components/FlexibleHeader/tests/unit/FlexibleHeaderControllerIssue279Tests.swift

/*
Copyright 2016-present the Material Components for iOS authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import XCTest
import MaterialComponents

// Tests confirming that the flexible header view is always in front of other views when the
// flexible header view is a subview of its tracking scroll view.
//
// Based on issue https://github.com/material-components/material-components-ios/issues/279
class FlexibleHeaderControllerIssue279Tests: XCTestCase {

  var fhvc: MDCFlexibleHeaderViewController!
  var tableViewController: UITableViewController!

  override func setUp() {
    fhvc = MDCFlexibleHeaderViewController()

    tableViewController = UITableViewController()
    tableViewController.addChildViewController(fhvc)
    tableViewController.view.addSubview(fhvc.headerView)

    fhvc.headerView.trackingScrollView = tableViewController.tableView

    fhvc.didMove(toParentViewController: tableViewController)
  }

  func testIsFrontMostView() {
    XCTAssertEqual(tableViewController.tableView.subviews.last, fhvc.headerView)
  }
}