Test Coverage Guide

Benefits of Writing Unit Tests

• Unit tests help everyone dive into the details of the code and understand its functionality.
• Through test cases, we can discover bugs and enhance the robustness of the code.
• Test cases also serve as demo usage of the code.

Some Design Principles for Unit Test Cases

• Steps, granularity, and combination conditions should be carefully designed.
• Pay attention to boundary conditions.
• Unit tests should also be well-designed; do not write useless code.
• When you find a method difficult to unit test, if it can be confirmed that this method is smelly code, then refactor it together with the developer.
• The mock framework used in Dubbo is: mockito. Below are some developer guides: mockito tutorial, mockito refcard
• TDD (optional): When you start writing a new feature, you can try to write the test cases first.

Test Coverage Threshold

• At this stage, the test coverage threshold for Delta changes is: >=60%, the higher the better.
• We can see the test report on this page: https://codecov.io/gh/apache/dubbo