ee1fa8 100644
--- a/bin/checkhashes.ps1
+++ b/bin/checkhashes.ps1
@@ -47,7 +47,6 @@ param(
 . "$PSScriptRoot\..\lib\json.ps1"
 . "$PSScriptRoot\..\lib\versions.ps1"
 . "$PSScriptRoot\..\lib\install.ps1"
-. "$PSScriptRoot\..\lib\unix.ps1"
 
 $Dir = Convert-Path $Dir
 if ($ForceUpdate) { $Update = $true }
@@ -114,13 +113,16 @@ foreach ($current in $MANIFESTS) {
 
     $current.urls | ForEach-Object {
         $algorithm, $expected = get_hash $current.hashes[$count]
-        $version = 'HASH_CHECK'
-        $tmp = $expected_hash -split ':'
+        if ($UseCache) {
+            $version = $current.manifest.version
+        } else {
+            $version = 'HASH_CHECK'
+        }
 
         Invoke-CachedDownload $current.app $version $_ $null $null -use_cache:$UseCache
 
         $to_check = fullpath (cache_path $current.app $version $_)
-        $actual_hash = compute_hash $to_check $algorithm
+        $actual_hash = (Get-FileHash -Path $to_check -Algorithm $algorithm).Hash.ToLower()
 
         # Append type of algorithm to both expected and actual if it's not sha256
         if ($algorithm -ne 'sha256') {
@@ -145,12 +147,12 @@ foreach ($current in $MANIFESTS) {
         Write-Host 'Mismatch found ' -ForegroundColor Red
         $mismatched | ForEach-Object {
             $file = fullpath (cache_path $current.app $version $current.urls[$_])
-            Write-Host  "`tURL:`t`t$($current.urls[$_])"
+            Write-Host "`tURL:`t`t$($current.urls[$_])"
             if (Test-Path $file) {
-                Write-Host  "`tFirst bytes:`t$((get_magic_bytes_pretty $file ' ').ToUpper())"
+                Write-Host "`tFirst bytes:`t$((get_magic_bytes_pretty $file ' ').ToUpper())"
             }
-            Write-Host  "`tExpected:`t$($current.hashes[$_])" -ForegroundColor Green
-            Write-Host  "`tActual:`t`t$($actuals[$_])" -ForegroundColor Red
+            Write-Host "`tExpected:`t$($current.hashes[$_])" -ForegroundColor Green
+            Write-Host "`tActual:`t`t$($actuals[$_])" -ForegroundColor Red
         }
     }
 
diff --git a/bin/checkver.ps1 b/bin/checkver.ps1
index 0205a36639..56b8c8c987 100644
--- a/bin/checkver.ps1
+++ b/bin/checkver.ps1
@@ -74,7 +74,6 @@ param(
 . "$PSScriptRoot\..\lib\json.ps1"
 . "$PSScriptRoot\..\lib\versions.ps1"
 . "$PSScriptRoot\..\lib\install.ps1" # needed for hash generation
-. "$PSScriptRoot\..\lib\unix.ps1"
 
 if ($App -ne '*' -and (Test-Path $App -PathType Leaf)) {
     $Dir = Split-Path $App
@@ -310,12 +309,17 @@ while ($in_progress -gt 0) {
             # Then add them into the NamespaceManager
             $nsmgr = New-Object System.Xml.XmlNamespaceManager($xml.NameTable)
             $nsList | ForEach-Object {
-                $nsmgr.AddNamespace($_.LocalName, $_.Value)
+                if ($_.LocalName -eq 'xmlns') {
+                    $nsmgr.AddNamespace('ns', $_.Value)
+                    $xpath = $xpath -replace '/([^:/]+)((?=/)|(?=$))', '/ns:$1'
+                } else {
+                    $nsmgr.AddNamespace($_.LocalName, $_.Value)
+                }
             }
             # Getting version from XML, using XPath
             $ver = $xml.SelectSingleNode($xpath, $nsmgr).'#text'
             if (!$ver) {
-                next "couldn't find '$xpath' in $url"
+                next "couldn't find '$($xpath -replace 'ns:', '')' in $url"
                 continue
             }
         }
diff --git a/bin/install.ps1 b/bin/install.ps1
index b3942513e4..b7f35591e8 100644
--- a/bin/install.ps1
+++ b/bin/install.ps1
@@ -1,78 +1,2 @@
 #Requires -Version 5
-
-# remote install:
-#   Invoke-Expression (New-Object System.Net.WebClient).DownloadString('https://get.scoop.sh')
-$old_erroractionpreference = $erroractionpreference
-$erroractionpreference = 'stop' # quit if anything goes wrong
-
-if (($PSVersionTable.PSVersion.Major) -lt 5) {
-    Write-Output "PowerShell 5 or later is required to run Scoop."
-    Write-Output "Upgrade PowerShell: https://docs.microsoft.com/en-us/powershell/scripting/setup/installing-windows-powershell"
-    break
-}
-
-# show notification to change execution policy:
-$allowedExecutionPolicy = @('Unrestricted', 'RemoteSigned', 'ByPass')
-if ((Get-ExecutionPolicy).ToString() -notin $allowedExecutionPolicy) {
-    Write-Output "PowerShell requires an execution policy in [$($allowedExecutionPolicy -join ", ")] to run Scoop."
-    Write-Output "For example, to set the execution policy to 'RemoteSigned' please run :"
-    Write-Output "'Set-ExecutionPolicy RemoteSigned -scope CurrentUser'"
-    break
-}
-
-if ([System.Enum]::GetNames([System.Net.SecurityProtocolType]) -notcontains 'Tls12') {
-    Write-Output "Scoop requires at least .NET Framework 4.5"
-    Write-Output "Please download and install it first:"
-    Write-Output "https://www.microsoft.com/net/download"
-    break
-}
-
-# get core functions
-$core_url = 'https://raw.githubusercontent.com/ScoopInstaller/Scoop/master/lib/core.ps1'
-Write-Output 'Initializing...'
-Invoke-Expression (new-object net.webclient).downloadstring($core_url)
-
-# prep
-if (Get-Command -Name 'scoop' -ErrorAction SilentlyContinue) {
-    write-host "Scoop is already installed. Run 'scoop update' to get the latest version." -f red
-    # don't abort if invoked with iex that would close the PS session
-    if ($myinvocation.mycommand.commandtype -eq 'Script') { return } else { exit 1 }
-}
-$dir = ensure (versiondir 'scoop' 'current')
-
-# download scoop zip
-$zipUrl = 'https://github.com/ScoopInstaller/Scoop/archive/master.zip'
-$zipFile = "$dir\scoop.zip"
-Write-Output 'Downloading scoop...'
-Invoke-WebRequest -Uri $zipUrl -OutFile $zipFile
-
-Write-Output 'Extracting...'
-Add-Type -Assembly "System.IO.Compression.FileSystem"
-[IO.Compression.ZipFile]::ExtractToDirectory($zipfile, "$dir\_tmp")
-Copy-Item "$dir\_tmp\*master\*" $dir -Recurse -Force
-Remove-Item "$dir\_tmp", $zipfile -Recurse -Force
-
-Write-Output 'Creating shim...'
-shim "$dir\bin\scoop.ps1" $false
-
-# download main bucket
-$dir = "$scoopdir\buckets\main"
-$zipUrl = 'https://github.com/ScoopInstaller/Main/archive/master.zip'
-$zipFile = "$dir\main-bucket.zip"
-Write-Output 'Downloading main bucket...'
-New-Item -Path $dir -Type Directory -Force | Out-Null
-Invoke-WebRequest -Uri $zipUrl -OutFile $zipFile
-
-Write-Output 'Extracting...'
-[IO.Compression.ZipFile]::ExtractToDirectory($zipfile, "$dir\_tmp")
-Copy-Item "$dir\_tmp\*-master\*" $dir -Recurse -Force
-Remove-Item "$dir\_tmp", $zipfile -Recurse -Force
-
-ensure_robocopy_in_path
-
-set_config LAST_UPDATE ([System.DateTime]::Now.ToString('o')) | Out-Null
-success 'Scoop was installed successfully!'
-
-Write-Output "Type 'scoop help' for instructions."
-
-$erroractionpreference = $old_erroractionpreference # Reset $erroractionpreference to original value
+Invoke-RestMethod https://get.scoop.sh | Invoke-Expression
diff --git a/buckets.json b/buckets.json
index ff5ab7c0e6..b192cac40f 100644
--- a/buckets.json
+++ b/buckets.json
@@ -3,6 +3,7 @@
     "extras": "https://github.com/ScoopInstaller/Extras",
     "versions": "https://github.com/ScoopInstaller/Versions",
     "nirsoft": "https://github.com/kodybrown/scoop-nirsoft",
+    "sysinternals": "https://github.com/niheaven/scoop-sysinternals",
     "php": "https://github.com/ScoopInstaller/PHP",
     "nerd-fonts": "https://github.com/matthewjberger/scoop-nerd-fonts",
     "nonportable": "https://github.com/ScoopInstaller/Nonportable",
diff --git a/lib/autoupdate.ps1 b/lib/autoupdate.ps1
index dc9dbffeb3..6edc8791ff 100644
--- a/lib/autoupdate.ps1
+++ b/lib/autoupdate.ps1
@@ -248,7 +248,7 @@ function get_hash_for_app([String] $app, $config, [String] $version, [String] $u
         'sourceforge' {
             # change the URL because downloads.sourceforge.net doesn't have checksums
             $hashfile_url = (strip_filename (strip_fragment "https://sourceforge.net/projects/$($matches['project'])/files/$($matches['file'])")).TrimEnd('/')
-            $hash = find_hash_in_textfile $hashfile_url $substitutions '"$basename":.*?"sha1":\s"([a-fA-F0-9]{40})"'
+            $hash = find_hash_in_textfile $hashfile_url $substitutions '"$basename":.*?"sha1":\s*"([a-fA-F0-9]{40})"'
         }
     }
 
@@ -274,7 +274,7 @@ function get_hash_for_app([String] $app, $config, [String] $version, [String] $u
         return $null
     }
     $file = fullpath (cache_path $app $version $url)
-    $hash = compute_hash $file 'sha256'
+    $hash = (Get-FileHash -Path $file -Algorithm SHA256).Hash.ToLower()
     write-host -f DarkYellow 'Computed hash: ' -NoNewline
     write-host -f Green $hash
     return $hash
diff --git a/lib/core.ps1 b/lib/core.ps1
index db305b5e26..bc0365eb03 100644
--- a/lib/core.ps1
+++ b/lib/core.ps1
@@ -806,6 +806,11 @@ function shim($path, $global, $name, $arg) {
     } else {
         warn_on_overwrite "$shim.cmd" $path
         # find path to Git's bash so that batch scripts can run bash scripts
+        if (!(Get-CommandPath git)) {
+            error "Can't shim '$shim': 'git' is needed but not installed."
+            error "Please install git ('scoop install git') and try again."
+            exit 1
+        }
         $gitdir = (Get-Item (Get-CommandPath git) -ErrorAction:Stop).Directory.Parent
         if ($gitdir.FullName -imatch 'mingw') {
             $gitdir = $gitdir.Parent
@@ -1251,10 +1256,10 @@ if ($scoopConfig) {
 # END NOTE
 
 # Scoop root directory
-$scoopdir = $env:SCOOP, (get_config ROOT_PATH), "$env:USERPROFILE\scoop" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
+$scoopdir = $env:SCOOP, (get_config ROOT_PATH), "$([System.Environment]::GetFolderPath('UserProfile'))\scoop" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
 
 # Scoop global apps directory
-$globaldir = $env:SCOOP_GLOBAL, (get_config GLOBAL_PATH), "$env:ProgramData\scoop" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
+$globaldir = $env:SCOOP_GLOBAL, (get_config GLOBAL_PATH), "$([System.Environment]::GetFolderPath('CommonApplicationData'))\scoop" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
 
