Testauspeitto

Testauspeitto, often translated as test coverage, is a metric used in software development to measure the degree to which the source code of a program has been tested. It quantifies the percentage of code that is executed when a particular set of tests is run. Higher test coverage generally indicates that more of the code has been exercised, which can increase confidence in the software's quality and reduce the likelihood of defects.

There are various types of test coverage, including statement coverage, branch coverage, and path coverage. Statement coverage tracks whether each executable line of code has been run at least once. Branch coverage goes further by ensuring that each possible outcome of a conditional statement (e.g., both the true and false branches of an if statement) has been executed. Path coverage is the most exhaustive, aiming to execute every possible unique path through a program's code, which can be extremely complex and time-consuming for all but the simplest programs.

Test coverage tools automate the process of measuring these metrics. Developers and testers use this information to identify untested parts of the codebase. While high test coverage is a desirable goal, it does not guarantee the absence of bugs. Code that is executed might still contain logical errors, or tests may not cover all possible input values or edge cases. Therefore, test coverage should be viewed as one important aspect of a comprehensive testing strategy.