escape expression

Author: Gijsreyn

dsc/tests/dsc_functions.tests.ps1

@@ -704,13 +704,14 @@ Describe 'tests for function expressions' {
   ) {
     param($expression, $expectedError)
 
+    $escapedExpression = $expression -replace "'", "''"
     $config_yaml = @"
             `$schema: https://aka.ms/dsc/schemas/v3/bundled/config/document.json
             resources:
             - name: Echo
               type: Microsoft.DSC.Debug/Echo
               properties:
-                output: "$expression"
+                output: '$escapedExpression'
 "@
     $out = dsc -l trace config get -i $config_yaml 2>$TestDrive/error.log
     $LASTEXITCODE | Should -Not -Be 0