UnitTestFromRealProject.kt

    @Test
    fun `Should show search button when internet connection is reappeared`() {
        val testInternetConnectionEmitter = TestObservableEmitter(true)
        every { filtersInteractor.getFilters() } returns Single.just(filters)
        every { priceNotificationsInteractor.getNotificationsFromInMemory() } returns Observable.just(priceNotifications)
        every { networkConnectionChecker.isInternetAvailable() } returns Observable.create(testInternetConnectionEmitter)
        
        val viewModel = createViewModel()
        testScheduler.triggerActions()
        clearMocks(screenState)

        // Internet connections is disappeared
        testInternetConnectionEmitter.emitter?.onNext(false) // Code duplication!
        testScheduler.triggerActions()  // Code duplication!
        
        // User hides search
        viewModel.hideSearchAction.accept()  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!
            
        // Internet connection appears
        testInternetConnectionEmitter.emitter?.onNext(true)  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!
        
        clearMocks(screenState)
        
        // User clicks on retry button
        viewModel.retryClickedAction.accept()
        testScheduler.triggerActions()
        
        verify(exactly = 1) { screenState.showSearchButton() }
    }
    
    @Test
    fun `Should search items after reappearing internet connection`() {
        val testInternetConnectionEmitter = TestObservableEmitter(true)
        every { filtersInteractor.getFilters() } returns Single.just(filters)
        every { priceNotificationsInteractor.getNotificationsFromInMemory() } returns Observable.just(priceNotifications)
        every { networkConnectionChecker.isInternetAvailable() } returns Observable.create(testInternetConnectionEmitter)

        val viewModel = createViewModel()
        testScheduler.triggerActions()
        clearMocks(screenState)

        // User searches for Apple
        viewModel.searchInputAction.accept("Apple")  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!

        // Internet connections is disappeared
        testInternetConnectionEmitter.emitter?.onNext(false)  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!

        //User hides Search view
        viewModel.hideSearchAction.accept()  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!

        //Internet connection is appeared
        testInternetConnectionEmitter.emitter?.onNext(true)  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!

        // User clicks on retry button
        viewModel.retryClickedAction.accept()  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!

        // User searches for Apple again
        viewModel.searchInputAction.accept("Apple")  // Code duplication!
        testScheduler.triggerActions()  // Code duplication!

        clearMocks(screenState)

        verify(exactly = 1) {
            screenState.showNotificationsAndFilters(filters, PriceNotificationsFilter.Active, activePriceNotifications)
        }
        verify(exactly = 0) { screenState.showUnknownErrorState() }
        verify(exactly = 0) { screenState.showLoadingState() }
        verify(exactly = 0) { screenState.showNoNotificationsAtAllState() }
        verify(exactly = 0) { screenState.showNoInternetConnectionState() }
        verify(exactly = 0) { screenState.showNoNotificationsForFilterState(any(), any()) }
        verify(exactly = 0) { screenState.showNoNotificationsForSearch(any(), any()) }
    }