front_end/testing/test_setup.ts

// Copyright 2020 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.

/*
 * This file is automatically loaded and run by Karma because it automatically
 * loads and injects all *.js files it finds.
 */

import * as Common from '../core/common/common.js';
import * as Host from '../core/host/host.js';
import * as Root from '../core/root/root.js';
import * as Trace from '../models/trace/trace.js';
import * as Timeline from '../panels/timeline/timeline.js';
import * as ThemeSupport from '../ui/legacy/theme_support/theme_support.js';

import {cleanTestDOM, setupTestDOM} from './DOMHelpers.js';
import {createFakeSetting, resetHostConfig} from './EnvironmentHelpers.js';
import {
  checkForPendingActivity,
  startTrackingAsyncActivity,
  stopTrackingAsyncActivity,
} from './TrackAsyncOperations.js';

const style = document.createElement('style');
style.innerText =
    '@import url(\'https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100..900;1,100..900&display=swap\');';
document.head.append(style);
document.documentElement.classList.add('platform-screenshot-test');

beforeEach(async () => {
  resetHostConfig();
  await setupTestDOM();
  // Ensure that no trace data leaks between tests when testing the trace engine.
  for (const handler of Object.values(Trace.Handlers.ModelHandlers)) {
    handler.reset();
  }
  Trace.Helpers.SyntheticEvents.SyntheticEventsManager.reset();
  Timeline.Utils.SourceMapsResolver.SourceMapsResolver.clearResolvedNodeNames();

  // Don't retain host binding listeners across tests. Set this up before initializing ThemeSupport as
  // ThemeSupport adds a host binding listener.
  Host.InspectorFrontendHost.InspectorFrontendHostInstance.events = new Common.ObjectWrapper.ObjectWrapper();

  // Some unit tests exercise code that assumes a ThemeSupport instance is available.
  // Run this in a beforeEach in case an individual test overrides it.
  const setting = createFakeSetting('theme', 'default');
  ThemeSupport.ThemeSupport.instance({forceNew: true, setting});

  startTrackingAsyncActivity();
});

afterEach(async () => {
  for (const key of Object.keys(Root.Runtime.hostConfig)) {
    // @ts-expect-error
    delete Root.Runtime.hostConfig[key];
  }
  await cleanTestDOM();
  await checkForPendingActivity();
  resetHostConfig();
  sinon.restore();
  stopTrackingAsyncActivity();
  // Clear out any Sinon stubs or spies between individual tests.
});