Can you explain what is meant by test coverage level in a project?

Test coverage level is a metric that shows what part of the project code is tested. It helps assess the quality of testing and identify areas of code that remain untested.

Main types of coverage:

• Line coverage: how many lines of code are executed during tests.
• Branch coverage: how many logical branches (if, switch) are tested.
• Method coverage: how many methods are invoked by tests.

For example, if you have 100 lines of code and tests execute 80 of them, the line coverage will be 80%.

A high level of coverage does not guarantee the absence of errors, but it reduces the risk of undetected bugs. It is important to combine coverage with test quality.