Coroutine/suspend function mocking support

If you use non-inline lambdas that are not declared as suspend, the runBlocking { } around the test function doesn’t help, rather we need to mock { on { runBlocking { suspendFun() } } } for each mock…

[nhaarman]

I don’t really use coroutines much myself. I can suggest this solution:

fun <T : Any, R> KStubbing<T>.onBlocking(
      m: suspend T.() -> R
): OngoingStubbing<R> {
    return runBlocking { Mockito.`when`(mock.m()) }
}

… but I don’t know if it covers all scenarios. The following test passes:

interface SomeInterface {

    suspend fun foo(): Int
}

@Test
fun test() = runBlocking {
    val m = mock<SomeInterface> {
        onBlocking { foo() } doReturn 42
    }

    val result = m.foo()

    expect(result).toBe(42)
}

[juanchosaravia]

Pointing to this version I was able to use directly the onBlocking function: “com.nhaarman.mockitokotlin2:mockito-kotlin:2.0.0-alpha04”

I tried using latest version: “com.nhaarman.mockitokotlin2:mockito-kotlin:2.0.0-RC1” but onBlocking is not available anymore and I don’t know if there is another function that is replacing this.