TestHook is used to induce testing behavior that can't be provoked externally. For example, unit tests may use hooks to throw IOExceptions, or to cause waiting behavior. To use this, a unit test should implement TestHook with a class that overrides the desired method. The desired code will have a method that allows the unit test to specify a hook, and will execute the hook if it is non-null. This should be done within an assert like so: assert TestHookExecute(myTestHook); See Tree.java for examples.
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