ApplicationState protocol for XCUITest

ApplicationState.swift

typealias ApplicationState = XCTNSPredicateExpectation
protocol UIElement {
  var existance: ApplicationState { get }
}
extension XCUIElement: UIElement {
  var existance: ApplicationState {
    let state = NSPredicate(format: "exists == true")
    return ApplicationState(predicate: state, object: self)
  }
}
extension Array: UIElement where Element == UIElement {
  var existance: ApplicationState {
    let state = NSPredicate(format: "@count > 0")
    return ApplicationState(predicate: state, object: self)
  }
}