Merge pull request #12 from DevExpress-Examples/fix-last-error-code

Update test-example.ps1

test-example.ps1

@@ -57,20 +57,23 @@ function Process-JavaScriptProjects {
         npm install $packageList --save --save-exact --no-fund
         if (-not $?) {
             Write-Error "`nERROR: Failed to install DevExtreme packages: $($folder.Name)"
+            $global:LASTEXITCODE = 1
             $global:errorCode = 1
         }
 
         Write-Output "`nInstalling the rest of the packages $($folder.Name)"
         npm install --save --save-exact --no-fund --loglevel=error
         if (-not $?) {
             Write-Error "`nERROR: Failed to install packages: $($folder.Name)"
+            $global:LASTEXITCODE = 1
             $global:errorCode = 1
         }
 
         Write-Output "`nBuilding the project with 'npm run build' $($folder.Name)"
         npm run build
         if (-not $?) {
             Write-Error "`nERROR: Failed to build the project: $($folder.Name)"
+            $global:LASTEXITCODE = 1
             $global:errorCode = 1
         }
 
@@ -100,6 +103,7 @@ function Process-DotNetProjects {
             Write-Output "`nBuild succeeded for $($slnFile.FullName)."
         } else {
             Write-Error "`nBuild failed for $($slnFile.FullName)."
+            $global:LASTEXITCODE = 1
             $global:errorCode = 1
         }
     }