Change-Driven Testing

Today, testers have to test ever larger amounts of software in ever smaller periods of time. This makes it infeasible to simply execute entire test suites for every change. Also it has become impractical-if it ever was-to manually ensure that the tests cover all changes. In response to this challenge, we propose Change-Driven Testing. Change-Driven Testing uses Test-Impact Analysis to automatically find the relevant tests for any given code change and sort them in a way that increases the chance of catching mistakes early on. This makes testing more efficient, catching over 90% of mistakes in only 2% testing time. Furthermore, Change-Driven Testing uses Test-Gap Analysis to automatically identify test gaps, i.e., code changes that lack tests. This enables us to make conscious decisions about where to direct our limited testing resource to improve our testing effectiveness and notifies us about where we are missing regression tests.