Mockito - how to mock/verify a method call which accepts a new object?

Question

I have a method (method1) that I\'d like to test, which based on parameters provided creates an object and calls another method (method2). So I\'m mocking method2, which accepts

Answer 1

You have a few options:

1. Implement equals and hashCode on SampleObj. Because you didn't wrap fooList in a matcher, Mockito checks with List.equals, which checks equals for corresponding objects in each List. The default behavior of Object.equals is that a.equals(b) iff a == b--that is, objects are equal iff they refer to the same instance--but you're welcome to override that if every SampleObj("foobar") equals every other SampleObj("foobar").

2. Use a Hamcrest Matcher you write.

   private static Matcher<List<SampleObj>> isAListWithObjs(String... strings) {
     return new AbstractMatcher<List<SampleObj>>() {
       @Override public boolean matches(Object object) {
         // return true if object is a list of SampleObj corresponding to strings
       }
     };
   }
   
   // in your test
   verify(mockedAnotherService).method2(argThat(isAnObjListWith("another param")));
   

   Note that you could also just make a Matcher of a single SampleObj, and then use a Hamcrest wrapper like hasItem. See more matchers here.

3. Use a Captor to check equals your own way:

   public class YourTest {
     // Populated with MockitoAnnotations.initMocks(this).
     // You can also use ArgumentCaptor.forClass(...), but with generics trouble.
     @Captor ArgumentCaptor<List<SampleObj>> sampleObjListCaptor;
   
     @Test public void testMethod1() {
       // ...
       verify(mockedAnotherService).method2(sampleObjListCaptor.capture());
       List<SampleObj> sampleObjList = sampleObjListCaptor.getValue();
   
       assertEquals(1, sampleObjList.size());
       assertEquals("another param", sampleObjList.get(0).getTitle());
     }