Today's sharing: Clean code - unit testing

Steps for unit testing interfaces and abstract classes in Java: Create a test class for the interface. Create a mock class to implement the interface methods. Use the Mockito library to mock interface methods and write test methods. Abstract class creates a test class. Create a subclass of an abstract class. Write test methods to test the correctness of abstract classes.

PHP unit testing tool analysis: PHPUnit: suitable for large projects, provides comprehensive functionality and is easy to install, but may be verbose and slow. PHPUnitWrapper: suitable for small projects, easy to use, optimized for Lumen/Laravel, but has limited functionality, does not provide code coverage analysis, and has limited community support.

Performance tests evaluate an application's performance under different loads, while unit tests verify the correctness of a single unit of code. Performance testing focuses on measuring response time and throughput, while unit testing focuses on function output and code coverage. Performance tests simulate real-world environments with high load and concurrency, while unit tests run under low load and serial conditions. The goal of performance testing is to identify performance bottlenecks and optimize the application, while the goal of unit testing is to ensure code correctness and robustness.

Unit testing and integration testing are two different types of Go function testing, used to verify the interaction and integration of a single function or multiple functions respectively. Unit tests only test the basic functionality of a specific function, while integration tests test the interaction between multiple functions and integration with other parts of the application.

Table-driven testing simplifies test case writing in Go unit testing by defining inputs and expected outputs through tables. The syntax includes: 1. Define a slice containing the test case structure; 2. Loop through the slice and compare the results with the expected output. In the actual case, a table-driven test was performed on the function of converting string to uppercase, and gotest was used to run the test and the passing result was printed.

How to improve code coverage in PHP unit testing: Use PHPUnit's --coverage-html option to generate a coverage report. Use the setAccessible method to override private methods and properties. Use assertions to override Boolean conditions. Gain additional code coverage insights with code review tools.

It is crucial to design effective unit test cases, adhering to the following principles: atomic, concise, repeatable and unambiguous. The steps include: determining the code to be tested, identifying test scenarios, creating assertions, and writing test methods. The practical case demonstrates the creation of test cases for the max() function, emphasizing the importance of specific test scenarios and assertions. By following these principles and steps, you can improve code quality and stability.

Summary: By integrating the PHPUnit unit testing framework and CI/CD pipeline, you can improve PHP code quality and accelerate software delivery. PHPUnit allows the creation of test cases to verify component functionality, and CI/CD tools such as GitLabCI and GitHubActions can automatically run these tests. Example: Validate the authentication controller with test cases to ensure the login functionality works as expected.