 # Scoop cache directory
 # Note: Setting the SCOOP_CACHE environment variable to use a shared directory
diff --git a/lib/decompress.ps1 b/lib/decompress.ps1
index b56402b1d5..91226706d1 100644
--- a/lib/decompress.ps1
+++ b/lib/decompress.ps1
@@ -28,6 +28,7 @@ function Expand-7zipArchive {
         $7zPath = Get-HelperPath -Helper 7zip
     }
     $LogPath = "$(Split-Path $Path)\7zip.log"
+    $DestinationPath = $DestinationPath.TrimEnd('\')
     $ArgList = @('x', $Path, "-o$DestinationPath", '-y')
     $IsTar = ((strip_ext $Path) -match '\.tar$') -or ($Path -match '\.t[abgpx]z2?$')
     if (!$IsTar -and $ExtractDir) {
@@ -240,7 +241,8 @@ function Expand-ZipArchive {
         $OriDestinationPath = $DestinationPath
         $DestinationPath = "$DestinationPath\_tmp"
     }
-    Expand-Archive -Path $Path -DestinationPath $DestinationPath -Force
+    # Compatible with Pscx v3 (https://github.com/Pscx/Pscx) ('Microsoft.PowerShell.Archive' is not needed for Pscx v4)
+    Microsoft.PowerShell.Archive\Expand-Archive -Path $Path -DestinationPath $DestinationPath -Force
     if ($ExtractDir) {
         movedir "$DestinationPath\$ExtractDir" $OriDestinationPath | Out-Null
         Remove-Item $DestinationPath -Recurse -Force
diff --git a/lib/diagnostic.ps1 b/lib/diagnostic.ps1
index 5caf8e7c7e..e4cc97e6a2 100644
--- a/lib/diagnostic.ps1
+++ b/lib/diagnostic.ps1
@@ -53,3 +53,17 @@ function check_long_paths {
 
     return $true
 }
+
+function Get-WindowsDeveloperModeStatus {
+    $DevModRegistryPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock"
+    if (!(Test-Path -Path $DevModRegistryPath) -or (Get-ItemProperty -Path `
+        $DevModRegistryPath -Name AllowDevelopmentWithoutDevLicense -ErrorAction `
+        SilentlyContinue).AllowDevelopmentWithoutDevLicense -ne 1) {
+        warn "Windows Developer Mode is not enabled. Operations relevant to symlinks may fail without proper rights."
+        Write-Host "  You may read more about the symlinks support here:"
+        Write-Host "  https://blogs.windows.com/windowsdeveloper/2016/12/02/symlinks-windows-10/"
+        return $false
+    }
+
+    return $true
+}
diff --git a/lib/getopt.ps1 b/lib/getopt.ps1
index ce12aae9f5..74ffae7c52 100644
--- a/lib/getopt.ps1
+++ b/lib/getopt.ps1
@@ -25,7 +25,7 @@ function getopt($argv, $shortopts, $longopts) {
     }
 
     # ensure these are arrays
-    $argv = @($argv)
+    $argv = @($argv -split ' ')
     $longopts = @($longopts)
 
     for ($i = 0; $i -lt $argv.Length; $i++) {
diff --git a/lib/install.ps1 b/lib/install.ps1
index fe5a99f00d..cdbfdf1a79 100644
--- a/lib/install.ps1
+++ b/lib/install.ps1
@@ -1,9 +1,8 @@
-function nightly_version($date, $quiet = $false) {
-    $date_str = $date.tostring("yyyyMMdd")
+function nightly_version($quiet = $false) {
     if (!$quiet) {
         warn "This is a nightly version. Downloaded files won't be verified."
     }
-    "nightly-$date_str"
+    return "nightly-$(Get-Date -Format 'yyyyMMdd')"
 }
 
 function install_app($app, $architecture, $global, $suggested, $use_cache = $true, $check_hash = $true) {
@@ -21,7 +20,7 @@ function install_app($app, $architecture, $global, $suggested, $use_cache = $tru
 
     $is_nightly = $version -eq 'nightly'
     if ($is_nightly) {
-        $version = nightly_version $(get-date)
+        $version = nightly_version
         $check_hash = $false
     }
 
@@ -660,7 +659,7 @@ function hash_for_url($manifest, $url, $arch) {
 function check_hash($file, $hash, $app_name) {
     $file = fullpath $file
     if(!$hash) {
-        warn "Warning: No hash in manifest. SHA256 for '$(fname $file)' is:`n    $(compute_hash $file 'sha256')"
+        warn "Warning: No hash in manifest. SHA256 for '$(fname $file)' is:`n    $((Get-FileHash -Path $file -Algorithm SHA256).Hash.ToLower())"
         return $true, $null
     }
 
@@ -672,7 +671,7 @@ function check_hash($file, $hash, $app_name) {
         return $false, "Hash type '$algorithm' isn't supported."
     }
 
-    $actual = compute_hash $file $algorithm
+    $actual = (Get-FileHash -Path $file -Algorithm $algorithm).Hash.ToLower()
     $expected = $expected.ToLower()
 
     if($actual -ne $expected) {
@@ -692,25 +691,6 @@ function check_hash($file, $hash, $app_name) {
     return $true, $null
 }
 
-function compute_hash($file, $algname) {
-    try {
-        if(Test-CommandAvailable Get-FileHash) {
-            return (Get-FileHash -Path $file -Algorithm $algname).Hash.ToLower()
-        } else {
-            $fs = [system.io.file]::openread($file)
-            $alg = [system.security.cryptography.hashalgorithm]::create($algname)
-            $hexbytes = $alg.computehash($fs) | ForEach-Object { $_.tostring('x2') }
-            return [string]::join('', $hexbytes)
-        }
-    } catch {
-        error $_.exception.message
-    } finally {
-        if($fs) { $fs.dispose() }
-        if($alg) { $alg.dispose() }
-    }
-    return ''
-}
-
 # for dealing with installers
 function args($config, $dir, $global) {
     if($config) { return $config | ForEach-Object { (format $_ @{'dir'=$dir;'global'=$global}) } }
diff --git a/lib/unix.ps1 b/lib/unix.ps1
deleted file mode 100644
index 1a202c3eaf..0000000000
--- a/lib/unix.ps1
+++ /dev/null
@@ -1,45 +0,0 @@
-# Note: This file is for overwriting global variables and functions to make
-#       them unix compatible. It has to be imported after everything else!
-
-function is_unix() { $PSVersionTable.Platform -eq 'Unix' }
-function is_mac() { $PSVersionTable.OS.ToLower().StartsWith('darwin') }
-function is_linux() { $PSVersionTable.OS.ToLower().StartsWith('linux') }
-
-if(!(is_unix)) {
-    return # get the hell outta here
-}
-
-# core.ps1
-$scoopdir = $env:SCOOP, (get_config ROOT_PATH), (Join-Path $env:HOME 'scoop') | Select-Object -First 1
-$globaldir = $env:SCOOP_GLOBAL, (get_config 'GLOBAL_PATH'), '/usr/local/scoop' | Select-Object -First 1
-$cachedir = $env:SCOOP_CACHE, (get_config 'CACHE_PATH'), (Join-Path $scoopdir 'cache') | Select-Object -First 1
-
-# core.ps1
-function ensure($dir) {
-    mkdir -p $dir > $null
-    return Convert-Path $dir
-}
-
-# install.ps1
-function compute_hash($file, $algname) {
-    if(is_mac) {
-        switch ($algname)
-        {
-            "md5" { $result = (md5 -q $file) }
-            "sha1" { $result = (shasum -ba 1 $file) }
-            "sha256" { $result = (shasum -ba 256 $file) }
-            "sha512" { $result = (shasum -ba 512 $file) }
-            default { $result = (shasum -ba 256 $file) }
-        }
-    } else {
-        switch ($algname)
-        {
-            "md5" { $result = (md5sum -b $file) }
-            "sha1" { $result = (sha1sum -b $file) }
-            "sha256" { $result = (sha256sum -b $file) }
-            "sha512" { $result = (sha512sum -b $file) }
-            default { $result = (sha256sum -b $file) }
-        }
-    }
-    return $result.split(' ') | Select-Object -first 1
-}
diff --git a/lib/versions.ps1 b/lib/versions.ps1
index 60530ec193..6a55fb9cc0 100644
--- a/lib/versions.ps1
+++ b/lib/versions.ps1
@@ -147,9 +147,20 @@ function Compare-Version {
         $splitReferenceVersion = @(SplitVersion -Version $ReferenceVersion -Delimiter $Delimiter)
         $splitDifferenceVersion = @(SplitVersion -Version $DifferenceVersion -Delimiter $Delimiter)
 
-        # Nightly versions are always equal
+        # Nightly versions are always equal unless UPDATE_NIGHTLY is $true
         if ($splitReferenceVersion[0] -eq 'nightly' -and $splitDifferenceVersion[0] -eq 'nightly') {
-            return 0
+            if (get_config UPDATE_NIGHTLY) {
+                # nightly versions will be compared by date if UPDATE_NIGHTLY is $true
+                if ($null -eq $splitReferenceVersion[1]) {
+                    $splitReferenceVersion += Get-Date -Format 'yyyyMMdd'
+                }
+                if ($null -eq $splitDifferenceVersion[1]) {
+                    $splitDifferenceVersion += Get-Date -Format 'yyyyMMdd'
+                }
+                return [Math]::Sign($splitDifferenceVersion[1] - $splitReferenceVersion[1])
+            } else {
+                return 0
+            }
         }
 
         for ($i = 0; $i -lt [Math]::Max($splitReferenceVersion.Length, $splitDifferenceVersion.Length); $i++) {
diff --git a/libexec/scoop-cat.ps1 b/libexec/scoop-cat.ps1
index 0e420bb046..3e840c7149 100644
--- a/libexec/scoop-cat.ps1
+++ b/libexec/scoop-cat.ps1
@@ -1,5 +1,8 @@
 # Usage: scoop cat <app>
-# Summary: Show content of specified manifest. If available, `bat` will be used to pretty-print the JSON.
+# Summary: Show content of specified manifest.
+# Help: Show content of specified manifest.
+# If configured, `bat` will be used to pretty-print the JSON.
+# See `cat_style` in `scoop help config` for further information.
 
 param($app)
 
diff --git a/libexec/scoop-checkup.ps1 b/libexec/scoop-checkup.ps1
index 3c6c5f4f50..a775ec3964 100644
--- a/libexec/scoop-checkup.ps1
+++ b/libexec/scoop-checkup.ps1
@@ -17,6 +17,7 @@ if ($adminPrivileges) {
 
 $issues += !(check_main_bucket)
 $issues += !(check_long_paths)
+$issues += !(Get-WindowsDeveloperModeStatus)
 
 if (!(Test-HelperInstalled -Helper 7zip)) {
     error "'7-Zip' is not installed! It's required for unpacking most programs. Please Run 'scoop install 7zip' or 'scoop install 7zip-zstd'."
diff --git a/libexec/scoop-config.ps1 b/libexec/scoop-config.ps1
index 9395ca5f97..09487da7c5 100644
--- a/libexec/scoop-config.ps1
+++ b/libexec/scoop-config.ps1
@@ -53,7 +53,7 @@
 #
 # default_architecture: 64bit|32bit|arm64
 #       Allow to configure preferred architecture for application installation.
-#       If not specified, architecture is determined be system.
+#       If not specified, architecture is determined by system.
 #
 # debug: $true|$false
 #       Additional and detailed output will be shown.
@@ -111,6 +111,10 @@
 #       Should be in the format 'YYYY-MM-DD', 'YYYY/MM/DD' or any other forms that accepted by '[System.DateTime]::Parse()'.
 #       Ref: https://docs.microsoft.com/dotnet/api/system.datetime.parse?view=netframework-4.5#StringToParse
 #
+# update_nightly: $true|$false
+#       Nightly version is formatted as 'nightly-yyyyMMdd' and will be updated after one day if this is set to $true.
+#       Otherwise, nightly version will not be updated unless `--force` is used.
+#
 # ARIA2 configuration
 # -------------------
 #
@@ -175,7 +179,11 @@ if (!$name) {
     if($null -eq $value) {
         Write-Host "'$name' is not set"
     } else {
-        $value
+        if ($value -is [System.DateTime]) {
+            $value.ToString('o')
+        } else {
+            $value
+        }
     }
 }
 
diff --git a/libexec/scoop-download.ps1 b/libexec/scoop-download.ps1
index 66c7632c92..34de7ea19f 100644
--- a/libexec/scoop-download.ps1
+++ b/libexec/scoop-download.ps1
@@ -85,7 +85,7 @@ foreach ($curr_app in $apps) {
 
     $curr_check_hash = $check_hash
     if ($version -eq 'nightly') {
-        $version = nightly_version $(get-date)
+        $version = nightly_version
         $curr_check_hash = $false
     }
 
diff --git a/libexec/scoop-import.ps1 b/libexec/scoop-import.ps1
index 7e3ec1c52c..1221e127bf 100644
--- a/libexec/scoop-import.ps1
+++ b/libexec/scoop-import.ps1
@@ -40,12 +40,14 @@ foreach ($item in $import.apps) {
     } else {
         ''
     }
-    $arch = if ('64bit' -in $info) {
+    $arch = if ('64bit' -in $info -and '64bit' -ne $def_arch) {
         ' --arch 64bit'
-    } elseif ('32bit' -in $info) {
+    } elseif ('32bit' -in $info -and '32bit' -ne $def_arch) {
         ' --arch 32bit'
-    } else {
+    } elseif ('arm64' -in $info -and 'arm64' -ne $def_arch) {
         ' --arch arm64'
+    } else {
+        ''
     }
 
