Migration to Pester tests

images/win/scripts/Tests/Haskell.Tests.ps1

@@ -0,0 +1,33 @@
+Describe "Haskell" {
+    It "ghc" {
+        "ghc --version" | Should -ReturnZeroExitCode
+    }
+
+    It "cabal" {
+        "cabal --version" | Should -ReturnZeroExitCode
+    }
+
+    $chocoPackagesPath = Join-Path $env:ChocolateyInstall "lib"
+    [array]$ghcVersionList = Get-ChildItem -Path $chocoPackagesPath -Filter "ghc.*" | ForEach-Object { $_.Name.TrimStart("ghc.") }
+    $ghcCount = $ghcVersionList.Count
+
+    It "Accurate 3 versions of GHC are installed" -TestCases @{ghcCount = $ghcCount} {
+        $ghcCount | Should -BeExactly 3
+    }
+
+    $ghcTestCases = $ghcVersionList | ForEach-Object {
+        @{
+            ghcVersion = $_
+        }
+    }
+
+    It "Validation each of GHC version" -TestCases $ghcTestCases {
+        $binGhcPath = Join-Path $env:ChocolateyInstall "lib\ghc.$ghcVersion\tools\ghc-$ghcVersion\bin\ghc.exe"
+        & $binGhcPath --version | Should -Match $ghcVersion
+    }
+
+    It "Default version of GHC should be the latest installed" {
+        $defaultGhcVersion = $ghcVersionList | Sort-Object {[Version]$_} |Select-Object -Last 1
+        ghc --version | Should -Match $defaultGhcVersion
+    }
+}