FakeExample.kt

@Test
fun `Retrieve all notes when requested`() {
    val noteApiFake = FakeNoteApi() //Fake double implementing the same interface as the original
    val noteRepository = NoteRepository(noteApiFake) //System under test 
    val note = //Dummy
    noteApiFake.uploadNote(note) //Configuring the fake
    noteApiFake.uploadNote(note) //Configuring the fake
    
    //Fake with real and lightweight implementation is going to be used under the hoods
    val allNotes = noteRepository.getNotes()

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