Added powershell test

Author: Undalevein

cpp/test.ps1

@@ -0,0 +1,39 @@
+function Assert-MatchTests {
+    param (
+        [Parameter(Mandatory = $true, ValueFromPipeline)] $TestResult
+    )
+
+    if ($TestResult) {
+        Write-Error "Output does not match expected results."
+    }
+}
+
+$run = "$PSScriptRoot\a.exe"
+
+$Error.clear()
+g++ -std=c++20 "$PSScriptRoot\anagrams.cpp" && . $run rats |
+    Compare-Object (Get-Content "$PSScriptRoot\..\test\rats_heap_expected") |
+    Assert-MatchTests &&
+g++ -std=c++20 "$PSScriptRoot\animals.cpp" && . $run &&
+g++ -std=c++20 "$PSScriptRoot\basic_types.cpp" && . $run &&
+g++ -std=c++20 "$PSScriptRoot\if_then_else.cpp" && . $run &&
+g++ -std=c++20 "$PSScriptRoot\maps.cpp" && . $run &&
+g++ -std=c++20 "$PSScriptRoot\permutations.cpp" && . $run I like carrots |
+    Compare-Object (Get-Content "$PSScriptRoot\..\test\carrots_expected") |
+    Assert-MatchTests &&
+g++ -std=c++20 "$PSScriptRoot\smart_pointers.cpp" && . $run &&
+g++ -std=c++20 "$PSScriptRoot\sum_of_even_squares.cpp" && . $run &&
+g++ -std=c++20 "$PSScriptRoot\top_ten_scorers.cpp" && Get-Content "$PSScriptRoot\..\test\wnba_input" | . $run |
+    Compare-Object (Get-Content "$PSScriptRoot\..\test\wnba_expected") |
+    Assert-MatchTests &&
+g++ -std=c++20 "$PSScriptRoot\triple.cpp" && . $run |
+    Compare-Object (Get-Content "$PSScriptRoot\..\test\triple_expected") |
+    Assert-MatchTests &&
+ForEach-Object 'foo'
+
+if ($Error -or !$?) { 
+    "*** C++ TESTS FAILED ***" 
+}
+else { 
+    "C++ TESTS PASSED" 
+}