Return Unit

When stubbing a function that returns nothing, MockK provides a few shortcuts.

val logger = mockk<Logger>()
every { logger.log(any()) } returns Unit
every { logger.log(any()) } answers { Unit }
every { logger.log(any()) } just Runs
justRun { logger.log(any()) }

just Runs is the nicest to use, since its shorter than returns and answers and additionally works with coEvery.

coEvery { logger.log(any()) } just Runs