What metrics did you use to evaluate test coverage in your last project?

To assess test coverage in Java projects, the following metrics are usually used:

• Line Coverage — the percentage of code lines that were executed during testing.
• Branch Coverage — the percentage of branches (conditional operators) covered, indicating how thoroughly all logical paths are tested.
• Method Coverage — the percentage of called methods.
• Class Coverage — the percentage of classes in which at least one method was called.

In my last project, I used tools such as JaCoCo or Cobertura, which provide detailed reports on these metrics. Line Coverage helps understand how much code is actually tested, while Branch Coverage shows how thoroughly the logic is checked.

For example, if Line Coverage is high but Branch Coverage is low, it means that not all condition variants are tested.

Using these metrics helps improve test quality and reduce the likelihood of missing errors.