How do I interpret Jest coverage reports?

How do I interpret Jest coverage reports?

Jest coverage reports provide insights into how much of your code is tested. They show which lines, branches, and functions are covered by tests.

What do the different coverage metrics mean?

The main metrics are line coverage, branch coverage, and function coverage. Line coverage shows the percentage of executed lines, branch coverage indicates how many branches of control structures were tested, and function coverage shows how many functions were called.

How can I improve my coverage percentage?

To improve coverage, you can write more tests, especially for untested lines and branches. Focus on edge cases and error handling.

Is 100% coverage necessary?

Not necessarily. While 100% coverage can indicate thorough testing, it doesn't guarantee that your tests are effective. Focus on meaningful tests instead.