Rapid test is a Visual Studio Addin that helps the developer be more productive and focused on coding. Whenever you build your code, Rapid-Test runs your tests as a part of the build cycle, reporting test failures as any other compilation error.
Rapid-Test uses test selection, in order to execute only tests which are affected by your last code changes, resulting in very fast feedback loop.

How Rapid-Test works?

Rapid-Test uses a combination of static and dynamic analysis in order to select the minimal subset of tests needed to verify recent changes in the code.
In most cases it means that only a very small number of tests are executed each time, allowing an extremely short delay until results are shown.