add ps adapter resource tests

Author: SteveL-MSFT

powershell-adapter/Tests/powershellgroup.resource.tests.ps1

@@ -364,4 +364,16 @@ Describe 'PowerShell adapter resource tests' {
         $res = $r | ConvertFrom-Json
         $res.actualState.HashTableProp.Name | Should -Be 'DSCv3'
     }
+
+    It 'Specifying version works' {
+        $out = dsc resource get -r TestClassResource/TestClassResource --version 0.0.1 | ConvertFrom-Json
+        $LASTEXITCODE | Should -Be 0
+        $out.actualState.Ensure | Should -BeExactly 'Present'
+    }
+
+    It 'Specifying a non-existent version returns an error' {
+        $null = dsc resource get -r TestClassResource/TestClassResource --version 0.0.2 2> $TestDrive/error.log
+        $LASTEXITCODE | Should -Be 7
+        Get-Content -Path $TestDrive/error.log | Should -Match 'Resource not found: TestClassResource/TestClassResource 0.0.2'
+    }
 }