Update pester in automation helper test

Author: aramprice

ci/tasks/test-units-stemcell-automation/task.yml

@@ -4,6 +4,9 @@ inputs:
   - name: bosh-windows-stemcell-builder-ci
   - name: stemcell-builder
 
+params:
+  STEMCELL_AUTOMATION_DIR: stemcell-builder/stembuild/stemcell-automation/
+
 run:
   path: powershell
   args:
@@ -20,12 +23,17 @@ run:
           $pesterModule | Save-Module -Path $moduleDir
           Import-Module "$moduleDir\Pester\$($pesterModule.Version)\Pester.psm1"
 
-          Import-Module ./bosh-windows-stemcell-builder-ci/ci/common-scripts/setup-windows-container.psm1;
-          Set-TmpDir;
-          pushd stemcell-builder/stembuild/stemcell-automation;
-          $result=Invoke-Pester -PassThru;
+          Import-Module ./bosh-windows-stemcell-builder-ci/ci/common-scripts/setup-windows-container.psm1
+
+          Set-TmpDir
+          pushd $env:STEMCELL_AUTOMATION_DIR
+          # NOTE: uncomment the lines below to see full stack trace
+          # $configuration = New-PesterConfiguration
+          # $configuration.Output.StackTraceVerbosity = "Full"
+          # $result=Invoke-Pester -Configuration $configuration
+          $result=Invoke-Pester -PassThru
           popd;
 
-          Write-Host "Failed Test Count:"$result.FailedCount;
+          Write-Host "Failed Test Count:"$result.FailedCount
           exit $result.FailedCount
         }