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2) Examine the current tests (i.e. org.apache.kafka.streams.TopologyTest and refactor the testing code logics with the new MockStateStores.

A discussion that has been brought up is 

Jira
serverASF JIRA
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keyKAFKA-8630
. In-memory Window/Session store doesn't work well in tests because in the init() method, it has internally cast ProcessorContext into InternalProcessorContext, that way the tester couldn't use MockProcessorContext. Either we twist the init() method in the mock store to accommodate or we can somehow use InternalMockProcessorContext instead?

Rejected Alternatives

  1. Using the current EasyMock implementation. There is no strong argument against the current EasyMock implementation, it is easy to use and lightweight. The main argument for this KIP is to write better tests with a in-house mock state store support.

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