Refactor MockChannelListener with mocking object and improve testing logic #462
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Fix CAY-2717
Description
Refactor test class DataContextDataChannelEventsIT.java by using Mockito.
Motivation
MockChannelListenerfrom production interfaceDataChannelListenerMockito.verify()to directly verify the behavior of the mocking object and make test condition more explict.Key changed/added classes in this PR
MockChannelListener, decoupled test from production code.Mockito.verify()to verify the invocation status ofgraphChanged(GraphEvent),graphFlushed(GraphEvent)andgraphRolledback(GraphEvent).