StubExample.kt

@Test
fun `Retrieve notes count from server when requested`() {
    val notesApiStub = //Stub
    val note = //Dummy
    val noteRepository = NoteRepository(notesApiStub) //System under test

    //Stub configuration. Hard-coded value returned will be a list with 2 entries.
    //This method is going to be called by noteRepository.getNoteCount()
    every { notesApiStub.fetchAllNotes() } returns listOf(note, note)

    val allNotes = noteRepository.getNotes()

    assertEquals(expected = 2, actual = allNotes.size)
}