yield

sequence { callback -> foo(callback) }.take(10)

`when`(myObject.myProperty).thenReturn(myValue)
`when`(MyClass::myProperty.get(myObject)).thenReturn(myValue)

class MyTest {
    @Test
    fun ttt() {
        val o = Mockito.mock(C::class.java)
        Mockito.`when`(o.p).thenReturn(99)

        assertEquals(99, o.p)
    }
}

interface C {
    val p: Int
}

class MyTest {
    @Test
    fun ttt() {
        val o = PowerMockito.mock(C::class.java)
        Mockito.`when`(o.p).thenReturn(99)

        assertEquals(99, o.p)
    }
}

class C {
    val p: Int = 0
}

p

fun List<AuthenticatedObject<Command>>.requireSingleCommand(klass: Class<out Command>) = filter { klass.isInstance(it) }.single()