EasyMock: Dynamic Mock Objects for JUnit

In Extreme Programming, unit testing is an integral activity of everyday software development. For isolating units in the tests, Mock Objects are often used to simulate collabo-rators of the units under test. However, writing and main-taining Mock Objects may become a tedious task. This paper presents the Java library EasyMock that dynamically generates Mock Objects for interfaces. This moves the specification of the Mock Objects into the test methods, avoids implementation mistakes, and eases refactoring