sgl0v

private func startInteractiveTransition(for state: State) {
    state = newState
    runningAnimators = createTransitionAnimators(with: TransitionCoordinator.animationDuration)
    runningAnimators.pauseAnimations()
}

sgl0v

@objc private func didPanPlayer(recognizer: UIPanGestureRecognizer) {
    switch recognizer.state {
    case .began:
        startInteractiveTransition(for: !state) // ➊
    case .changed:
        let translation = recognizer.translation(in: recognizer.view!)
        updateInteractiveTransition(distanceTraveled: translation.y) // ➋
    case .ended:
        let velocity = recognizer.velocity(in: recognizer.view!).y
        let isCancelled = isGestureCancelled(with: velocity)

sgl0v

class TransitionCoordinator {

    enum State: Equatable {
        case open
        case closed

        static prefix func !(_ state: State) -> State {
            return state == .open ? .closed : .open
        }
    }

sgl0v

func test_intialState() {
    // GIVEN /WHEN
    open(viewController: factory.moviesSearchController(navigator: moviesSearchNavigator))

    // THEN
    Page.on(MoviesSearchPage.self)
        .assertScreenTitle("Movies")
        .assertContentIsHidden()
        .on(AlertPage.self)
        .assertTitle("Search for a movie...")

sgl0v

func test_startMoviesSearch_whenTypeSearchText() {
    // GIVEN
    let movies = Movies.loadFromFile("Movies.json")
    networkService.responses["/3/search/movie"] = movies
    open(viewController: factory.moviesSearchController(navigator: moviesSearchNavigator))

    // WHEN
    Page.on(MoviesSearchPage.self).search("joker")

    // THEN

sgl0v

class MoviesSearchPage: Page {

    override func verify() {
        EarlGrey.selectElement(with: grey_accessibilityID(AccessibilityIdentifiers.MoviesSearch.rootViewId)).assert(grey_notNil())
    }
}

// MARK: Actions
extension MoviesSearchPage {

sgl0v

class Page {

    static func on<T: Page>(_ type: T.Type) -> T {
        let pageObject = T()
        pageObject.verify()
        return pageObject
    }

    func verify() {
        fatalError("Override \(#function) function in a subclass!")

sgl0v

private func createTableViewRowsAssert(rowsCount: Int, inSection section: Int) -> GREYAssertion {
    return GREYAssertionBlock(name: "TableViewRowsAssert") { (element, error) -> Bool in
        guard let tableView = element as? UITableView, tableView.numberOfSections > section else {
            return false
        }
        return rowsCount == tableView.numberOfRows(inSection: section)
    }
}

sgl0v

func test_startMoviesSearch_whenTypeSearchText() {
    // GIVEN
    let movies = Movies.loadFromFile("Movies.json")
    networkService.responses["/3/search/movie"] = movies
    open(viewController: factory.moviesSearchController(navigator: moviesSearchNavigator))

    // WHEN
    EarlGrey
        .selectElement(with: grey_accessibilityID(AccessibilityIdentifiers.MoviesSearch.searchTextFieldId))
        .perform(grey_typeText("joker"))

sgl0v

override func setUp() {
    GREYConfiguration.sharedInstance().setValue(false, forConfigKey: kGREYConfigKeyAnalyticsEnabled) ➊
    GREYConfiguration.sharedInstance().setValue(5.0, forConfigKey: kGREYConfigKeyInteractionTimeoutDuration) ➋
    GREYTestHelper.enableFastAnimation() ➌
}