import static org.mockito.Mockito.*;
@Test
public void test_aMethod()
{
    SomeClass myMock = mock(SomeClass.class);

    when(myMock.someFunctionToEmulate()).thenReturn("Mocked Result");

    myMock.callSomeFunction("foo", "bar");
    verify(myMock).callSomefunction("foo", "bar");
}