Mock is a widely used technology in unit test domain. It shields exteral and unnecessary factors and helps developers focus on the specific function to be tested.

EasyMock is a well known mock tool which can create mock object for given interface at runtime. The mock object's behavior can be fine defined prior the test code in the test case. EasyMock is based on java.lang.reflect.Proxy, which can create dynamic proxy class/object according to the given interfaces. It has the inherent limitation from the Proxy. It can create mock object for given interface only.

Mocquer is a similar mock tool as EasyMock. With the help of Dunamis Project, it extends the function of EasyMock to support mock object creation for both class and interface.