components/FlexibleHeader/tests/unit/FlexibleHeaderStatusBarTests.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.MaterialFlexibleHeader

// Testing status bar-related functionality.
class FlexibleHeaderStatusBarTests: XCTestCase {

  func testDarkBackgroundColor() {
    let controller = MDCFlexibleHeaderViewController()
    let view = controller.headerView
    view.backgroundColor = UIColor.black
    XCTAssertEqual(controller.preferredStatusBarStyle, UIStatusBarStyle.lightContent)
  }

  func testLightBackgroundColor() {
    let controller = MDCFlexibleHeaderViewController()
    let view = controller.headerView
    view.backgroundColor = UIColor.white
    #if swift(>=5.1)
      if #available(iOS 13, *) {
        XCTAssertEqual(controller.preferredStatusBarStyle, UIStatusBarStyle.darkContent)
      } else {
        XCTAssertEqual(controller.preferredStatusBarStyle, UIStatusBarStyle.default)
      }
    #else
      XCTAssertEqual(controller.preferredStatusBarStyle, UIStatusBarStyle.default)
    #endif
  }

  func testNonOpaqueBackgroundColor() {
    let controller = MDCFlexibleHeaderViewController()
    let view = controller.headerView
    view.backgroundColor = UIColor.init(white: 0, alpha: 0)
    XCTAssertEqual(controller.preferredStatusBarStyle, UIStatusBarStyle.default)
  }

  func testExplicitStyleWhenDefault() {
    let controller = MDCFlexibleHeaderViewController()
    controller.inferPreferredStatusBarStyle = false
    controller.preferredStatusBarStyle = .default
    XCTAssertEqual(controller.preferredStatusBarStyle, .default)
  }

  func testExplicitStyleWhenLightContent() {
    let controller = MDCFlexibleHeaderViewController()
    controller.inferPreferredStatusBarStyle = false
    controller.preferredStatusBarStyle = .lightContent
    XCTAssertEqual(controller.preferredStatusBarStyle, .lightContent)
  }

}