CODEWITHSUNDEEP
javajunitmockito
john.p.doe
john.p.doe

Reputation: 521

Is there a way to make Mockito doNothing() when a method call actually returns something

So I have this method that internally calls another service and for my testing purpose I dont care about this internal call and I dont want this internal service to do anything.

For e.g. 

public void testMyMethod() {
        List<String> strings = otherService.getList(Employee);
}

Now I would like to use mockito in a way that this otherService.getList(Employee) does not do anything. It simply skips the execution for this one.

Upvotes: 7

Views: 14708

Answers (2)

Andika Tanuwijaya
Andika Tanuwijaya

Reputation: 191

If you already inject mock otherService, all the method calls in otherService.getList(Employee.class) will return an empty List as default unless you explicitly tell Mockito to return something (by using thenReturn) only if they are not void method. It depends on the business process in the getList method about what will it return.

TLDR, explicitly tell Mockito what to do for all method calls in the getList method so that the return value will meet your expectation.

Upvotes: 2

Federico Piazza
Federico Piazza

Reputation: 31045

You can use when and thenReturn as a normal test.

For instance, you can have this code:

public class Test 
{
    private OtherService otherService;

    public void doSomething() {
        otherService.getList(new Employee("X"));
    }

    /* Getters/Setters/Contructors */
}

@RunWith(MockitoJUnitRunner.class)
public class MyTest
{
    @Mock
    private OtherService otherService;

    @InjectMocks
    private Test test; // Test uses 'otherService' internally

    @Test
    public void testVoid()
    {
        test.doSomething(); // 'test' do something and it also invokes your otherService 

        // Mock your otherService method to return null (or whatever you want)
        when(otherService.getList(any(Employee.class))).thenReturn(null);
    }
}

Upvotes: 1

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