ArunYogeshwaran

// Unit under test
fun toggleFavoriteForJob(job: Job) {
  if (job.isFavorite) {
    cache.unfavorite(job)
  } else {
    cache.favorite(job)
  }
}

ArunYogeshwaran

fun playArtist(artist: Artist) {
  if (artist != Artist.TAYLOR_SWIFT) {
    return IllegalArgException()
  }
  addToRecentlyPlayed(artist)
  player.play(artist.getRandomSong())
}

ArunYogeshwaran

// Unit under test
fun fetchJobs(user: User) : List<Job> {
  if (user.isRegistered()) {
      return emptyList()
  } else {
      val jobs = jobsApi.getJobs(user)
      return jobs
  }
}

ArunYogeshwaran

// A test with relevant details right in the test itself
@Test
fun `get ML recommended jobs with new user expect predefined list`() {
  // Test arrangements and setup
  
  val engine = getRecommendationEngine()
  val jobs = engine.getJobs(new User(UserStatus.FAIRLY_NEW, "testId", "Test User Name"))
  assertThat(jobs).isEqualTo(expectedJobs) 
}

ArunYogeshwaran

fun referFriend(userId: String, referral: Referral) {
  if (isReferralValid(referral)) {
      processReferral(userId)
  }
}

private fun isReferralValid(referral: Referral): Boolean {
  // Checks the validity of the referral
}

ArunYogeshwaran

    val viewModel: AuthViewMode by viewModels()
    
    private fun observeState() {
        viewModel.state.observe(
            this,
            { uiState ->
                handleUiState(uiState)
            }
        )
    }

ArunYogeshwaran

/**
 * Represents the UI state of a long running operation.
 */
sealed class UIState<out Int> {
    /**
     * Indicates the operation succeeded.
     */
    object Success : UIState<Nothing>()

    /**

ArunYogeshwaran

    private val repository = UserRepository()
    
    private val _state = MutableLiveData<UIState<Int>?>()
    val state: LiveData<UIState<Int>?> = _state
    
    fun evaluatePassword(password: Long) {
        _state.value = UIState.Loading(R.string.evaluating_creds)
        viewmodelScope.launch(Dispatchers.IO) {
            // This is a long-running operation making network call
            val isSuccess = repository.authenticatUser(password)