     $app = if ($item.Source -in $bucket_names) {
diff --git a/libexec/scoop-update.ps1 b/libexec/scoop-update.ps1
index 84bd448f78..ad670f86c0 100644
--- a/libexec/scoop-update.ps1
+++ b/libexec/scoop-update.ps1
@@ -202,7 +202,7 @@ function update($app, $global, $quiet = $false, $independent, $suggested, $use_c
     $version = $manifest.version
     $is_nightly = $version -eq 'nightly'
     if ($is_nightly) {
-        $version = nightly_version $(get-date) $quiet
+        $version = nightly_version $quiet
         $check_hash = $false
     }
 
diff --git a/schema.json b/schema.json
index a9c30d3b4e..239218cc23 100644
--- a/schema.json
+++ b/schema.json
@@ -248,6 +248,15 @@
                 "hash": {
                     "$ref": "#/definitions/hashExtractionOrArrayOfHashExtractions"
                 },
+                "installer": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                        "file": {
+                            "type": "string"
+                        }
+                    }
+                },
                 "license": {
                     "$ref": "#/definitions/license"
                 },
@@ -266,6 +275,9 @@
                         }
                     }
                 },
+                "shortcuts": {
+                    "$ref": "#/definitions/shortcutsArray"
+                },
                 "url": {
                     "$ref": "#/definitions/autoupdateUriOrArrayOfAutoupdateUris"
                 }
diff --git a/supporting/shimexe/build.ps1 b/supporting/shimexe/build.ps1
index 54aea9c944..bf90f720ae 100644
--- a/supporting/shimexe/build.ps1
+++ b/supporting/shimexe/build.ps1
@@ -16,7 +16,7 @@ Write-Output 'Computing checksums ...'
 Remove-Item "$PSScriptRoot\bin\checksum.sha256" -ErrorAction Ignore
 Remove-Item "$PSScriptRoot\bin\checksum.sha512" -ErrorAction Ignore
 Get-ChildItem "$PSScriptRoot\bin\*" -Include *.exe, *.dll | ForEach-Object {
-    "$(compute_hash $_ 'sha256') *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha256" -Append -Encoding oem
-    "$(compute_hash $_ 'sha512') *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha512" -Append -Encoding oem
+    "$((Get-FileHash -Path $_ -Algorithm SHA256).Hash.ToLower()) *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha256" -Append -Encoding oem
+    "$((Get-FileHash -Path $_ -Algorithm SHA512).Hash.ToLower()) *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha512" -Append -Encoding oem
 }
 Pop-Location
diff --git a/supporting/validator/build.ps1 b/supporting/validator/build.ps1
index 1fcf2c1fdc..c61db3313d 100644
--- a/supporting/validator/build.ps1
+++ b/supporting/validator/build.ps1
@@ -21,7 +21,7 @@ Write-Output 'Computing checksums ...'
 Remove-Item "$PSScriptRoot\bin\checksum.sha256" -ErrorAction Ignore
 Remove-Item "$PSScriptRoot\bin\checksum.sha512" -ErrorAction Ignore
 Get-ChildItem "$PSScriptRoot\bin\*" -Include *.exe, *.dll | ForEach-Object {
-    "$(compute_hash $_ 'sha256') *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha256" -Append -Encoding oem
-    "$(compute_hash $_ 'sha512') *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha512" -Append -Encoding oem
+    "$((Get-FileHash -Path $_ -Algorithm SHA256).Hash.ToLower()) *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha256" -Append -Encoding oem
+    "$((Get-FileHash -Path $_ -Algorithm SHA512).Hash.ToLower()) *$($_.Name)" | Out-File "$PSScriptRoot\bin\checksum.sha512" -Append -Encoding oem
 }
 Pop-Location
diff --git a/test/00-Project.Tests.ps1 b/test/00-Project.Tests.ps1
deleted file mode 100644
index c45d45c708..0000000000
--- a/test/00-Project.Tests.ps1
+++ /dev/null
@@ -1,74 +0,0 @@
-$repo_dir = (Get-Item $MyInvocation.MyCommand.Path).Directory.Parent.FullName
-
-$repo_files = @( Get-ChildItem $repo_dir -File -Recurse -Force )
-
-$project_file_exclusions = @(
-    '[\\/]\.git[\\/]',
-    '\.sublime-workspace$',
-    '\.DS_Store$',
-    'supporting(\\|/)validator(\\|/)packages(\\|/)*',
-    'supporting(\\|/)shimexe(\\|/)packages(\\|/)*'
-)
-
-Describe 'Project code' {
-
-    $files = @(
-        $repo_files |
-            Where-Object { $_.fullname -inotmatch $($project_file_exclusions -join '|') } |
-            Where-Object { $_.fullname -imatch '.(ps1|psm1)$' }
-    )
-
-    $files_exist = ($files.Count -gt 0)
-
-    It $('PowerShell code files exist ({0} found)' -f $files.Count) -Skip:$(-not $files_exist) {
-        if (-not ($files.Count -gt 0)) {
-            throw 'No PowerShell code files were found'
-        }
-    }
-
-    function Test-PowerShellSyntax {
-        # ref: http://powershell.org/wp/forums/topic/how-to-check-syntax-of-scripts-automatically @@ https://archive.is/xtSv6
-        # originally created by Alexander Petrovskiy & Dave Wyatt
-        [CmdletBinding()]
-        param (
-            [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
-            [string[]]
-            $Path
-        )
-
-        process {
-            foreach ($scriptPath in $Path) {
-                $contents = Get-Content -Path $scriptPath
-
-                if ($null -eq $contents) {
-                    continue
-                }
-
-                $errors = $null
-                $null = [System.Management.Automation.PSParser]::Tokenize($contents, [ref]$errors)
-
-                New-Object psobject -Property @{
-                    Path              = $scriptPath
-                    SyntaxErrorsFound = ($errors.Count -gt 0)
-                }
-            }
-        }
-    }
-
-    It 'PowerShell code files do not contain syntax errors' -Skip:$(-not $files_exist) {
-        $badFiles = @(
-            foreach ($file in $files) {
-                if ( (Test-PowerShellSyntax $file.FullName).SyntaxErrorsFound ) {
-                    $file.FullName
-                }
-            }
-        )
-
-        if ($badFiles.Count -gt 0) {
-            throw "The following files have syntax errors: `r`n`r`n$($badFiles -join "`r`n")"
-        }
-    }
-
-}
-
-. "$PSScriptRoot\Import-File-Tests.ps1"
diff --git a/test/Import-Bucket-Tests.ps1 b/test/Import-Bucket-Tests.ps1
index b42b3bdc7f..789a4b24f7 100644
--- a/test/Import-Bucket-Tests.ps1
+++ b/test/Import-Bucket-Tests.ps1
@@ -1,127 +1,54 @@
-#Requires -Version 5.0
-#Requires -Modules @{ ModuleName = 'Pester'; RequiredVersion = '4.10.1' }
+#Requires -Version 5.1
+#Requires -Modules @{ ModuleName = 'BuildHelpers'; ModuleVersion = '2.0.1' }
+#Requires -Modules @{ ModuleName = 'Pester'; ModuleVersion = '5.2.0' }
 param(
-    [ValidateNotNullOrEmpty()]
-    [String]
-    $repo_dir = (Split-Path -Path $MyInvocation.PSCommandPath -Parent)
+    [String] $BucketPath = $MyInvocation.PSScriptRoot
 )
 
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\manifest.ps1"
-. "$PSScriptRoot\..\lib\unix.ps1"
+. "$PSScriptRoot\Scoop-00File.Tests.ps1" -TestPath $BucketPath
 
