phellipealexandre

interface NoteApi {
    suspend fun uploadNote(note: Note): Result
    suspend fun fetchAllNotes(): List<Note>
}

class RealNoteApi : NoteApi {
    override suspend fun uploadNote(note: Note): Result {
        //Real implementation
    }

phellipealexandre

interface NoteApi {
    suspend fun uploadNote(note: Note): Result
    suspend fun fetchAllNotes(): List<Note>
}

class RealNoteApi: NoteApi {
    override suspend fun uploadNote(note: Note): Result {
        //Real impl
    }

phellipealexandre

@Test
fun `Track analytics event when creating new note`() {
    val analyticsWrapperMock = mockk<AnalyticsWrapper>() //Mock Double
    val noteAnalytics = NoteAnalytics(analyticsWrapperMock)

    noteAnalytics.trackNewNoteEvent(NoteType.Supermarket)

    //Observes that specific operation has happened
    verify(exactly = 1) { analyticsWrapperMock.logEvent("NewNote", "SuperMarket") }
}

phellipealexandre

@Test
fun `Retrieve notes count from server when requested`() {
    val notesApiStub = mockk<NotesApi>() //Stub Double
    val noteRepository = NoteRepository(notesApiStub)
    val note = generateDummyNote() //Dummy Double
    every { notesApiStub.fetchAllNotes() } returns listOf(note, note)

    val allNotesCount = noteRepository.getNoteCount()

    assertEquals(expected = 2, actual = allNotesCount)

phellipealexandre

@Test
fun `Track analytics event when creating new note`() {
    val analyticsWrapperSpy = //Spy
    val noteAnalytics = NoteAnalytics(analyticsWrapperSpy) //System under test

    //AnalyticsWrapperSpy records the interaction with NoteAnalytics under the hoods
    noteAnalytics.trackCreateNewNoteEvent(NoteType.Supermarket)

    //Based on the its internal implementation, the spy returns the state of the dependency
    val numberOfEvents = analyticsWrapperSpy.getNewNoteEventsRegistered()

phellipealexandre

@Test
fun `Track analytics event when creating new note`() {
    val analyticsWrapperMock = //Mock
    val noteAnalytics = NoteAnalytics(analyticsWrapperMock) //System under test

    noteAnalytics.trackNewNoteEvent(NoteType.Supermarket)

    //Verifies that specific call has happened
    verify(exactly = 1) { analyticsWrapperMock.logEvent("NewNote", "SuperMarket") }
}

phellipealexandre

@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()

phellipealexandre

@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)

phellipealexandre

//----- Literal dummy -----
val dummyPrice = 10.0 

//----- Generated dummy -----
val dummyCustomer = CustomerTestBuilder.build() 

//----- Alternative empty implementation -----
val dummyNote = DummyNote() 

class DummyNote(): Note //No implementation  

phellipealexandre

@Test
fun `Update registered note count when registering a new note in empty repository`() {
    val dummyNote = //Dummy
    
    noteRepository.registerNote(dummyNote) //Just filling the parameter, the double's content is not relevant for the test
    val allNotes = noteRepository.getNotes()

    assertEquals(expected = 1, actual = allNotes.size)
}