import org.jmock.Expectations; import org.jmock.Mockery; import org.junit.Test; public class ExampleTest { @Test public void testMockObjectInteraction() { Mockery mockery = new Mockery(); final MyInterface mockObject = mockery.mock(MyInterface.class); mockery.checking(new Expectations() {{ allowing(mockObject).getValue(); will(returnValue(42)); }}); MyClass myClass = new MyClass(mockObject); int result = myClass.getSomeValue(); mockery.assertIsSatisfied(); assertEquals(42, result); } }