Chapter 5. Test coverage and development

I don’t think anybody tests enough of anything.

James Gosling

This chapter covers

  • Measuring test coverage
  • Writing testable code
  • Practicing test-driven development

In the previous chapters, we introduced testing software and started exploring testing with JUnit. We also presented various test methodologies.

Now that we’re writing test cases, it’s time to measure how good these tests are by using a test coverage tool to report what code is exercised by the tests and what code is not. We also discuss how to write code that’s easy to test. We finish by looking at test-driven development (TDD).

5.1. Measuring test coverage

Writing unit tests gives you the confidence to change and refactor an application. ...

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