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Mockito is a mocking framework used to better isolate tests by using mock objects (dummy implementations).

Here is how to create a mock object:

	 Node node = Mockito.mock(Node.class);

You can also create mock objects with the annotations @RunWith and @Mock:

	@RunWith(MockitoJUnitRunner.class)
	public class MyClass  {

		@Mock private Node node;
		
		// Other code
		
	}

Or you can use the annotation @Mock alone:

	public class MyClass  {

		@Mock private Node node;

		public MyClass() {
			MockitoAnnotations.initMocks(this);
		}
		
		// Other code
		
	}

Use @InjectMocks insead of @Mock if you also want to execute the constructor or inject by either constructor, setter or property:

	@InjectMocks Node node;

On a mock object you can do different things. You can set a return value for a particular method:

	Mockito.when(mockObject.myMethod()).thenReturn(49);

You can do the same, but without actually executing the method:

	Mockito.doReturn(49).when(myMock).MyMethod();

If your method accepts a parameter, you can return a specific result only for a specific input:

	Mockito.doReturn(49).when(myMock).MySquareMethod(7);

You can verify a method has been called:

	Mockito.verify(myMock).myMethod(Matchers.eq(5));

You can verify the number of calls to a method:

	Mockito.verify(myMock, Mockito.times(3));

You can use the annotation @Spy to wrap a real object and add some control over it:

	@Spy private Node node = new Node();

Or:

	Node node = spy(new Node());