[Ubuntu] Move Haskell tests to separate file. (#2348)

* Move Haskell tests to separate file

* Minor fix

images/linux/scripts/tests/Haskell.Tests.ps1

@@ -0,0 +1,31 @@
+Describe "Haskell" {
+
+    $GHCCommonPath = "/opt/ghc"
+    $GHCVersions = Get-ChildItem -Path $GHCCommonPath | Where-Object { $_.Name -match "\d+\.\d+" }
+    
+    $testCase = @{ GHCVersions = $GHCVersions }
+
+    It "GHC directory contains three version of GHC" -TestCases $testCase {
+        param ([object] $GHCVersions)
+        $GHCVersions.Count | Should -Be 3
+    }
+
+    $testCases = $GHCVersions | ForEach-Object { @{ GHCPath = "${_}/bin/ghc"} }
+
+    It "GHC version <GHCPath>" -TestCases $testCases {
+            param ([string] $GHCPath)
+            "$GHCPath --version" | Should -ReturnZeroExitCode
+    }
+
+    It "Default GHC" {
+        "ghc --version" | Should -ReturnZeroExitCode
+    }
+
+    It "Cabal" {
+        "cabal --version" | Should -ReturnZeroExitCode
+    }
+
+    It "Stack" {
+        "stack --version" | Should -ReturnZeroExitCode
+    }
+}