Can Mockito Mock Abstract Classes?

Mocking Abstract Classes with Mockito

When testing abstract classes, manually crafting mocks can be inconvenient. Mockito provides a more efficient solution.

Query:

Is it possible to mock an abstract class using Mockito rather than manual mock creation? If so, how?

Answer:

Mockito offers the option to mock abstract classes without creating a concrete subclass. Using Mockito.mock(My.class, Answers.CALLS_REAL_METHODS), you can create a partial mock where the abstract methods are handled by the mock itself.

For example:

<code class="java">public abstract class My {
    public Result methodUnderTest() { ... }
    protected abstract void methodIDontCareAbout();
}
 
public class MyTest {
    @Test
    public void shouldFailOnNullIdentifiers() {
        My my = Mockito.mock(My.class, Answers.CALLS_REAL_METHODS);
        Assert.assertSomething(my.methodUnderTest());
    }
}</code>

Note that with CALLS_REAL_METHODS, all actual methods are executed unless explicitly overridden in the test. This approach provides greater flexibility than using a spy, which requires instantiating a subclass of the abstract class.

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