-$bucketdir = $repo_dir
-if (Test-Path("$repo_dir\..\bucket")) {
-    $bucketdir = "$repo_dir\..\bucket"
-} elseif (Test-Path("$repo_dir\bucket")) {
-    $bucketdir = "$repo_dir\bucket"
-}
-
-# Tests for non manifest files
-$repo_files = @(Get-ChildItem -Path $repo_dir -File -Recurse)
-$project_file_exclusions = @(
-    '[\\/]\.git[\\/]',
-    '.sublime-workspace$',
-    '.DS_Store$'
-)
-. "$PSScriptRoot\Import-File-Tests.ps1"
-
-# Tests for manifest files
-Describe 'Manifest Validator' -Tag 'Validator' {
-    BeforeAll {
-        $schema = "$PSScriptRoot\..\schema.json"
-        $working_dir = setup_working 'manifest'
-        Add-Type -Path "$PSScriptRoot\..\supporting\validator\bin\Newtonsoft.Json.dll"
-        Add-Type -Path "$PSScriptRoot\..\supporting\validator\bin\Newtonsoft.Json.Schema.dll"
-        Add-Type -Path "$PSScriptRoot\..\supporting\validator\bin\Scoop.Validator.dll"
-    }
-
-    It 'Scoop.Validator is available' {
-        ([System.Management.Automation.PSTypeName]'Scoop.Validator').Type | Should -Be 'Scoop.Validator'
-    }
-
-    Context 'parse_json function' {
-        It 'fails with invalid json' {
-            { parse_json "$working_dir\broken_wget.json" } | Should -Throw
+Describe 'Manifest validates against the schema' {
+    BeforeDiscovery {
+        $bucketDir = if (Test-Path "$BucketPath\bucket") {
+            "$BucketPath\bucket"
+        } else {
+            $BucketPath
         }
-    }
-
-    Context 'schema validation' {
-        It 'fails with broken schema' {
-            $validator = New-Object Scoop.Validator("$working_dir\broken_schema.json", $true)
-            $validator.Validate("$working_dir\wget.json") | Should -BeFalse
-            $validator.Errors.Count | Should -Be 1
-            $validator.Errors | Select-Object -First 1 | Should -Match 'broken_schema.*(line 6).*(position 4)'
-        }
-        It 'fails with broken manifest' {
-            $validator = New-Object Scoop.Validator($schema, $true)
-            $validator.Validate("$working_dir\broken_wget.json") | Should -BeFalse
-            $validator.Errors.Count | Should -Be 1
-            $validator.Errors | Select-Object -First 1 | Should -Match 'broken_wget.*(line 5).*(position 4)'
+        if ($env:CI -eq $true) {
+            Set-BuildEnvironment -Force
+            $changedManifests = @(Get-GitChangedFile -Path $bucketDir -Include '*.json' -Commit $env:BHCommitHash)
         }
-        It 'fails with invalid manifest' {
-            $validator = New-Object Scoop.Validator($schema, $true)
-            $validator.Validate("$working_dir\invalid_wget.json") | Should -BeFalse
-            $validator.Errors.Count | Should -Be 16
-            $validator.Errors | Select-Object -First 1 | Should -Match "Property 'randomproperty' has not been defined and the schema does not allow additional properties\."
-            $validator.Errors | Select-Object -Last 1 | Should -Match 'Required properties are missing from object: version\.'
+        $manifestFiles = (Get-ChildItem $bucketDir -Filter '*.json' -Recurse).FullName
+        if ($changedManifests) {
+            $manifestFiles = $manifestFiles | Where-Object { $_ -in $changedManifests }
         }
     }
-}
-Describe 'manifest validates against the schema' -Tag 'Manifests' {
     BeforeAll {
-        $schema = "$PSScriptRoot\..\schema.json"
-        $changed_manifests = @()
-        if ($env:CI -eq $true) {
-            # AppVeyor
-            $commit = if ($env:APPVEYOR_PULL_REQUEST_HEAD_COMMIT) { $env:APPVEYOR_PULL_REQUEST_HEAD_COMMIT } else { $env:APPVEYOR_REPO_COMMIT }
-
-            # GitHub Actions
-            if ($env:GITHUB_SHA) {
-                $commit = $env:GITHUB_SHA
-            }
-            $changed_manifests = (Get-GitChangedFile -Path $repo_dir -Include '*.json' -Commit $commit)
-        }
-        $manifest_files = Get-ChildItem $bucketdir -Filter '*.json' -Recurse
-        $validator = New-Object Scoop.Validator($schema, $true)
+        Add-Type -Path "$PSScriptRoot\..\supporting\validator\bin\Scoop.Validator.dll"
+        # Could not use backslash '\' in Linux/macOS for .NET object 'Scoop.Validator'
+        $validator = New-Object Scoop.Validator("$PSScriptRoot/../schema.json", $true)
+        $global:quotaExceeded = $false
     }
-
-    $quota_exceeded = $false
-
-    $manifest_files | ForEach-Object {
-        $skip_manifest = ($changed_manifests -inotcontains $_.FullName)
-        if ($env:CI -ne $true -or $changed_manifests -imatch 'schema.json') {
-            $skip_manifest = $false
-        }
-        It "$_" -Skip:$skip_manifest {
+    It '<_>' -TestCases $manifestFiles {
+        if ($global:quotaExceeded) {
+            Set-ItResult -Skipped -Because 'Schema validation limit exceeded.'
+        } else {
             $file = $_ # exception handling may overwrite $_
-
-            if (!($quota_exceeded)) {
-                try {
-                    $validator.Validate($file.fullname)
-
-                    if ($validator.Errors.Count -gt 0) {
-                        Write-Host -f red "      [-] $_ has $($validator.Errors.Count) Error$(If($validator.Errors.Count -gt 1) { 's' })!"
-                        Write-Host -f yellow $validator.ErrorsAsString
-                    }
-                    $validator.Errors.Count | Should -Be 0
-                } catch {
-                    if ($_.exception.message -like '*The free-quota limit of 1000 schema validations per hour has been reached.*') {
-                        $quota_exceeded = $true
-                        Write-Host -f darkyellow 'Schema validation limit exceeded. Will skip further validations.'
-                    } else {
-                        throw
-                    }
+            try {
+                $validator.Validate($file)
+                if ($validator.Errors.Count -gt 0) {
+                    Write-Host "  [-] $_ has $($validator.Errors.Count) Error$(If($validator.Errors.Count -gt 1) { 's' })!" -ForegroundColor Red
+                    Write-Host $validator.ErrorsAsString -ForegroundColor Yellow
+                }
+                $validator.Errors.Count | Should -Be 0
+            } catch {
+                if ($_.Exception.Message -like '*The free-quota limit of 1000 schema validations per hour has been reached.*') {
+                    $global:quotaExceeded = $true
+                    Set-ItResult -Skipped -Because 'Schema validation limit exceeded.'
+                } else {
+                    throw
                 }
             }
-
-            $manifest = parse_json $file.fullname
-            $url = arch_specific 'url' $manifest '32bit'
-            $url64 = arch_specific 'url' $manifest '64bit'
-            if (!$url) {
-                $url = $url64
-            }
-            $url | Should -Not -BeNullOrEmpty
         }
     }
 }
diff --git a/test/Import-File-Tests.ps1 b/test/Import-File-Tests.ps1
deleted file mode 100644
index 5aadcd3ade..0000000000
--- a/test/Import-File-Tests.ps1
+++ /dev/null
@@ -1,134 +0,0 @@
-if ([String]::IsNullOrEmpty($MyInvocation.PSScriptRoot)) {
-    Write-Error 'This script should not be called directly! It has to be imported from a buckets test file!'
-    exit 1
-}
-
-Describe 'Style constraints for non-binary project files' {
-
-    $files = @(
-        # gather all files except '*.exe', '*.zip', or any .git repository files
-        $repo_files |
-            Where-Object { $_.fullname -inotmatch $($project_file_exclusions -join '|') } |
-            Where-Object { $_.fullname -inotmatch '(.exe|.zip|.dll)$' } |
-            Where-Object { $_.fullname -inotmatch '(unformatted)' }
-    )
-
-    $files_exist = ($files.Count -gt 0)
-
-    It $('non-binary project files exist ({0} found)' -f $files.Count) -Skip:$(-not $files_exist) {
-        if (-not ($files.Count -gt 0)) {
-            throw 'No non-binary project were found'
-        }
-    }
-
-    It 'files do not contain leading UTF-8 BOM' -Skip:$(-not $files_exist) {
-        # UTF-8 BOM == 0xEF 0xBB 0xBF
-        # see http://www.powershellmagazine.com/2012/12/17/pscxtip-how-to-determine-the-byte-order-mark-of-a-text-file @@ https://archive.is/RgT42
-        # ref: http://poshcode.org/2153 @@ https://archive.is/sGnnu
-        $badFiles = @(
-            foreach ($file in $files) {
-                if ((Get-Command Get-Content).parameters.ContainsKey('AsByteStream')) {
-                    # PowerShell Core (6.0+) '-Encoding byte' is replaced by '-AsByteStream'
-                    $content = ([char[]](Get-Content $file.FullName -AsByteStream -TotalCount 3) -join '')
-                } else {
-                    $content = ([char[]](Get-Content $file.FullName -Encoding byte -TotalCount 3) -join '')
-                }
-                if ([regex]::match($content, '(?ms)^\xEF\xBB\xBF').success) {
-                    $file.FullName
-                }
-            }
-        )
-
-        if ($badFiles.Count -gt 0) {
-            throw "The following files have utf-8 BOM: `r`n`r`n$($badFiles -join "`r`n")"
-        }
-    }
-
-    It 'files end with a newline' -Skip:$(-not $files_exist) {
-        $badFiles = @(
-            foreach ($file in $files) {
-                # Ignore previous TestResults.xml
-                if ($file -match 'TestResults.xml') {
-                    continue
-                }
-                $string = [System.IO.File]::ReadAllText($file.FullName)
-                if ($string.Length -gt 0 -and $string[-1] -ne "`n") {
-                    $file.FullName
-                }
-            }
-        )
-
-        if ($badFiles.Count -gt 0) {
-            throw "The following files do not end with a newline: `r`n`r`n$($badFiles -join "`r`n")"
-        }
-    }
-
-    It 'file newlines are CRLF' -Skip:$(-not $files_exist) {
-        $badFiles = @(
-            foreach ($file in $files) {
-                $content = [System.IO.File]::ReadAllText($file.FullName)
-                if (!$content) {
-                    throw "File contents are null: $($file.FullName)"
-                }
-                $lines = [regex]::split($content, '\r\n')
-                $lineCount = $lines.Count
-
-                for ($i = 0; $i -lt $lineCount; $i++) {
-                    if ( [regex]::match($lines[$i], '\r|\n').success ) {
-                        $file.FullName
-                        break
-                    }
-                }
-            }
-        )
-
-        if ($badFiles.Count -gt 0) {
-            throw "The following files have non-CRLF line endings: `r`n`r`n$($badFiles -join "`r`n")"
-        }
-    }
-
-    It 'files have no lines containing trailing whitespace' -Skip:$(-not $files_exist) {
-        $badLines = @(
-            foreach ($file in $files) {
-                # Ignore previous TestResults.xml
-                if ($file -match 'TestResults.xml') {
-                    continue
-                }
-                $lines = [System.IO.File]::ReadAllLines($file.FullName)
-                $lineCount = $lines.Count
-
-                for ($i = 0; $i -lt $lineCount; $i++) {
-                    if ($lines[$i] -match '\s+$') {
-                        'File: {0}, Line: {1}' -f $file.FullName, ($i + 1)
-                    }
-                }
-            }
-        )
-
-        if ($badLines.Count -gt 0) {
-            throw "The following $($badLines.Count) lines contain trailing whitespace: `r`n`r`n$($badLines -join "`r`n")"
-        }
-    }
-
-    It 'any leading whitespace consists only of spaces (excepting makefiles)' -Skip:$(-not $files_exist) {
-        $badLines = @(
-            foreach ($file in $files) {
-                if ($file.fullname -inotmatch '(^|.)makefile$') {
-                    $lines = [System.IO.File]::ReadAllLines($file.FullName)
-                    $lineCount = $lines.Count
-
-                    for ($i = 0; $i -lt $lineCount; $i++) {
-                        if ($lines[$i] -notmatch '^[ ]*(\S|$)') {
-                            'File: {0}, Line: {1}' -f $file.FullName, ($i + 1)
-                        }
-                    }
-                }
-            }
-        )
-
-        if ($badLines.Count -gt 0) {
-            throw "The following $($badLines.Count) lines contain TABs within leading whitespace: `r`n`r`n$($badLines -join "`r`n")"
-        }
-    }
-
-}
diff --git a/test/Scoop-00File.Tests.ps1 b/test/Scoop-00File.Tests.ps1
new file mode 100644
index 0000000000..4161c37792
--- /dev/null
+++ b/test/Scoop-00File.Tests.ps1
@@ -0,0 +1,189 @@
+param(
+    [String] $TestPath = "$PSScriptRoot\.."
+)
+
+BeforeDiscovery {
+    $project_file_exclusions = @(
+        '[\\/]\.git[\\/]',
+        '\.sublime-workspace$',
+        '\.DS_Store$',
+        'supporting(\\|/)validator(\\|/)packages(\\|/)*',
+        'supporting(\\|/)shimexe(\\|/)packages(\\|/)*'
+    )
+    $repo_files = (Get-ChildItem $TestPath -File -Recurse).FullName |
+        Where-Object { $_ -inotmatch $($project_file_exclusions -join '|') }
+}
+
+Describe 'Code Syntax' -ForEach @(, $repo_files) -Tag 'File' {
+    BeforeAll {
+        $files = @(
+            $_ | Where-Object { $_ -imatch '.(ps1|psm1)$' }
+        )
+        function Test-PowerShellSyntax {
+            # ref: http://powershell.org/wp/forums/topic/how-to-check-syntax-of-scripts-automatically @@ https://archive.is/xtSv6
+            # originally created by Alexander Petrovskiy & Dave Wyatt
+            [CmdletBinding()]
+            param (
+                [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
+                [string[]]
+                $Path
+            )
+
+            process {
+                foreach ($scriptPath in $Path) {
+                    $contents = Get-Content -Path $scriptPath
+
+                    if ($null -eq $contents) {
+                        continue
+                    }
+
+                    $errors = $null
+                    $null = [System.Management.Automation.PSParser]::Tokenize($contents, [ref]$errors)
+
+                    New-Object psobject -Property @{
+                        Path              = $scriptPath
+                        SyntaxErrorsFound = ($errors.Count -gt 0)
+                    }
+                }
+            }
+        }
+
+    }
+
+    It 'PowerShell code files do not contain syntax errors' {
+        $badFiles = @(
+            foreach ($file in $files) {
+                if ( (Test-PowerShellSyntax $file).SyntaxErrorsFound ) {
+                    $file
+                }
+            }
+        )
+
+        if ($badFiles.Count -gt 0) {
+            throw "The following files have syntax errors: `r`n`r`n$($badFiles -join "`r`n")"
+        }
+    }
+
+}
+
+Describe 'Style constraints for non-binary project files' -ForEach @(, $repo_files) -Tag 'File' {
+    BeforeAll {
+        $files = @(
+            # gather all files except '*.exe', '*.zip', or any .git repository files
+            $_ |
+                Where-Object { $_ -inotmatch '(.exe|.zip|.dll)$' } |
+                Where-Object { $_ -inotmatch '(unformatted)' }
+        )
+    }
+
+    It 'files do not contain leading UTF-8 BOM' {
+        # UTF-8 BOM == 0xEF 0xBB 0xBF
+        # see http://www.powershellmagazine.com/2012/12/17/pscxtip-how-to-determine-the-byte-order-mark-of-a-text-file @@ https://archive.is/RgT42
+        # ref: http://poshcode.org/2153 @@ https://archive.is/sGnnu
+        $badFiles = @(
+            foreach ($file in $files) {
+                if ((Get-Command Get-Content).parameters.ContainsKey('AsByteStream')) {
+                    # PowerShell Core (6.0+) '-Encoding byte' is replaced by '-AsByteStream'
+                    $content = ([char[]](Get-Content $file -AsByteStream -TotalCount 3) -join '')
+                } else {
+                    $content = ([char[]](Get-Content $file -Encoding byte -TotalCount 3) -join '')
+                }
+                if ([regex]::match($content, '(?ms)^\xEF\xBB\xBF').success) {
+                    $file
+                }
+            }
+        )
+
+        if ($badFiles.Count -gt 0) {
+            throw "The following files have utf-8 BOM: `r`n`r`n$($badFiles -join "`r`n")"
+        }
+    }
+
+    It 'files end with a newline' {
+        $badFiles = @(
+            foreach ($file in $files) {
+                # Ignore previous TestResults.xml
+                if ($file -match 'TestResults.xml') {
+                    continue
+                }
+                $string = [System.IO.File]::ReadAllText($file)
+                if ($string.Length -gt 0 -and $string[-1] -ne "`n") {
+                    $file
+                }
+            }
+        )
+
+        if ($badFiles.Count -gt 0) {
+            throw "The following files do not end with a newline: `r`n`r`n$($badFiles -join "`r`n")"
+        }
+    }
+
+    It 'file newlines are CRLF' {
+        $badFiles = @(
+            foreach ($file in $files) {
+                $content = [System.IO.File]::ReadAllText($file)
+                if (!$content) {
+                    throw "File contents are null: $($file)"
+                }
+                $lines = [regex]::split($content, '\r\n')
+                $lineCount = $lines.Count
+
+                for ($i = 0; $i -lt $lineCount; $i++) {
+                    if ( [regex]::match($lines[$i], '\r|\n').success ) {
+                        $file
+                        break
+                    }
+                }
+            }
+        )
+
+        if ($badFiles.Count -gt 0) {
+            throw "The following files have non-CRLF line endings: `r`n`r`n$($badFiles -join "`r`n")"
+        }
+    }
+
+    It 'files have no lines containing trailing whitespace' {
+        $badLines = @(
+            foreach ($file in $files) {
+                # Ignore previous TestResults.xml
+                if ($file -match 'TestResults.xml') {
+                    continue
+                }
+                $lines = [System.IO.File]::ReadAllLines($file)
+                $lineCount = $lines.Count
+
+                for ($i = 0; $i -lt $lineCount; $i++) {
+                    if ($lines[$i] -match '\s+$') {
+                        'File: {0}, Line: {1}' -f $file, ($i + 1)
+                    }
+                }
+            }
+        )
+
+        if ($badLines.Count -gt 0) {
+            throw "The following $($badLines.Count) lines contain trailing whitespace: `r`n`r`n$($badLines -join "`r`n")"
+        }
+    }
+
+    It 'any leading whitespace consists only of spaces (excepting makefiles)' {
+        $badLines = @(
+            foreach ($file in $files) {
+                if ($file -inotmatch '(^|.)makefile$') {
+                    $lines = [System.IO.File]::ReadAllLines($file)
+                    $lineCount = $lines.Count
+
+                    for ($i = 0; $i -lt $lineCount; $i++) {
+                        if ($lines[$i] -notmatch '^[ ]*(\S|$)') {
+                            'File: {0}, Line: {1}' -f $file, ($i + 1)
+                        }
+                    }
+                }
+            }
+        )
+
+        if ($badLines.Count -gt 0) {
+            throw "The following $($badLines.Count) lines contain TABs within leading whitespace: `r`n`r`n$($badLines -join "`r`n")"
+        }
+    }
+
+}
diff --git a/test/Scoop-00Linting.Tests.ps1 b/test/Scoop-00Linting.Tests.ps1
new file mode 100644
index 0000000000..45fbf3611c
--- /dev/null
+++ b/test/Scoop-00Linting.Tests.ps1
@@ -0,0 +1,33 @@
+Describe 'PSScriptAnalyzer' -Tag 'Linter' {
+    BeforeDiscovery {
+        $scriptDir = @('.', 'bin', 'lib', 'libexec', 'test')
+    }
+
+    BeforeAll {
+        $lintSettings = "$PSScriptRoot\..\PSScriptAnalyzerSettings.psd1"
+    }
+
+    It 'PSScriptAnalyzerSettings.ps1 should exist' {
+        $lintSettings | Should -Exist
+    }
+
+    Context 'Linting all *.psd1, *.psm1 and *.ps1 files' {
+        BeforeEach {
+            $analysis = Invoke-ScriptAnalyzer -Path "$PSScriptRoot\..\$_" -Settings $lintSettings
+        }
+        It 'Should pass: <_>' -TestCases $scriptDir {
+            $analysis | Should -HaveCount 0
+            if ($analysis) {
+                foreach ($result in $analysis) {
+                    switch -wildCard ($result.ScriptName) {
+                        '*.psm1' { $type = 'Module' }
+                        '*.ps1' { $type = 'Script' }
+                        '*.psd1' { $type = 'Manifest' }
+                    }
+                    Write-Warning "     [*] $($result.Severity): $($result.Message)"
+                    Write-Warning "         $($result.RuleName) in $type`: $directory\$($result.ScriptName):$($result.Line)"
+                }
+            }
+        }
+    }
+}
diff --git a/test/Scoop-Alias.Tests.ps1 b/test/Scoop-Alias.Tests.ps1
index 1f696f5a89..bd365718a8 100644
--- a/test/Scoop-Alias.Tests.ps1
+++ b/test/Scoop-Alias.Tests.ps1
@@ -1,56 +1,45 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\core.ps1"
-. "$PSScriptRoot\..\lib\help.ps1"
-. "$PSScriptRoot\..\libexec\scoop-alias.ps1" | Out-Null
-
-Describe 'add_alias' -Tag 'Scoop' {
-    Mock shimdir { "$env:TEMP\shims" }
-    Mock set_config { }
-    Mock get_config { @{} }
-
-    $shimdir = shimdir
-    ensure $shimdir
-
-    Context "alias doesn't exist" {
-        It 'creates a new alias' {
-            $alias_file = "$shimdir\scoop-rm.ps1"
-            $alias_file | Should -Not -Exist
-
-            add_alias 'rm' '"hello, world!"'
-            & $alias_file | Should -Be 'hello, world!'
-        }
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\core.ps1"
+    . "$PSScriptRoot\..\lib\help.ps1"
+    . "$PSScriptRoot\..\libexec\scoop-alias.ps1" | Out-Null
+}
+
+Describe 'Manipulate Alias' -Tag 'Scoop' {
+    BeforeAll {
+        Mock shimdir { "$TestDrive\shims" }
+        Mock set_config { }
+        Mock get_config { @{} }
+
+        $shimdir = shimdir
+        ensure $shimdir
     }
 
