components/NavigationBar/tests/unit/NavigationBarButtonTitleFontTests.swift

/*
 Copyright 2018-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.MaterialNavigationBar
import MaterialComponents.MaterialButtons

class NavigationBarButtonTitleFontTests: XCTestCase {

  var navigationBar: MDCNavigationBar!

  override func setUp() {
    navigationBar = MDCNavigationBar()
  }

  private func recursiveSubviews(of superview: UIView) -> [UIView] {
    var subviews = superview.subviews
    for subview in superview.subviews {
      subviews.append(contentsOf: recursiveSubviews(of: subview))
    }
    return subviews
  }

  func testDefaultFontBehavior() {
    // Given
    navigationBar.leadingBarButtonItems = [
      UIBarButtonItem(title: "Text", style: .plain, target: nil, action: nil)
    ]
    navigationBar.trailingBarButtonItems = [
      UIBarButtonItem(title: "Text 2", style: .plain, target: nil, action: nil)
    ]

    // Then
    for view in recursiveSubviews(of: navigationBar) {
      if let button = view as? MDCButton {
        XCTAssertNil(button.titleFont(for: .normal))
      }
    }
  }

  func testCustomFontIsSetForNewButtons() {
    // Given
    let font = UIFont.systemFont(ofSize: 100)

    // When
    navigationBar.setButtonsTitleFont(font, for: .normal)
    navigationBar.leadingBarButtonItems = [
      UIBarButtonItem(title: "Text", style: .plain, target: nil, action: nil)
    ]
    navigationBar.trailingBarButtonItems = [
      UIBarButtonItem(title: "Text 2", style: .plain, target: nil, action: nil)
    ]

    // Then
    for view in recursiveSubviews(of: navigationBar) {
      if let button = view as? MDCButton {
        XCTAssertEqual(button.titleFont(for: .normal), font)
        XCTAssertEqual(button.titleLabel?.font, font)
      }
    }
  }

  func testCustomFontIsSetForExistingButtons() {
    // Given
    let font = UIFont.systemFont(ofSize: 100)

    // When
    navigationBar.leadingBarButtonItems = [
      UIBarButtonItem(title: "Text", style: .plain, target: nil, action: nil)
    ]
    navigationBar.trailingBarButtonItems = [
      UIBarButtonItem(title: "Text 2", style: .plain, target: nil, action: nil)
    ]
    navigationBar.setButtonsTitleFont(font, for: .normal)

    // Then
    for view in recursiveSubviews(of: navigationBar) {
      if let button = view as? MDCButton {
        XCTAssertEqual(button.titleFont(for: .normal), font)
        XCTAssertEqual(button.titleLabel?.font, font)
      }
    }
  }

  func testCustomFontFallbackBehavior() {
    // Given
    let normalFont = UIFont.systemFont(ofSize: 100)
    let selectedFont = UIFont.systemFont(ofSize: 50)

    // When
    navigationBar.setButtonsTitleFont(normalFont, for: .normal)
    navigationBar.setButtonsTitleFont(selectedFont, for: .selected)
    navigationBar.leadingBarButtonItems = [
      UIBarButtonItem(title: "Text", style: .plain, target: nil, action: nil)
    ]
    navigationBar.trailingBarButtonItems = [
      UIBarButtonItem(title: "Text 2", style: .plain, target: nil, action: nil)
    ]

    // Then
    for view in recursiveSubviews(of: navigationBar) {
      if let button = view as? MDCButton {
        button.isSelected = true

        XCTAssertEqual(button.titleLabel?.font, selectedFont)

        button.isSelected = false

        XCTAssertEqual(button.titleLabel?.font, normalFont)
      }
    }
  }
}