@saleem's additional unit test for the Tire Pressure Monitoring System, using a custom mock class #18
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This solution has a new JUnit test class: AlarmTestUsingCustomMock. This illustrates the amount of verbose (and somewhat inelegant) code one has to write if a mocking framework like Mockito isn't used. It's useful for comparative purposes only -- as a "don't do this in practice" sort of thing!