Code Coverage

Code coverage measures used and unused code lines, statements, branches, etc. Depending on the programming language this is measured by instrumenting the code/binary and running the program, it’s test cases or simulating the code. In generate code coverage is a measure of test coverage. Unused code is not (yet) covered by tests.

The code coverage metric in percent is a ratio of used code versus all possibly usable code. A coverage of <100% indicates unused code. This can be dead code (unreachable) or untested code (⇒ needs more test cases).

Code Coverage Kinds

• Coverage

  • Code coverage

    • statement coverage / line coverage

    • branch coverage

    • expression coverage

    • toggle coverage

    • state coverage (of state machines)

    • transition coverage (of state machines)

  • Functional coverage

  • Documentation coverage

  • Test coverage