-    Context 'alias exists' {
-        It 'does not change existing alias' {
-            $alias_file = "$shimdir\scoop-rm.ps1"
-            New-Item $alias_file -Type File -Force
-            $alias_file | Should -Exist
+    It 'Creates a new alias if alias doesn''t exist' {
+        $alias_file = "$shimdir\scoop-rm.ps1"
+        $alias_file | Should -Not -Exist
 
-            add_alias 'rm' 'test'
-            $alias_file | Should -FileContentMatch ''
-        }
+        add_alias 'rm' '"hello, world!"'
+        & $alias_file | Should -Be 'hello, world!'
     }
-}
 
-Describe 'rm_alias' -Tag 'Scoop' {
-    Mock shimdir { "$env:TEMP\shims" }
-    Mock set_config { }
-    Mock get_config { @{} }
+    It 'Does not change existing alias if alias exists' {
+        $alias_file = "$shimdir\scoop-rm.ps1"
+        New-Item $alias_file -Type File -Force
+        $alias_file | Should -Exist
 
-    $shimdir = shimdir
-    ensure $shimdir
+        add_alias 'rm' 'test'
+        & $alias_file | Should -Not -Be 'test'
+    }
 
-    Context 'alias exists' {
-        It 'removes an existing alias' {
-            $alias_file = "$shimdir\scoop-rm.ps1"
-            add_alias 'rm' '"hello, world!"'
+    It 'Removes an existing alias' {
+        $alias_file = "$shimdir\scoop-rm.ps1"
+        add_alias 'rm' '"hello, world!"'
 
-            $alias_file | Should -Exist
-            Mock get_config { @(@{'rm' = 'scoop-rm' }) }
+        $alias_file | Should -Exist
+        Mock get_config { @(@{'rm' = 'scoop-rm' }) }
 
-            rm_alias 'rm'
-            $alias_file | Should -Not -Exist
-        }
+        rm_alias 'rm'
+        $alias_file | Should -Not -Exist
     }
 }
diff --git a/test/Scoop-Config.Tests.ps1 b/test/Scoop-Config.Tests.ps1
index 604a25b2f0..9826af82a2 100644
--- a/test/Scoop-Config.Tests.ps1
+++ b/test/Scoop-Config.Tests.ps1
@@ -1,17 +1,16 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\core.ps1"
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\core.ps1"
+}
 
 Describe 'config' -Tag 'Scoop' {
     BeforeAll {
-        $configFile = "$env:TEMP\ScoopTestFixtures\config.json"
-        if (Test-Path $configFile) {
-            Remove-Item -Path $configFile -Force
-        }
+        $configFile = [IO.Path]::GetTempFileName()
         $unicode = [Regex]::Unescape('\u4f60\u597d\u3053\u3093\u306b\u3061\u306f') # 你好こんにちは
     }
 
-    BeforeEach {
-        $scoopConfig = $null
+    AfterAll {
+        Remove-Item -Path $configFile -Force
     }
 
     It 'load_cfg should return null if config file does not exist' {
diff --git a/test/Scoop-Core.Tests.ps1 b/test/Scoop-Core.Tests.ps1
index 398cbfaad2..4c95067e23 100644
--- a/test/Scoop-Core.Tests.ps1
+++ b/test/Scoop-Core.Tests.ps1
@@ -1,10 +1,8 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\core.ps1"
-. "$PSScriptRoot\..\lib\install.ps1"
-. "$PSScriptRoot\..\lib\unix.ps1"
-
-$repo_dir = (Get-Item $MyInvocation.MyCommand.Path).directory.parent.FullName
-$isUnix = is_unix
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\core.ps1"
+    . "$PSScriptRoot\..\lib\install.ps1"
+}
 
 Describe 'Get-AppFilePath' -Tag 'Scoop' {
     BeforeAll {
@@ -128,15 +126,14 @@ Describe 'is_directory' -Tag 'Scoop' {
     }
 }
 
-Describe 'movedir' -Tag 'Scoop' {
-    $extract_dir = 'subdir'
-    $extract_to = $null
-
+Describe 'movedir' -Tag 'Scoop', 'Windows' {
     BeforeAll {
         $working_dir = setup_working 'movedir'
+        $extract_dir = 'subdir'
+        $extract_to = $null
     }
 
-    It 'moves directories with no spaces in path' -Skip:$isUnix {
+    It 'moves directories with no spaces in path' {
         $dir = "$working_dir\user"
         movedir "$dir\_tmp\$extract_dir" "$dir\$extract_to"
 
@@ -144,7 +141,7 @@ Describe 'movedir' -Tag 'Scoop' {
         "$dir\_tmp\$extract_dir" | Should -Not -Exist
     }
 
-    It 'moves directories with spaces in path' -Skip:$isUnix {
+    It 'moves directories with spaces in path' {
         $dir = "$working_dir\user with space"
         movedir "$dir\_tmp\$extract_dir" "$dir\$extract_to"
 
@@ -157,7 +154,7 @@ Describe 'movedir' -Tag 'Scoop' {
         "$dir\_tmp" | Should -Not -Exist
     }
 
-    It 'moves directories with quotes in path' -Skip:$isUnix {
+    It 'moves directories with quotes in path' {
         $dir = "$working_dir\user with 'quote"
         movedir "$dir\_tmp\$extract_dir" "$dir\$extract_to"
 
@@ -166,14 +163,14 @@ Describe 'movedir' -Tag 'Scoop' {
     }
 }
 
-Describe 'shim' -Tag 'Scoop' {
+Describe 'shim' -Tag 'Scoop', 'Windows' {
     BeforeAll {
         $working_dir = setup_working 'shim'
         $shimdir = shimdir
         $(ensure_in_path $shimdir) | Out-Null
     }
 
-    It "links a file onto the user's path" -Skip:$isUnix {
+    It "links a file onto the user's path" {
         { Get-Command 'shim-test' -ea stop } | Should -Throw
         { Get-Command 'shim-test.ps1' -ea stop } | Should -Throw
         { Get-Command 'shim-test.cmd' -ea stop } | Should -Throw
@@ -186,15 +183,13 @@ Describe 'shim' -Tag 'Scoop' {
         shim-test | Should -Be 'Hello, world!'
     }
 
-    Context 'user with quote' {
-        It 'shims a file with quote in path' -Skip:$isUnix {
-            { Get-Command 'shim-test' -ea stop } | Should -Throw
-            { shim-test } | Should -Throw
+    It 'shims a file with quote in path' {
+        { Get-Command 'shim-test' -ea stop } | Should -Throw
+        { shim-test } | Should -Throw
 
-            shim "$working_dir\user with 'quote\shim-test.ps1" $false 'shim-test'
-            { Get-Command 'shim-test' -ea stop } | Should -Not -Throw
-            shim-test | Should -Be 'Hello, world!'
-        }
+        shim "$working_dir\user with 'quote\shim-test.ps1" $false 'shim-test'
+        { Get-Command 'shim-test' -ea stop } | Should -Not -Throw
+        shim-test | Should -Be 'Hello, world!'
     }
 
     AfterEach {
@@ -202,14 +197,14 @@ Describe 'shim' -Tag 'Scoop' {
     }
 }
 
-Describe 'rm_shim' -Tag 'Scoop' {
+Describe 'rm_shim' -Tag 'Scoop', 'Windows' {
     BeforeAll {
         $working_dir = setup_working 'shim'
         $shimdir = shimdir
         $(ensure_in_path $shimdir) | Out-Null
     }
 
-    It 'removes shim from path' -Skip:$isUnix {
+    It 'removes shim from path' {
         shim "$working_dir\shim-test.ps1" $false 'shim-test'
 
         rm_shim 'shim-test' $shimdir
@@ -221,7 +216,7 @@ Describe 'rm_shim' -Tag 'Scoop' {
     }
 }
 
-Describe 'get_app_name_from_shim' -Tag 'Scoop' {
+Describe 'get_app_name_from_shim' -Tag 'Scoop', 'Windows' {
     BeforeAll {
         $working_dir = setup_working 'shim'
         $shimdir = shimdir
@@ -229,11 +224,11 @@ Describe 'get_app_name_from_shim' -Tag 'Scoop' {
         Mock appsdir { $working_dir }
     }
 
-    It 'returns empty string if file does not exist' -Skip:$isUnix {
+    It 'returns empty string if file does not exist' {
         get_app_name_from_shim 'non-existent-file' | Should -Be ''
     }
 
