Mock objects calling final classes static methods with Mockito

Question

I just started mocking different layers of our application. I came to a point where one of my mock objects is returning NPE when it calls a final class static method. Is there a way around this?

e.g.

when(mockObject.someMethod(FinalClass.staticMethod(someParam)).anotherMethodCall)
    .thenReturn("someString");

Solution 1

You have to use PowerMock and Mockito together.

I don't understand what your code snippet is trying to do, but the following snippets allow the static getInstance() method of the Calendar class to return a mocked Calendar Object. Maybe that'll point you in the right direction

At the class level:

@RunWith(PowerMockRunner.class)
@PrepareForTest(Calendar.class)
public class XXXXXX {

In your test method:

PowerMockito.mockStatic(Calendar.class);
    Calendar calendar = mock(Calendar.class);
    when(calendar.get(eq(Calendar.HOUR_OF_DAY))).thenReturn(3);

    Mockito.when(Calendar.getInstance()).thenReturn(calendar);

Solution 2

Mockito doesn't support mocking a final class.Have a look at PowerMock.It allows you to mock static methods and classes. It can work with Mockito, documentation explains how to do that.

Comments

[anergy]

doesn't matter, Mockito cant mock Final classes

[user962206]

so you mean it is mocking a final class? I thought it is just calling the static method of a final class

[niaomingjian]

What if my class has annotated with @RunWith(Theories.class)?