Xiao Wang created PROTON-2431:
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Summary: Refactor SinkHandler in ReactorTest.java to improve test
design
Key: PROTON-2431
URL: https://issues.apache.org/jira/browse/PROTON-2431
Project: Qpid Proton
Issue Type: Improvement
Components: proton-j
Reporter: Xiao Wang
h3. Description
I noticed that there is a test class
[SinkHandler|https://github.com/apache/qpid-proton-j/blob/c242c260e44d94bba1a9c82a22af3b0b2a0dc5c6/proton-j/src/test/java/org/apache/qpid/proton/reactor/ReactorTest.java#L388]
implements production class
[BaseHandler|https://github.com/apache/qpid-proton-j/blob/c242c260e44d94bba1a9c82a22af3b0b2a0dc5c6/proton-j/src/main/java/org/apache/qpid/proton/engine/BaseHandler.java#L32]
to assist testing methd
[ReactorImpl:run()|https://github.com/apache/qpid-proton-j/blob/c242c260e44d94bba1a9c82a22af3b0b2a0dc5c6/proton-j/src/main/java/org/apache/qpid/proton/reactor/impl/ReactorImpl.java#L354].
This might not be the best priactice in unit testing and can be improved by
leveraging mocking frameworks.
h3. Current Implementation
* {{SinkHandler}} implements {{BaseHandler}} and creates a new variable to
keep tracking of the method invocation status for {{onDelivery(Devent)}}.
* In test cases, after executing test target, the new variable will be used in
assertion statement to check the execution status of {{onDelivery(Devent)}}.
h3. Proposed Implementation
* Replace {{SinkHandler}} with a mocking object created by Mockito.
* Extract the attribute into {{transfer(int, int)}} to surface counting logic.
* Use method stub to control the behavior of the mocking object.
h3. Motivation
- Decouple test class `SinkHandler` from production class `BaseHandler`.
- Make test logic more clear by using method stub instead of method overriding.
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