Mockito Exception - when() requires an argument which has to be a method call on a mock

Question

I have a very simple test case that is using Mockito and Spring Test framework. When I do

when(pcUserService.read(\"1\")).thenReturn(pcUser);

Answer 1

Another solution to this issue might be that in case of a test class that is using PowerMockRunner, you might have to add the class that you are mocking to the list, in @PrepareForTest annotation.

For instance -

@PrepareForTest({ PcUserService.class })

Answer 2

You need to create a MOCK of pcUserService first, and then use that mock.

PcUserService mock = org.mockito.Mockito.mock(PcUserService.class);
when(mock.read("1")).thenReturn(pcUser);

Answer 3

If you use Kotlin, you should know that methods are final by default. So write open fun instead of fun. Thanks to @djkelly99 for a tip.

Answer 4

In case others hit this issue....

It could also be the case that the method you are trying to mock out,pcUserService.read, is declared as a final method. From what I've noticed this appears to cause issues with Mockito.

Answer 5

In my case it was solved by injecting @MockBean.

For ex.

@MockBean
StateRepository mockStateRepository;

Answer 6

For the help of others who stuck with the same problem;

The method you are trying to mock , pcUserService.read, is declared as a final method. Static methods appears to cause issues with Mockito.