standardize workflow test pattern

__tests__/verify-java.ps1

@@ -0,0 +1,11 @@
+if (!$args.Count -or !$args[0])
+{
+  throw "Must supply java version argument"
+}
+
+$java_version = & cmd.exe /c "java -version 2>&1" | Out-String
+Write-Host "Found java version: $java_version"
+if (!$java_version.Contains($args[0]))
+{
+  throw "Unexpected version"
+}