Hi - and another mockk question. Given the followi...

# mockk

[Mario Adam]

Hi - and another mockk question. Given the following properties of a class:

val scanObservers = mutableListOf<(Scan) -> Unit>()
var scan: Scan by Delegates.observable(
        Scan(
            "",
            "",
            ""
        )
    ) { _, _, new -> scanObservers.forEach { it(new) } }

How can I add a mocked lambda in my unit test with mockk?

Some sort of:

@Test
fun verifyObserver() {
  // Arrange
  val scan = Scan("foo", "bar", "baz")
  val myMockedLambda = whatShouldIPutInHere???
  myObj.scanObservers.add(myMockedLambda)

  // Act
  myObj.scan = scan
  
  // Assert
  verify(exactly = 1) { myMockedLambda(scan) }
}

[Matteo Mirk]

val myMockedLambda = mockk<(Scan) -> Unit>()

if you don't want to repeat the lambda type over, declare a type alias

typealias ScanFn = (Scan) -> Unit
val myMockedLambda = mockk<ScanFn>()

[Mario Adam]

many thanks 🙂