Add a test for whether unregistered listeners are called. #618
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Description
Currently, if you unregister a listener from a given DatabaseReference, it will correctly stop calling that listener.
But if you unregister a listener from a different instance of DatabaseReference that happens to point to the same path, it will continue to call the listener. (Because it's not considered the same object.)
This test shows that issue - it should not be merged unless the issue is either fixed or the failing test is disabled.
Testing
Integration tests.
Type of Change
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