-    It 'returns app name if file exists and is a shim to an app' -Skip:$isUnix {
+    It 'returns app name if file exists and is a shim to an app' {
         ensure "$working_dir/mockapp/current/"
         Write-Output '' | Out-File "$working_dir/mockapp/current/mockapp1.ps1"
         shim "$working_dir/mockapp/current/mockapp1.ps1" $false 'shim-test1'
@@ -246,7 +241,7 @@ Describe 'get_app_name_from_shim' -Tag 'Scoop' {
         get_app_name_from_shim "$shim_path2" | Should -Be 'mockapp'
     }
 
-    It 'returns empty string if file exists and is not a shim' -Skip:$isUnix {
+    It 'returns empty string if file exists and is not a shim' {
         Write-Output 'lorem ipsum' | Out-File -Encoding ascii "$working_dir/mock-shim.ps1"
         get_app_name_from_shim "$working_dir/mock-shim.ps1" | Should -Be ''
     }
@@ -263,35 +258,33 @@ Describe 'get_app_name_from_shim' -Tag 'Scoop' {
     }
 }
 
-Describe 'ensure_robocopy_in_path' -Tag 'Scoop' {
-    $shimdir = shimdir $false
-    Mock versiondir { $repo_dir }
+Describe 'ensure_robocopy_in_path' -Tag 'Scoop', 'Windows' {
+    BeforeAll {
+        $shimdir = shimdir $false
+        Mock versiondir { "$PSScriptRoot\.." }
+    }
 
-    Context 'robocopy is not in path' {
-        It 'shims robocopy when not on path' -Skip:$isUnix {
-            Mock Test-CommandAvailable { $false }
-            Test-CommandAvailable robocopy | Should -Be $false
+    It 'shims robocopy when not on path' {
+        Mock Test-CommandAvailable { $false }
+        Test-CommandAvailable robocopy | Should -Be $false
 
-            ensure_robocopy_in_path
+        ensure_robocopy_in_path
 
-            # "$shimdir/robocopy.ps1" | should -exist
-            "$shimdir/robocopy.exe" | Should -Exist
+        # "$shimdir/robocopy.ps1" | should -exist
+        "$shimdir/robocopy.exe" | Should -Exist
 
-            # clean up
-            rm_shim robocopy $(shimdir $false) | Out-Null
-        }
+        # clean up
+        rm_shim robocopy $(shimdir $false) | Out-Null
     }
 
-    Context 'robocopy is in path' {
-        It 'does not shim robocopy when it is in path' -Skip:$isUnix {
-            Mock Test-CommandAvailable { $true }
-            Test-CommandAvailable robocopy | Should -Be $true
+    It 'does not shim robocopy when it is in path' {
+        Mock Test-CommandAvailable { $true }
+        Test-CommandAvailable robocopy | Should -Be $true
 
-            ensure_robocopy_in_path
+        ensure_robocopy_in_path
 
-            # "$shimdir/robocopy.ps1" | should -not -exist
-            "$shimdir/robocopy.exe" | Should -Not -Exist
-        }
+        # "$shimdir/robocopy.ps1" | should -not -exist
+        "$shimdir/robocopy.exe" | Should -Not -Exist
     }
 }
 
diff --git a/test/Scoop-Decompress.Tests.ps1 b/test/Scoop-Decompress.Tests.ps1
index b568ef8e56..b4cc1ef2d1 100644
--- a/test/Scoop-Decompress.Tests.ps1
+++ b/test/Scoop-Decompress.Tests.ps1
@@ -1,14 +1,13 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\core.ps1"
-. "$PSScriptRoot\..\lib\decompress.ps1"
-. "$PSScriptRoot\..\lib\install.ps1"
-. "$PSScriptRoot\..\lib\manifest.ps1"
-. "$PSScriptRoot\..\lib\versions.ps1"
-. "$PSScriptRoot\..\lib\unix.ps1"
-
-$isUnix = is_unix
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\core.ps1"
+    . "$PSScriptRoot\..\lib\decompress.ps1"
+    . "$PSScriptRoot\..\lib\install.ps1"
+    . "$PSScriptRoot\..\lib\manifest.ps1"
+    . "$PSScriptRoot\..\lib\versions.ps1"
+}
 
-Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
+Describe 'Decompression function' -Tag 'Scoop', 'Windows', 'Decompress' {
 
     BeforeAll {
         $working_dir = setup_working 'decompress'
@@ -19,13 +18,17 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             return $to
         }
 
-        It 'Decompression test cases should exist' {
+    }
+    Context 'Decompression test cases should exist' {
+        BeforeAll {
             $testcases = "$working_dir\TestCases.zip"
+        }
+        It 'Test cases should exist and hash should match' {
             $testcases | Should -Exist
-            compute_hash $testcases 'sha256' | Should -Be '791bfce192917a2ff225dcdd87d23ae5f720b20178d85e68e4b1b56139cf8e6a'
-            if (!$isUnix) {
-                Microsoft.PowerShell.Archive\Expand-Archive $testcases $working_dir
-            }
+            (Get-FileHash -Path $testcases -Algorithm SHA256).Hash.ToLower() | Should -Be '791bfce192917a2ff225dcdd87d23ae5f720b20178d85e68e4b1b56139cf8e6a'
+        }
+        It 'Test cases should be extracted correctly' {
+            { Microsoft.PowerShell.Archive\Expand-Archive -Path $testcases -DestinationPath $working_dir } | Should -Not -Throw
         }
     }
 
@@ -49,14 +52,14 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             $test6_3 = "$working_dir\7ZipTest6.part03.rar"
         }
 
-        It 'extract normal compressed file' -Skip:$isUnix {
+        It 'extract normal compressed file' {
             $to = test_extract 'Expand-7zipArchive' $test1
             $to | Should -Exist
             "$to\empty" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'extract nested compressed file' -Skip:$isUnix {
+        It 'extract nested compressed file' {
             # file ext: tgz
             $to = test_extract 'Expand-7zipArchive' $test2
             $to | Should -Exist
@@ -70,28 +73,28 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'extract nested compressed file with different inner name' -Skip:$isUnix {
+        It 'extract nested compressed file with different inner name' {
             $to = test_extract 'Expand-7zipArchive' $test4
             $to | Should -Exist
             "$to\empty" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'extract splited 7z archives (.001, .002, ...)' -Skip:$isUnix {
+        It 'extract splited 7z archives (.001, .002, ...)' {
             $to = test_extract 'Expand-7zipArchive' $test5_1
             $to | Should -Exist
             "$to\empty" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'extract splited RAR archives (.part01.rar, .part02.rar, ...)' -Skip:$isUnix {
+        It 'extract splited RAR archives (.part01.rar, .part02.rar, ...)' {
             $to = test_extract 'Expand-7zipArchive' $test6_1
             $to | Should -Exist
             "$to\dummy" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'works with "-Removal" switch ($removal param)' -Skip:$isUnix {
+        It 'works with "-Removal" switch ($removal param)' {
             $test1 | Should -Exist
             test_extract 'Expand-7zipArchive' $test1 $true
             $test1 | Should -Not -Exist
@@ -126,21 +129,21 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             $test2 = "$working_dir\ZstdTest.tar.zst"
         }
 
-        It 'extract normal compressed file' -Skip:$isUnix {
+        It 'extract normal compressed file' {
             $to = test_extract 'Expand-ZstdArchive' $test1
             $to | Should -Exist
             "$to\ZstdTest" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'extract nested compressed file' -Skip:$isUnix {
+        It 'extract nested compressed file' {
             $to = test_extract 'Expand-ZstdArchive' $test2
             $to | Should -Exist
             "$to\ZstdTest" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'works with "-Removal" switch ($removal param)' -Skip:$isUnix {
+        It 'works with "-Removal" switch ($removal param)' {
             $test1 | Should -Exist
             test_extract 'Expand-ZstdArchive' $test1 $true
             $test1 | Should -Not -Exist
@@ -159,7 +162,7 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             $test2 = "$working_dir\MSITestNull.msi"
         }
 
-        It 'extract normal MSI file' -Skip:$isUnix {
+        It 'extract normal MSI file' {
             Mock get_config { $false }
             $to = test_extract 'Expand-MsiArchive' $test1
             $to | Should -Exist
@@ -167,13 +170,13 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             (Get-ChildItem "$to\MSITest").Count | Should -Be 1
         }
 
-        It 'extract empty MSI file using lessmsi' -Skip:$isUnix {
+        It 'extract empty MSI file using lessmsi' {
             Mock get_config { $true }
             $to = test_extract 'Expand-MsiArchive' $test2
             $to | Should -Exist
         }
 
-        It 'works with "-Removal" switch ($removal param)' -Skip:$isUnix {
+        It 'works with "-Removal" switch ($removal param)' {
             Mock get_config { $false }
             $test1 | Should -Exist
             test_extract 'Expand-MsiArchive' $test1 $true
@@ -192,14 +195,14 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             $test = "$working_dir\InnoTest.exe"
         }
 
-        It 'extract Inno Setup file' -Skip:$isUnix {
+        It 'extract Inno Setup file' {
             $to = test_extract 'Expand-InnoArchive' $test
             $to | Should -Exist
             "$to\empty" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'works with "-Removal" switch ($removal param)' -Skip:$isUnix {
+        It 'works with "-Removal" switch ($removal param)' {
             $test | Should -Exist
             test_extract 'Expand-InnoArchive' $test $true
             $test | Should -Not -Exist
@@ -212,14 +215,14 @@ Describe 'Decompression function' -Tag 'Scoop', 'Decompress' {
             $test = "$working_dir\ZipTest.zip"
         }
 
-        It 'extract compressed file' -Skip:$isUnix {
+        It 'extract compressed file' {
             $to = test_extract 'Expand-ZipArchive' $test
             $to | Should -Exist
             "$to\empty" | Should -Exist
             (Get-ChildItem $to).Count | Should -Be 1
         }
 
-        It 'works with "-Removal" switch ($removal param)' -Skip:$isUnix {
+        It 'works with "-Removal" switch ($removal param)' {
             $test | Should -Exist
             test_extract 'Expand-ZipArchive' $test $true
             $test | Should -Not -Exist
diff --git a/test/Scoop-Depends.Tests.ps1 b/test/Scoop-Depends.Tests.ps1
index b465d28220..d80d7d2652 100644
--- a/test/Scoop-Depends.Tests.ps1
+++ b/test/Scoop-Depends.Tests.ps1
@@ -1,9 +1,11 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\core.ps1"
-. "$PSScriptRoot\..\lib\depends.ps1"
-. "$PSScriptRoot\..\lib\buckets.ps1"
-. "$PSScriptRoot\..\lib\install.ps1"
-. "$PSScriptRoot\..\lib\manifest.ps1"
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\core.ps1"
+    . "$PSScriptRoot\..\lib\depends.ps1"
+    . "$PSScriptRoot\..\lib\buckets.ps1"
+    . "$PSScriptRoot\..\lib\install.ps1"
+    . "$PSScriptRoot\..\lib\manifest.ps1"
+}
 
 Describe 'Package Dependencies' -Tag 'Scoop' {
     Context 'Requirement function' {
diff --git a/test/Scoop-GetOpts.Tests.ps1 b/test/Scoop-GetOpts.Tests.ps1
index 2fcbf56fe6..ef4d56a950 100644
--- a/test/Scoop-GetOpts.Tests.ps1
+++ b/test/Scoop-GetOpts.Tests.ps1
@@ -1,5 +1,7 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\getopt.ps1"
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\getopt.ps1"
+}
 
 Describe 'getopt' -Tag 'Scoop' {
     It 'handle short option with required argument missing' {
diff --git a/test/Scoop-Install.Tests.ps1 b/test/Scoop-Install.Tests.ps1
index 3559ac89e8..bafdfbe847 100644
--- a/test/Scoop-Install.Tests.ps1
+++ b/test/Scoop-Install.Tests.ps1
@@ -1,10 +1,9 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\core.ps1"
-. "$PSScriptRoot\..\lib\manifest.ps1"
-. "$PSScriptRoot\..\lib\install.ps1"
-. "$PSScriptRoot\..\lib\unix.ps1"
-
-$isUnix = is_unix
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\core.ps1"
+    . "$PSScriptRoot\..\lib\manifest.ps1"
+    . "$PSScriptRoot\..\lib\install.ps1"
+}
 
 Describe 'appname_from_url' -Tag 'Scoop' {
     It 'should extract the correct name' {
@@ -34,8 +33,8 @@ Describe 'url_remote_filename' -Tag 'Scoop' {
     }
 }
 
-Describe 'is_in_dir' -Tag 'Scoop' {
-    It 'should work correctly' -Skip:$isUnix {
+Describe 'is_in_dir' -Tag 'Scoop', 'Windows' {
+    It 'should work correctly' {
         is_in_dir 'C:\test' 'C:\foo' | Should -BeFalse
         is_in_dir 'C:\test' 'C:\test\foo\baz.zip' | Should -BeTrue
 
