Add error stream and information stream tests

for native pipes

test/powershell/Language/Scripting/NativeExecution/NativeMinishell.Tests.ps1

@@ -10,9 +10,22 @@ Describe 'minishell for native executables' -Tag 'CI' {
     }
 
     It 'gets a hashtable object from minishell' {
-        $output = & powershell { @{'a' = 'b'} }
+        $output = & $powershell { @{'a' = 'b'} }
         ($output | measure).Count | Should Be 1
         ($output.GetType().Name) | Should Be 'Hashtable'
         $output['a'] | Should Be 'b'
     }
+
+    It 'gets the error stream from minishell' {
+        $output = & $powershell { Write-Error 'foo' } 2>&1
+        ($output | measure).Count | Should Be 1
+        ($output.GetType().Name) | Should Be 'ErrorRecord'
+        $output.FullyQualifiedErrorId | Should Be 'Microsoft.PowerShell.Commands.WriteErrorException'
+    }
+
+    It 'gets the information stream from minishell' {
+        $output = & $powershell { Write-Information 'foo' } 6>&1
+        ($output.GetType().Name) | Should Be 'InformationRecord'
+        $output | Should Be 'foo'
+    }
 }