Mockito verify order / sequence of method calls

java unit-testing mockito

Is there a way to verify if a methodOne is called before methodTwo in Mockito?

public class ServiceClassA {
    public void methodOne(){}
 }

public class ServiceClassB {
    public void methodTwo(){}
 }

public class TestClass {
    public void method(){
        ServiceClassA serviceA = new ServiceClassA();
        ServiceClassB serviceB = new ServiceClassB();
        serviceA.methodOne();
        serviceB.methodTwo();
    }
}

Dennis C

InOrder helps you to do that.

ServiceClassA firstMock = mock(ServiceClassA.class);
ServiceClassB secondMock = mock(ServiceClassB.class);

Mockito.doNothing().when(firstMock).methodOne();   
Mockito.doNothing().when(secondMock).methodTwo();  

//create inOrder object passing any mocks that need to be verified in order
InOrder inOrder = inOrder(firstMock, secondMock);

//following will make sure that firstMock was called before secondMock
inOrder.verify(firstMock).methodOne();
inOrder.verify(secondMock).methodTwo();

This is correct, though the calls to doNothing are not needed here except as a placeholder for other stubbing. Mockito will silently accept void method calls by default.

It accept them while the object have no dependencies if the object have dependencies there will be an exception =)

consider inOrder.verifyNoMoreInteractions(); after the last verify in this example to verify that no other calls were made.

Just to clarify: It is safe to define inOrder just before verify - after invoking some (tested) methods on mocks.

Are the results the same for inOrder(firstMock, secondMock) and inOrder(secondMock, firstMock)? Perhaps you can update the answer to make a note about this.

entpnerd

Note that you can also use the InOrder class to verify that various methods are called in order on a single mock, not just on two or more mocks.

Suppose I have two classes Foo and Bar:

public class Foo {
  public void first() {}
  public void second() {}
}

public class Bar {
  public void firstThenSecond(Foo foo) {
    foo.first();
    foo.second();
  }
}

I can then add a test class to test that Bar's firstThenSecond() method actually calls first(), then second(), and not second(), then first(). See the following test code:

public class BarTest {
  @Test
  public void testFirstThenSecond() {
    Bar bar = new Bar();
    Foo mockFoo = Mockito.mock(Foo.class);
    bar.firstThenSecond(mockFoo);

    InOrder orderVerifier = Mockito.inOrder(mockFoo);
    // These lines will PASS
    orderVerifier.verify(mockFoo).first();
    orderVerifier.verify(mockFoo).second();

    // These lines will FAIL
    // orderVerifier.verify(mockFoo).second();
    // orderVerifier.verify(mockFoo).first();
  }
}

This should have been a comment on the accepted answer, not a whole new answer.

I disagree with your comment @ach The code sample helps, so a new answer makes sense.

Is there a way to verify the same method is called twice, but the verify the order of the parameters passed in? e.g. First find('foo'), then find('bar')

Looks like this might be my answer stackoverflow.com/questions/36573399/…

This is actually a better example than the accepted answer because it shows a more typical usage than doNothing()

Sean Connolly

Yes, this is described in the documentation. You have to use the InOrder class.

Example (assuming two mocks already created):

InOrder inOrder = inOrder(serviceAMock, serviceBMock);

inOrder.verify(serviceAMock).methodOne();
inOrder.verify(serviceBMock).methodTwo();

user3193413

For Kotlin users, you can go this way:

class MyTrackerTest {
    private val trackEventUseCase: TrackEventUseCase = mock()
    private val sut = MyTracker(trackEventUseCase)

    @Test
    fun `trackSomething SHOULD invoke tracker use case twice with correct event names WHEN called`() {
        sut.trackSomething()

        trackEventUseCase.inOrder {
            verify().invoke("Is it August?")
            verify().invoke("No!")
        }
    }

}

Thracian

With BDD it's

@Test
public void testOrderWithBDD() {


    // Given
    ServiceClassA firstMock = mock(ServiceClassA.class);
    ServiceClassB secondMock = mock(ServiceClassB.class);

    //create inOrder object passing any mocks that need to be verified in order
    InOrder inOrder = inOrder(firstMock, secondMock);

    willDoNothing().given(firstMock).methodOne();
    willDoNothing().given(secondMock).methodTwo();

    // When
    firstMock.methodOne();
    secondMock.methodTwo();

    // Then
    then(firstMock).should(inOrder).methodOne();
    then(secondMock).should(inOrder).methodTwo();


}

wthat is willDoNothing() doing there? Where is the reference? Why is it preceeding?

Mockito verify order / sequence of method calls

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