add tracing to tests

Author: SteveL-MSFT

dsc/tests/dsc_resource_condition.tests.ps1

@@ -27,14 +27,14 @@ Describe 'Resource condition tests' {
     ) {
         param($operation, $property)
         $out = dsc config $operation -i $configYaml 2>$TestDrive/error.log | ConvertFrom-Json
-        $LASTEXITCODE | Should -Be 0
+        $LASTEXITCODE | Should -Be 0 -Because (Get-Content $TestDrive/error.log -Raw | Out-String)
         $out.results.count | Should -Be 1
         $out.results[0].result.$property.Output | Should -BeExactly "This should be executed"
     }
 
     It 'resource should be skipped for export' {
         $out = dsc config export -i $configYaml 2>$TestDrive/error.log | ConvertFrom-Json
-        $LASTEXITCODE | Should -Be 0
+        $LASTEXITCODE | Should -Be 0 -Because (Get-Content $TestDrive/error.log -Raw | Out-String)
         $out.resources.count | Should -Be 1
         $out.resources[0].type | Should -BeExactly 'Microsoft.DSC.Debug/Echo'
         $out.resources[0].properties.output | Should -BeExactly "This should be executed"