@@ -44,18 +43,20 @@ Describe 'is_in_dir' -Tag 'Scoop' {
     }
 }
 
-Describe 'env add and remove path' -Tag 'Scoop' {
-    # test data
-    $manifest = @{
-        'env_add_path' = @('foo', 'bar')
-    }
-    $testdir = Join-Path $PSScriptRoot 'path-test-directory'
-    $global = $false
+Describe 'env add and remove path' -Tag 'Scoop', 'Windows' {
+    BeforeAll {
+        # test data
+        $manifest = @{
+            'env_add_path' = @('foo', 'bar')
+        }
+        $testdir = Join-Path $PSScriptRoot 'path-test-directory'
+        $global = $false
 
-    # store the original path to prevent leakage of tests
-    $origPath = $env:PATH
+        # store the original path to prevent leakage of tests
+        $origPath = $env:PATH
+    }
 
-    It 'should concat the correct path' -Skip:$isUnix {
+    It 'should concat the correct path' {
         Mock add_first_in_path {}
         Mock remove_from_path {}
 
@@ -121,37 +122,3 @@ Describe 'persist_def' -Tag 'Scoop' {
         $target | Should -Be 'foo'
     }
 }
-
-Describe 'compute_hash' -Tag 'Scoop' {
-    BeforeAll {
-        $working_dir = setup_working 'manifest'
-    }
-
-    It 'computes MD5 correctly' {
-        compute_hash (Join-Path "$working_dir" 'invalid_wget.json') 'md5' | Should -Be 'cf229eecc201063e32b436e73b71deba'
-        compute_hash (Join-Path "$working_dir" 'wget.json') 'md5' | Should -Be '57c397fd5092cbd6a8b4df56be2551ab'
-        compute_hash (Join-Path "$working_dir" 'broken_schema.json') 'md5' | Should -Be '0427c7f4edc33d6d336db98fc160beb0'
-        compute_hash (Join-Path "$working_dir" 'broken_wget.json') 'md5' | Should -Be '30a7d4d3f64cb7a800d96c0f2ccec87f'
-    }
-
-    It 'computes SHA-1 correctly' {
-        compute_hash (Join-Path "$working_dir" 'invalid_wget.json') 'sha1' | Should -Be '33ae44df8feed86cdc8f544234029fb28280c3c5'
-        compute_hash (Join-Path "$working_dir" 'wget.json') 'sha1' | Should -Be '98bfacb887da8cd05d3a1162f89d90173294be55'
-        compute_hash (Join-Path "$working_dir" 'broken_schema.json') 'sha1' | Should -Be '6dcd64f8ce7a3ae6bbc3dc2288b7cb202dbfa3c8'
-        compute_hash (Join-Path "$working_dir" 'broken_wget.json') 'sha1' | Should -Be '60b5b1d5bcb4193d19aeab265eab0bb9b0c46c8f'
-    }
-
-    It 'computes SHA-256 correctly' {
-        compute_hash (Join-Path "$working_dir" 'invalid_wget.json') 'sha256' | Should -Be '1a92ef57c5f3cecba74015ae8e92fc3f2dbe141f9d171c3a06f98645a522d58c'
-        compute_hash (Join-Path "$working_dir" 'wget.json') 'sha256' | Should -Be '31d6d0953d4e95f0a42080acd61a8c2f92bc90cae324c0d6d2301a974c15f62f'
-        compute_hash (Join-Path "$working_dir" 'broken_schema.json') 'sha256' | Should -Be 'f3e5082e366006c317d9426e590623254cb1ce23d4f70165afed340b03ce333b'
-        compute_hash (Join-Path "$working_dir" 'broken_wget.json') 'sha256' | Should -Be 'da658987c3902658c6e754bfa6546dfd084aaa2c3ae25f1fd8aa4645bc9cae24'
-    }
-
-    It 'computes SHA-512 correctly' {
-        compute_hash (Join-Path "$working_dir" 'invalid_wget.json') 'sha512' | Should -Be '7a7b82ec17547f5ec13dc614a8cec919e897e6c344a6ce7d71205d6f1c3aed276c7b15cbc69acac8207f72417993299cef36884e1915d56758ea09efa2259870'
-        compute_hash (Join-Path "$working_dir" 'wget.json') 'sha512' | Should -Be '216ebf07bb77062b51420f0f5eb6b7a94d9623d1d41d36c833436058f41e39898f2aa48d7020711c0d8765d02b87ac2e6810f3f502636a6e6f47dc4b9aa02d17'
-        compute_hash (Join-Path "$working_dir" 'broken_schema.json') 'sha512' | Should -Be '8d3f5617517e61c33275eafea4b166f0a245ec229c40dea436173c354786bad72e4fd9d662f6ac2b9f3dd375c00815a07f10e12975eec1b12da7ba7db10f9c14'
-        compute_hash (Join-Path "$working_dir" 'broken_wget.json') 'sha512' | Should -Be '7b16a714491e91cc6daa5f90e700547fac4d62e1fcec8c4b78f5a2386e04e68a8ed68f27503ece9555904a047df8050b3f12b4f779c05b1e4d0156e6e2d8fdbb'
-    }
-}
diff --git a/test/Scoop-Linting.Tests.ps1 b/test/Scoop-Linting.Tests.ps1
deleted file mode 100644
index 02cc2d93c2..0000000000
--- a/test/Scoop-Linting.Tests.ps1
+++ /dev/null
@@ -1,41 +0,0 @@
-$repo_dir = (Get-Item $MyInvocation.MyCommand.Path).directory.parent.FullName
-
-Describe 'PSScriptAnalyzer' -Tag 'Linter' {
-    $scoop_modules = Get-ChildItem $repo_dir -Recurse -Include *.psd1, *.psm1, *.ps1
-    $scoop_modules = $scoop_modules | Where-Object { $_.DirectoryName -notlike '*\supporting*' -and $_.DirectoryName -notlike '*\test*' }
-    $scoop_modules = $scoop_modules | Select-Object -ExpandProperty Directory -Unique
-
-    Context 'Checking ScriptAnalyzer' {
-        It 'Invoke-ScriptAnalyzer Cmdlet should exist' {
-            { Get-Command Invoke-ScriptAnalyzer -ErrorAction Stop } | Should -Not -Throw
-        }
-        It 'PSScriptAnalyzerSettings.ps1 should exist' {
-            Test-Path "$repo_dir\PSScriptAnalyzerSettings.psd1" | Should -BeTrue
-        }
-        It 'There should be files to test' {
-            $scoop_modules.Count | Should -Not -Be 0
-        }
-    }
-
-    $linting_settings = Get-Item -Path "$repo_dir\PSScriptAnalyzerSettings.psd1"
-
-    Context 'Linting all *.psd1, *.psm1 and *.ps1 files' {
-        foreach ($directory in $scoop_modules) {
-            $analysis = Invoke-ScriptAnalyzer -Path $directory.FullName -Settings $linting_settings.FullName
-            It "Should pass: $directory" {
-                $analysis.Count | Should -Be 0
-            }
-            if ($analysis) {
-                foreach ($result in $analysis) {
-                    switch -wildCard ($result.ScriptName) {
-                        '*.psm1' { $type = 'Module' }
-                        '*.ps1' { $type = 'Script' }
-                        '*.psd1' { $type = 'Manifest' }
-                    }
-                    Write-Host -f Yellow "      [*] $($result.Severity): $($result.Message)"
-                    Write-Host -f Yellow "          $($result.RuleName) in $type`: $directory\$($result.ScriptName):$($result.Line)"
-                }
-            }
-        }
-    }
-}
diff --git a/test/Scoop-Manifest.Tests.ps1 b/test/Scoop-Manifest.Tests.ps1
index 02a24162ab..232a946bbd 100644
--- a/test/Scoop-Manifest.Tests.ps1
+++ b/test/Scoop-Manifest.Tests.ps1
@@ -1,22 +1,28 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\json.ps1"
-. "$PSScriptRoot\..\lib\manifest.ps1"
+BeforeAll {
+    . "$PSScriptRoot\..\lib\json.ps1"
+    . "$PSScriptRoot\..\lib\manifest.ps1"
+}
 
-Describe 'Pretty json formating' -Tag 'Scoop' {
-    BeforeAll {
-        $format = "$PSScriptRoot\fixtures\format"
-        $manifests = Get-ChildItem "$format\formatted" -File -Filter '*.json'
+Describe 'JSON parse and beautify' -Tag 'Scoop' {
+    Context 'Parse JSON' {
+        It 'success with valid json' {
+            { parse_json "$PSScriptRoot\fixtures\manifest\wget.json" } | Should -Not -Throw
+        }
+        It 'fails with invalid json' {
+            { parse_json "$PSScriptRoot\fixtures\manifest\broken_wget.json" } | Should -Throw
+        }
     }
-
-    Context 'Beautify manifest' {
-        $manifests | ForEach-Object {
-            if ($PSVersionTable.PSVersion.Major -gt 5) { $_ = $_.Name } # Fix for pwsh
-
-            It "$_" {
-                $pretty_json = (parse_json "$format\unformatted\$_") | ConvertToPrettyJson
-                $correct = (Get-Content "$format\formatted\$_") -join "`r`n"
-                $correct.CompareTo($pretty_json) | Should -Be 0
-            }
+    Context 'Beautify JSON' {
+        BeforeDiscovery {
+            $manifests = (Get-ChildItem "$PSScriptRoot\fixtures\format\formatted" -File -Filter '*.json').Name
+        }
+        BeforeAll {
+            $format = "$PSScriptRoot\fixtures\format"
+        }
+        It '<_>' -ForEach $manifests {
+            $pretty_json = (parse_json "$format\unformatted\$_") | ConvertToPrettyJson
+            $correct = (Get-Content "$format\formatted\$_") -join "`r`n"
+            $correct.CompareTo($pretty_json) | Should -Be 0
         }
     }
 }
@@ -47,3 +53,34 @@ Describe 'Handle ARM64 and correctly fallback' -Tag 'Scoop' {
         Get-SupportedArchitecture $manifest3 'arm64' | Should -BeNullOrEmpty
     }
 }
+
+Describe 'Manifest Validator' -Tag 'Validator' {
+    # Could not use backslash '\' in Linux/macOS for .NET object 'Scoop.Validator'
+    BeforeAll {
+        Add-Type -Path "$PSScriptRoot\..\supporting\validator\bin\Scoop.Validator.dll"
+        $schema = "$PSScriptRoot/../schema.json"
+    }
+
+    It 'Scoop.Validator is available' {
+            ([System.Management.Automation.PSTypeName]'Scoop.Validator').Type | Should -Be 'Scoop.Validator'
+    }
+    It 'fails with broken schema' {
+        $validator = New-Object Scoop.Validator("$PSScriptRoot/fixtures/manifest/broken_schema.json", $true)
+        $validator.Validate("$PSScriptRoot/fixtures/manifest/wget.json") | Should -BeFalse
+        $validator.Errors.Count | Should -Be 1
+        $validator.Errors | Select-Object -First 1 | Should -Match 'broken_schema.*(line 6).*(position 4)'
+    }
+    It 'fails with broken manifest' {
+        $validator = New-Object Scoop.Validator($schema, $true)
+        $validator.Validate("$PSScriptRoot/fixtures/manifest/broken_wget.json") | Should -BeFalse
+        $validator.Errors.Count | Should -Be 1
+        $validator.Errors | Select-Object -First 1 | Should -Match 'broken_wget.*(line 5).*(position 4)'
+    }
+    It 'fails with invalid manifest' {
+        $validator = New-Object Scoop.Validator($schema, $true)
+        $validator.Validate("$PSScriptRoot/fixtures/manifest/invalid_wget.json") | Should -BeFalse
+        $validator.Errors.Count | Should -Be 16
+        $validator.Errors | Select-Object -First 1 | Should -Match "Property 'randomproperty' has not been defined and the schema does not allow additional properties\."
+        $validator.Errors | Select-Object -Last 1 | Should -Match 'Required properties are missing from object: version\.'
+    }
+}
diff --git a/test/Scoop-TestLib.ps1 b/test/Scoop-TestLib.ps1
index 1e58122338..2194536736 100644
--- a/test/Scoop-TestLib.ps1
+++ b/test/Scoop-TestLib.ps1
@@ -1,69 +1,3 @@
-if (!$script:run) { $script:run = 0 }
-if (!$script:failed) { $script:failed = 0 }
-
-function filter_tests($arg) {
-    if (!$arg) { return }
-    $script:filter = $arg -join ' '
-    Write-Host "filtering by '$filter'"
-}
-function test($desc, $assertions) {
-    if ($filter -and $desc -notlike "*$filter*") { return }
-    $script:test = $desc
-    $script:run++
-    try {
-        $assertions.invoke()
-    } catch {
-        script:fail $_.exception.innerexception.message
-    }
-    $script:test = $null
-}
-
-function assert($x, $eq = '__undefined', $ne = '__undefined') {
-    if ($args.length -gt 0) {
-        fail "unexpected arguments: $args"
-    }
-
-    if ($eq -ne '__undefined') {
-        if ($x -ne $eq) { fail "$(fmt $x) != $(fmt $eq)" }
-    } elseif ($ne -ne '__undefined') {
-        if ($x -eq $ne) { fail "$(fmt $x) == $(fmt $ne)" }
-    } else {
-        if (!$x) { fail "$x" }
-    }
-}
-
-function test_results {
-    $col = 'darkgreen'
-    $res = 'all passed'
-    if ($script:failed -gt 0) {
-        $col = 'darkred'
-        $res = "$script:failed failed"
-    }
-
-    Write-Host "ran $script:run tests, " -NoNewline
-    Write-Host $res -f $col
-}
-
-function script:fail($msg) {
-    $script:failed++
-    $invoked = (Get-Variable -Scope 1 myinvocation).value
-
-    $script = Split-Path $invoked.scriptname -Leaf
-    $line = $invoked.scriptlinenumber
-
-    if ($script:test) { $msg = "$script:test`r`n      -> $msg" }
-
-    Write-Host "FAIL: $msg" -f darkred
-    Write-Host "$script line $line`:"
-    Write-Host (($invoked.positionmessage -split "`r`n")[1..2] -join "`r`n")
-}
-
-function script:fmt($var) {
-    if ($null -eq $var) { return "`$null" }
-    if ($var -is [string]) { return "'$var'" }
-    return $var
-}
-
 # copies fixtures to a working directory
 function setup_working($name) {
     $fixtures = "$PSScriptRoot/fixtures/$name"
@@ -73,11 +7,7 @@ function setup_working($name) {
     }
 
