[ How to reach to static method from class instance for mock ]

I need to stub Java.util.concurrent.Executors class newFixedThreadPool method and verify it.

    Executors.newFixedThreadPool(executorServiceThreadCount, threadFactory)

I tried create a global Executors value for overriding from test fragment.

    lazy val executors = Executors

But newFixedThreadPool method is not reachable from executors instance. What should i do for stubbing this method. And any best practise for this ? Thanks

Answer 1

You can use PowerMockito to mock static methods. Use the following annotations on top of your test class:

@RunWith(PowerMockRunner.class) @PrepareForTest({Executors.class, ClassYouAreTesting.class})

and use the following code to mock the newFixedThreadPool method:

PowerMockito.mockStatic(Executors.class); Mockito.when(Executors.newFixedThreadPool(5)).thenReturn(mockService);