Which term refers to the percentage of decision outcomes that have been exercised by a test suite?

The term that refers to the percentage of decision outcomes that have been exercised by a test suite is decision coverage. This concept is crucial in testing as it specifically focuses on evaluating how much of the decision logic present in the code has been evaluated during testing.

In software testing, decision coverage measures whether each decision point (like an if-statement) in the program has been executed in both of its possible outcomes – true and false. Achieving high decision coverage is important to ensure that the test suite validates all possible paths and outcomes that the decision points can lead to, thus helping to identify potential issues and ensure more robust software quality.

While code coverage looks at the percentage of code that is executed by the test suite in general, and branch coverage specifically focuses on executing all branches of control statements, decision coverage focuses more narrowly on the outcomes of decision points. Test coverage, on the other hand, is a broader term that encompasses various types of coverage, including functional requirements and overall test effectiveness, but does not specifically measure decision outcomes.

Therefore, decision coverage is the most accurate term that reflects the percentage of decision outcomes exercised by a test suite.