What does a test coverage report indicate?

A test coverage report is an essential tool in software testing that provides insight into the extent to which the source code has been exercised during testing. Specifically, it indicates the percentage of code that has been tested, helping to identify untested paths, conditions, or functions within the application.

This is important for several reasons. By knowing how much of the code was executed during testing, developers and security professionals can assess the thoroughness of their testing procedures and determine which areas may still need examination or improvement. High test coverage often correlates with a lower chance of bugs and security vulnerabilities going undetected, but it does not guarantee that all potential issues have been found.

Other options, while relevant to testing, do not align with the specific purpose of a test coverage report. For instance, the number of errors found during testing is a measure of testing outcomes rather than coverage. The time taken to run test cases relates to testing efficiency, and the quality of the code being tested speaks more to the overall health and maintainability of the codebase rather than how much of it has been exercised. Thus, the focus of a test coverage report squarely lies on the percentage of code tested during execution.