void methods #

Mockito’s when method doesn’t work with void methods. To create a stub that doesn’t return anything, the doNothing method is used.

val mockedFile = mock(File::class.java)


MockK doesn’t have any restrictions with these methods, as they return Unit in Kotlin. As a result, the standard returns infix function can be used.

val mockedFile = mockk<File>()

every { mockedFile.write(any()) } returns Unit

MockK also provides the justRun method as a shorthand for every { x } returns Unit. For more information, see the Returning Unit tip.

val mockedFile = mockk<File>()

justRun { mockedFile.write(any()) }
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