delayTestFinish() from GWTTestCase not working in pure java tests

I'm trying to verify that some JavaScript code behaves identically to an existing Java library. I've created some tests that subclass GWTTestCase to check this. Unfortunately, when I try and do the pure-java test in development mode (by returning null for the module name, as the documentation suggests), the methods like delayTestFinish() don't appear to work. Tests just finish as soon as the test method exits. Is this the intended behavior? If so, has anybody made a pure-java implementation of GWTTestCase so test logic can be shared between client and server code?

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