Add tests for native command arguments

test/powershell/Scripting/NativeExecution/NativeCommandArguments.Tests.ps1

@@ -0,0 +1,31 @@
+Describe "Native Command Arguments" -tags "CI" {
+    $testPath = 'TestDrive:\test.txt'
+    $powershellTestDir = $PSScriptRoot
+    while ($powershellTestDir -notmatch 'test[\\/]powershell$') {
+        $powershellTestDir = Split-Path $powershellTestDir
+    }
+    $echoArgsDir = Join-Path (Split-Path $powershellTestDir) EchoArgs
+
+    function Start-EchoArgs {
+        Push-Location $echoArgsDir
+        try {
+            dotnet run $args
+        } finally {
+            Pop-Location
+        }
+    }
+
+    It "Should handle quoted spaces correctly" {
+        $a = 'a"b c"d'
+        Start-EchoArgs $a 'a"b c"d' a"b c"d >$testPath
+        $testPath | Should Contain 'Arg 0 is <ab cd>'
+        $testPath | Should Contain 'Arg 1 is <ab cd>'
+        $testPath | Should Contain 'Arg 2 is <ab cd>'
+    }
+
+    It "Should handle spaces between escaped quotes" {
+        Start-EchoArgs 'a\"b c\"d' "a\`"b c\`"d" >$testPath
+        $testPath | Should Contain 'Arg 0 is <a"b c"d>'
+        $testPath | Should Contain 'Arg 1 is <a"b c"d>'
+    }
+}