ios/chrome/test/root_view_controller_test.mm

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#import "ios/chrome/test/root_view_controller_test.h"

#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif

// Sets the current key window's rootViewController and saves a pointer to
// the original VC to allow restoring it at the end of the test.
void RootViewControllerTest::SetRootViewController(
    UIViewController* new_root_view_controller) {
  original_root_view_controller_ =
      [[[UIApplication sharedApplication] keyWindow] rootViewController];
  [[UIApplication sharedApplication] keyWindow].rootViewController =
      new_root_view_controller;
}

void RootViewControllerTest::TearDown() {
  if (original_root_view_controller_) {
    [[UIApplication sharedApplication] keyWindow].rootViewController =
        original_root_view_controller_;
    original_root_view_controller_ = nil;
  }
  PlatformTest::TearDown();
}