material-components_material-components-ios/components/AppBar/tests/unit/AppBarContainerTests.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.MaterialAppBar

class AppBarContainerTests: XCTestCase {

  func testContainmentAncestry() {
    let contentViewController = UIViewController()
    let appBarContainerViewController =
      MDCAppBarContainerViewController(contentViewController: contentViewController)

    // Content view should not have a parent until the container's view is loaded.
    XCTAssertNil(contentViewController.view.superview)

    // Load the container's view
    XCTAssertNotNil(appBarContainerViewController.view)

    // Ancestry should now be fully-configured
    XCTAssertNotNil(contentViewController.view.superview)
    XCTAssertEqual(contentViewController.parent, appBarContainerViewController)
    XCTAssertTrue(contentViewController.view.isDescendant(of: appBarContainerViewController.view))
  }
}