slot

inline fun <T> slot(): CapturingSlot<T>(source)

Creates new capturing slot.

Slots allow you to capture what arguments a mocked method is called with. When mocking a method using every, pass the slot wrapped with the io.mockk.MockKMatcherScope.capture function in place of a method argument or io.mockk.MockKMatcherScope.any.

Example:

interface FileNetwork {
  fun download(name: String): File
}

val network = mockk<FileNetwork>()
val slot = slot<String>()

every { network.download(capture(slot)) } returns mockk()

network.download("testfile")
// slot.captured is now "testfile"