Mock Entity Model class using PowerMockito

[Jimmy Christianto]

Hello,

Has anyone tried to mock model class in Java Play Framework 2.3.x? I've tried using PowerMockito but it gave me exception:

 

org.mockito.exceptions.misusing.MissingMethodInvocationException: 

when() requires an argument which has to be 'a method call on a mock'.

For example:

    when(mock.getArticles()).thenReturn(articles);

Or 'a static method call on a prepared class`

For example:

    @PrepareForTest( { StaticService.class }) 

    TestClass{

       public void testMethod(){

           PowerMockito.mockStatic(StaticService.class);

           when(StaticService.say()).thenReturn(expected);

       }

    }

Also, this error might show up because:

1. inside when() you don't call method on mock but on some other object.

2. inside when() you don't call static method, but class has not been prepared.

Below is my example implementation:

PowerMockito.mockStatic(User.class);

when(User.find.byId(1L)).thenReturn(null);  

Thanks. 

[Marcos Pereira]

Hello Jimmy,

Maybe that is happening because you are mocking User instead of the "find" field inside of User class?

See:

User userMock = mock(User.class)

when(userMock.doSomething()).thenReturn(somethingElse);

The method "doSomething" belongs to "User" class, and then, this will work as expected.

In your case, the method "byId" does not belongs to "User" class. So, what you must do is mock the "find" instance.

Best,

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Marcos Pereira

Software Engineer, Lightbend.com