PeopleListTest#impl.kt

val presenter = PeopleListPresenter(repository)

on("presenter attach"){
    presenter.attach(view)
    it("should attach view"){
        assertNotNull(presenter.view)
    }
    it("should start loading") {
        verify(view).showLoading()
    }
    it("should load list into view"){
        verify(view).addPeople(peopleList)
    }
    it("should stop loading") {
        verify(view).hideLoading()
    }
    it("should never show any error"){
        verify(view, never()).showError(anyOrNull())
    }
}
on("presenter detach"){
    it("should detach view"){
    presenter.detach()
        assertNull(presenter.view)
    }
}