ExampleTest.kt

 @Test
  fun `An invalid message is sent if a user inputs an invalid password`() {
    val api = mockk<CostarApi>()
    val remoteConfig = mockk<RemoteConfig>()

    every { api.validatePassword(any()) } returns Single.just(Invalid(listOf(PasswordLengthShouldGT6)))
    every { remoteConfig.getString(validation_password_too_short) } returns "Too short"

    val viewModel = buildViewModel(api, remoteConfig = remoteConfig)
    viewModel.newPasswordInput("test")
    viewModel.fabClicked()
    assertEquals("Too short", viewModel.errorMessageLiveData.value)
  }

  @Test
  fun `A loading indicator is shown while a password is being validated`() {
    val api = mockk<CostarApi>()
    val testScheduler = TestScheduler()

    every { api.validatePassword(any()) } returns Single.just(Valid)

    val viewModel = buildViewModel(api, testScheduler.toContainer())

    viewModel.newPasswordInput("valid")
    viewModel.fabClicked()
    assertEquals(true, viewModel.showLoadingLiveData.value)
    testScheduler.triggerActions()
    assertEquals(false, viewModel.showLoadingLiveData.value)
  }

  @Test
  fun `An analytic event is sent when the user submits their password`() {
    val analytics = mockk<Analytics>(relaxed = true)
    val viewModel = buildViewModel(analytics = analytics)

    viewModel.fabClicked()

    verify(exactly = 1) { analytics.logEvent(IncrementalPasswordSubmit) }
  }