components/AppBar/tests/unit/AppBarContainerIssue272Tests.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

// Tests confirming that MDCAppBarContainerViewController observes the content view controller's
// navigation item.
//
// Based on issue https://github.com/material-components/material-components-ios/issues/272
class AppBarContainerIssue272Tests: XCTestCase {

  var content: UIViewController!
  var container: MDCAppBarContainerViewController!

  override func setUp() {
    super.setUp()

    content = UIViewController()
    container = MDCAppBarContainerViewController(contentViewController: content)
  }

  override func tearDown() {
    container = nil
    content = nil

    super.tearDown()
  }

  func testNotObservedBeforeViewDidLoad() {
    content.navigationItem.title = "Some title"

    XCTAssertNil(container.appBar.navigationBar.title)
    XCTAssertNotEqual(content.navigationItem.title, container.appBar.navigationBar.title)
  }

  func testObservedAfterViewDidLoad() {
    let _ = container.view  // Force the container to load its view
    content.navigationItem.title = "Some title"

    XCTAssertEqual(content.navigationItem.title, container.appBar.navigationBar.title)
  }
}