Tests file, for future use.

O365Essentials.Tests.ps1

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+$ModuleName = (Get-ChildItem $PSScriptRoot\*.psd1).BaseName
+$PrimaryModule = Get-ChildItem -Path $PSScriptRoot -Filter '*.psd1' -Recurse -ErrorAction SilentlyContinue -Depth 1
+if (-not $PrimaryModule) {
+    throw "Path $PSScriptRoot doesn't contain PSD1 files. Failing tests."
+}
+if ($PrimaryModule.Count -ne 1) {
+    throw 'More than one PSD1 files detected. Failing tests.'
+}
+$PSDInformation = Import-PowerShellDataFile -Path $PrimaryModule.FullName
+$RequiredModules = @(
+    'Pester'
+    'PSWriteColor'
+    'PSParseHTML'
+    if ($PSDInformation.RequiredModules) {
+        $PSDInformation.RequiredModules
+    }
+)
+foreach ($Module in $RequiredModules) {
+    if ($Module -is [System.Collections.IDictionary]) {
+        $Exists = Get-Module -ListAvailable -Name $Module.ModuleName
+        if (-not $Exists) {
+            Write-Warning "$ModuleName - Downloading $($Module.ModuleName) from PSGallery"
+            Install-Module -Name $Module.ModuleName -Force -SkipPublisherCheck
+        }
+    } else {
+        $Exists = Get-Module -ListAvailable $Module -ErrorAction SilentlyContinue
+        if (-not $Exists) {
+            Install-Module -Name $Module -Force -SkipPublisherCheck
+        }
+    }
+}
+
+Write-Color 'ModuleName: ', $ModuleName, ' Version: ', $PSDInformation.ModuleVersion -Color Yellow, Green, Yellow, Green -LinesBefore 2
+Write-Color 'PowerShell Version: ', $PSVersionTable.PSVersion -Color Yellow, Green
+Write-Color 'PowerShell Edition: ', $PSVersionTable.PSEdition -Color Yellow, Green
+Write-Color 'Required modules: ' -Color Yellow
+foreach ($Module in $PSDInformation.RequiredModules) {
+    if ($Module -is [System.Collections.IDictionary]) {
+        Write-Color '   [>] ', $Module.ModuleName, ' Version: ', $Module.ModuleVersion -Color Yellow, Green, Yellow, Green
+    } else {
+        Write-Color '   [>] ', $Module -Color Yellow, Green
+    }
+}
+Write-Color
+
+Import-Module $PSScriptRoot\*.psd1 -Force
+Import-Module Pester -Force
+$Configuration = [PesterConfiguration]::Default
+$Configuration.Run.Path = "$PSScriptRoot\Tests"
+$Configuration.Run.Exit = $true
+$Configuration.Should.ErrorAction = 'Continue'
+$Configuration.CodeCoverage.Enabled = $false
+$Configuration.Output.Verbosity = 'Detailed'
+$Result = Invoke-Pester -Configuration $Configuration
+#$result = Invoke-Pester -Script $PSScriptRoot\Tests -Verbose -Output Detailed #-EnableExit
+
+if ($Result.FailedCount -gt 0) {
+    throw "$($Result.FailedCount) tests failed."
+}