Question

I’m having problems with counting method calls with Mockito. Problem is that the method whos calls I want to count is called in test class indirectly by other method. Here is the code:

public class ClassForTest {
    private Integer value;

    public void doSmth() {
        prepareValue("First call");
        prepareValue("Second call");
        prepareValue("Third call");
        System.out.println(value);
    }

    protected void prepareValue(String msg) {
        System.out.println("This is message: " + msg);
        value++;
    }
}

And the test class:

public class ClassForTestTest extends TestCase {
    @Test
    public void testDoSmth() {
        ClassForTest testMock = mock(ClassForTest.class);
        doNothing().when(testMock).prepareValue(anyString());
        testMock.doSmth();
        verify(testMock, times(3)).prepareValue(anyString());
    }
}

Having such exception:

Wanted but not invoked:
classForTest.prepareValue(<any>);
-> at org.testing.ClassForTestTest.testDoSmth(ClassForTestTest.java:24)

However, there were other interactions with this mock:
-> at org.testing.ClassForTestTest.testDoSmth(ClassForTestTest.java:21)

Any ideas please. Thanks in advance!

Answer 1

This will work. Using a spy calls the underlying method. Make sure value is initialized first.

    @Test
    public void testDoSmth() {
        ClassForTest testMock = spy(new ClassForTest());
        testMock.doSmth();
        verify(testMock, times(3)).prepareValue(anyString());
    }

    public class ClassForTest {
        private Integer value = 0;

        public void doSmth() {
            prepareValue("First call");
            prepareValue("Second call");
            prepareValue("Third call");
            System.out.println(value);
        }

        protected void prepareValue(String msg) {
            System.out.println("This is message: " + msg);
            value++;
        }
    }