     # reset working dir
-    if ($PSVersionTable.Platform -eq 'Unix') {
-        $working_dir = "/tmp/ScoopTestFixtures/$name"
-    } else {
-        $working_dir = "$env:TEMP/ScoopTestFixtures/$name"
-    }
+    $working_dir = "$([IO.Path]::GetTempPath())ScoopTestFixtures/$name"
 
     if (Test-Path $working_dir) {
         Remove-Item -Recurse -Force $working_dir
diff --git a/test/Scoop-Versions.Tests.ps1 b/test/Scoop-Versions.Tests.ps1
index 17568ddb60..536f9cc7c3 100644
--- a/test/Scoop-Versions.Tests.ps1
+++ b/test/Scoop-Versions.Tests.ps1
@@ -1,5 +1,7 @@
-. "$PSScriptRoot\Scoop-TestLib.ps1"
-. "$PSScriptRoot\..\lib\versions.ps1"
+BeforeAll {
+    . "$PSScriptRoot\Scoop-TestLib.ps1"
+    . "$PSScriptRoot\..\lib\versions.ps1"
+}
 
 Describe 'versions comparison' -Tag 'Scoop' {
     Context 'semver compliant versions' {
@@ -90,10 +92,21 @@ Describe 'versions comparison' -Tag 'Scoop' {
         }
 
         It 'handles equal versions' {
+            function get_config { $null }
             Compare-Version '12.0' '12.0' | Should -Be 0
             Compare-Version '7.0.4-9' '7.0.4-9' | Should -Be 0
             Compare-Version 'nightly-20190801' 'nightly' | Should -Be 0
             Compare-Version 'nightly-20190801' 'nightly-20200801' | Should -Be 0
         }
+
+        It 'handles nightly versions with `update_nightly`' {
+            function get_config { $true }
+            Mock Get-Date { '20200801' }
+            Compare-Version 'nightly-20200801' 'nightly' | Should -Be 0
+            Compare-Version 'nightly-20200730' 'nightly' | Should -Be 1
+            Compare-Version 'nightly-20200730' 'nightly-20200801' | Should -Be 1
+            Compare-Version 'nightly-20200802' 'nightly' | Should -Be -1
+            Compare-Version 'nightly-20200802' 'nightly-20200801' | Should -Be -1
+        }
     }
 }
diff --git a/test/bin/init.ps1 b/test/bin/init.ps1
index a37125182f..14e32d2a6b 100644
--- a/test/bin/init.ps1
+++ b/test/bin/init.ps1
@@ -1,22 +1,21 @@
 #Requires -Version 5.1
-Write-Host "PowerShell: $($PSVersionTable.PSVersion)"
-Write-Host (7z.exe | Select-String -Pattern '7-Zip').ToString()
-Write-Host 'Check and install testsuite dependencies ...'
-if (Get-InstalledModule -Name Pester -MinimumVersion 4.0 -MaximumVersion 4.99 -ErrorAction SilentlyContinue) {
-    Write-Host 'Pester 4 is already installed.'
+Write-Output "PowerShell: $($PSVersionTable.PSVersion)"
+Write-Output 'Check and install testsuite dependencies ...'
+if (Get-InstalledModule -Name Pester -MinimumVersion 5.2 -MaximumVersion 5.99 -ErrorAction SilentlyContinue) {
+    Write-Output 'Pester 5 is already installed.'
 } else {
-    Write-Host 'Installing Pester 4 ...'
-    Install-Module -Repository PSGallery -Scope CurrentUser -Force -Name Pester -MinimumVersion 4.0 -MaximumVersion 4.99 -SkipPublisherCheck
+    Write-Output 'Installing Pester 5 ...'
+    Install-Module -Repository PSGallery -Scope CurrentUser -Force -Name Pester -MinimumVersion 5.2 -MaximumVersion 5.99 -SkipPublisherCheck
 }
 if (Get-InstalledModule -Name PSScriptAnalyzer -MinimumVersion 1.17 -ErrorAction SilentlyContinue) {
-    Write-Host 'PSScriptAnalyzer is already installed.'
+    Write-Output 'PSScriptAnalyzer is already installed.'
 } else {
-    Write-Host 'Installing PSScriptAnalyzer ...'
+    Write-Output 'Installing PSScriptAnalyzer ...'
     Install-Module -Repository PSGallery -Scope CurrentUser -Force -Name PSScriptAnalyzer -SkipPublisherCheck
 }
 if (Get-InstalledModule -Name BuildHelpers -MinimumVersion 2.0 -ErrorAction SilentlyContinue) {
-    Write-Host 'BuildHelpers is already installed.'
+    Write-Output 'BuildHelpers is already installed.'
 } else {
-    Write-Host 'Installing BuildHelpers ...'
+    Write-Output 'Installing BuildHelpers ...'
     Install-Module -Repository PSGallery -Scope CurrentUser -Force -Name BuildHelpers -SkipPublisherCheck
 }
diff --git a/test/bin/test.ps1 b/test/bin/test.ps1
index f70805aded..ffb35351a7 100644
--- a/test/bin/test.ps1
+++ b/test/bin/test.ps1
@@ -1,40 +1,41 @@
 #Requires -Version 5.1
 #Requires -Modules @{ ModuleName = 'BuildHelpers'; ModuleVersion = '2.0.1' }
-#Requires -Modules @{ ModuleName = 'Pester'; MaximumVersion = '4.99' }
+#Requires -Modules @{ ModuleName = 'Pester'; ModuleVersion = '5.2.0' }
 #Requires -Modules @{ ModuleName = 'PSScriptAnalyzer'; ModuleVersion = '1.17.1' }
 param(
-    [String] $TestPath = $(Convert-Path "$PSScriptRoot\..\")
+    [String] $TestPath = (Convert-Path "$PSScriptRoot\..")
 )
 
-$splat = @{
-    Path     = $TestPath
-    PassThru = $true
+$pesterConfig = New-PesterConfiguration -Hashtable @{
+    Run    = @{
+        Path     = $TestPath
+        PassThru = $true
+    }
+    Output = @{
+        Verbosity = 'Detailed'
+    }
+}
+$excludes = @()
+
+if ($IsLinux -or $IsMacOS) {
+    Write-Warning 'Skipping Windows-only tests on Linux/macOS'
+    $excludes += 'Windows'
 }
 
 if ($env:CI -eq $true) {
     Write-Host "Load 'BuildHelpers' environment variables ..."
     Set-BuildEnvironment -Force
-    $CI_WIN = (($env:RUNNER_OS -eq 'Windows') -or ($env:CI_WINDOWS -eq $true))
-
-    $excludes = @()
-    $commit = $env:BHCommitHash
-    $commitMessage = $env:BHCommitMessage
 
     # Check if tests are called from the Core itself, if so, adding excludes
-    if ($TestPath -eq $(Convert-Path "$PSScriptRoot\..\")) {
-        if ($commitMessage -match '!linter') {
+    if ($TestPath -eq (Convert-Path "$PSScriptRoot\..")) {
+        if ($env:BHCommitMessage -match '!linter') {
             Write-Warning "Skipping code linting per commit flag '!linter'"
             $excludes += 'Linter'
         }
 
-        if (!$CI_WIN) {
-            Write-Warning 'Skipping tests and code linting for decompress.ps1 because they only work on Windows'
-            $excludes += 'Decompress'
-        }
-
-        $changedScripts = (Get-GitChangedFile -Include '*.ps1' -Commit $commit)
+        $changedScripts = (Get-GitChangedFile -Include '*.ps1', '*.psd1', '*.psm1' -Commit $env:BHCommitHash)
         if (!$changedScripts) {
-            Write-Warning "Skipping tests and code linting for *.ps1 files because they didn't change"
+            Write-Warning "Skipping tests and code linting for PowerShell scripts because they didn't change"
             $excludes += 'Linter'
             $excludes += 'Scoop'
         }
@@ -44,12 +45,14 @@ if ($env:CI -eq $true) {
             $excludes += 'Decompress'
         }
 
-        if ('Decompress' -notin $excludes) {
+        if ('Decompress' -notin $excludes -and 'Windows' -notin $excludes) {
             Write-Host 'Install decompress dependencies ...'
 
+            Write-Host (7z.exe | Select-String -Pattern '7-Zip').ToString()
+
             $env:SCOOP_HELPERS_PATH = 'C:\projects\helpers'
             if (!(Test-Path $env:SCOOP_HELPERS_PATH)) {
-                New-Item -ItemType Directory -Path $env:SCOOP_HELPERS_PATH
+                New-Item -ItemType Directory -Path $env:SCOOP_HELPERS_PATH | Out-Null
             }
 
             $env:SCOOP_LESSMSI_PATH = "$env:SCOOP_HELPERS_PATH\lessmsi\lessmsi.exe"
@@ -83,13 +86,8 @@ if ($env:CI -eq $true) {
         }
     }
 
-    if ($excludes.Length -gt 0) {
-        $splat.ExcludeTag = $excludes
-    }
-
     # Display CI environment variables
-    $buildVariables = ( Get-ChildItem -Path 'Env:' ).Where( { $_.Name -match '^(?:BH|CI(?:_|$)|APPVEYOR|GITHUB_|RUNNER_|SCOOP_)' } )
-    $buildVariables += ( Get-Variable -Name 'CI_*' -Scope 'Script' )
+    $buildVariables = (Get-ChildItem -Path 'Env:').Where({ $_.Name -match '^(?:BH|CI(?:_|$)|APPVEYOR|GITHUB_|RUNNER_|SCOOP_)' })
     $details = $buildVariables |
         Where-Object -FilterScript { $_.Name -notmatch 'EMAIL' } |
         Sort-Object -Property 'Name' |
@@ -97,24 +95,22 @@ if ($env:CI -eq $true) {
         Out-String
     Write-Host 'CI variables:'
     Write-Host $details -ForegroundColor DarkGray
+}
 
-    # AppVeyor
-    if ($env:BHBuildSystem -eq "AppVeyor") {
-        $resultsXml = "$PSScriptRoot\TestResults.xml"
-        $splat += @{
-            OutputFile   = $resultsXml
-            OutputFormat = 'NUnitXML'
-        }
-
-        Write-Host 'Invoke-Pester' @splat
-        $result = Invoke-Pester @splat
+if ($excludes.Length -gt 0) {
+    $pesterConfig.Filter.ExcludeTag = $excludes
+}
 
-        (New-Object Net.WebClient).UploadFile("https://ci.appveyor.com/api/testresults/nunit/$($env:APPVEYOR_JOB_ID)", $resultsXml)
-        exit $result.FailedCount
-    }
+if ($env:BHBuildSystem -eq 'AppVeyor') {
+    # AppVeyor
+    $resultsXml = "$PSScriptRoot\TestResults.xml"
+    $pesterConfig.TestResult.Enabled = $true
+    $pesterConfig.TestResult.OutputPath = $resultsXml
+    $result = Invoke-Pester -Configuration $pesterConfig
+    Add-TestResultToAppveyor -TestFile $resultsXml
+} else {
+    # GitHub Actions / Local
+    $result = Invoke-Pester -Configuration $pesterConfig
 }
 
-# GitHub Actions / Local
-Write-Host 'Invoke-Pester' @splat
-$result = Invoke-Pester @splat
 exit $result.FailedCount