Test Coverage Guide

Unit test code can help everyone to go into details and understand the function of the code.
We can find bugs by test case, and then enhance the robustness of the code.
Test case code is also the demo usage of the core code.

Steps, fine-grained and combination conditions should be well designed.
Attention to boundary condition test
Test code should also be designed without writing useless code.
When you find a method that is hard to write unit test, if you can be sure the method is “smelly code”, then refactor it with the committer.
The mock framework in dubbo is: mockito. Some tutorials:mockito tutorial,mockito refcard
TDD（optional）：When you start a new issue, you can try to write test case at first

In the stage, the test coverage specified value of delta changed codes is ：>=60%. The higher, the better.
We can see the coverage report in this page: https://codecov.io/gh/apache/dubbo

Feedback