This TestHarness exists so that a global transform can be run without using the Jar services mechanism, which requires building a jar. To use this simply create an instance of TransformTestHelper with an ASTTransformation and CompilePhase, then invoke parse(File) or parse(String). This test harness is not exactly the same as executing a global transformation but can greatly aide in debugging and testing a transform. You should still test your global transformation when packaged as a jar service before releasing it.
Compiles the File into a Class applying the transform specified in the constructor.