ArunYogeshwaran

// A test with relevant details abstracted out.
@Test
fun `get ML recommended jobs with new user expect predefined list`() {
   // Test arrangements and setup.

   val engine = new RecommendationEngine(getEnvDetails(), getLocalInfo(), getSessionProperties())
   val jobs = engine.getJobs(getTestUserInfo())
   assertThat(jobs).isEqualTo(expectedJobs)
}

ArunYogeshwaran

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

// A unit test using interaction testing.

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

// The condition here is that the private method is made public or package-private using the `VisibleForTesting` annotation.
@Test
fun `is referral valid with new referral expected value is true`() {
   val friendReferral = getInstance()
   asserTrue(friendReferral.isReferralValid(…))
}

// The condition here is that the private method is made public or package-private using the `VisibleForTesting` annotation.
@Test
fun `process referral valid with new referral verify referral successful`() {

ArunYogeshwaran

@Test
fun `refer friend with new referral verify referral successful`() {
   val friendReferral = getInstance()
   friendReferral.referFriend("testUserId", getStaleReferral())
   assertThat(referralList.contains("testUserId")).isTrue()
}

@Test
fun `refer friend with stale referral verify referral failue`() {
   val friendReferral = getInstance()

ArunYogeshwaran

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