/**
 * @fileoverview Test for Document Events Handler
 *
 * @license
 * Copyright 2020 Google LLC
 *
 * 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
 *
 *   https://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 'jasmine';
import {DocumentEventsFlushingStrategy} from './document_events';

describe('DocumentEventsFlushingStrategy', () => {
  let documentHandler : DocumentEventsFlushingStrategy;
  let mockflushEventsDelegate : () => void;

  beforeEach(() => {
    documentHandler = new DocumentEventsFlushingStrategy();
    mockflushEventsDelegate = jasmine.createSpy('flushEventsDelegate');
  });

  it('startBatching should add pagehide event listener', () => {
    spyOn(document, 'addEventListener');
    documentHandler.startBatching(mockflushEventsDelegate);
    expect(document.addEventListener).toHaveBeenCalledWith('pagehide', mockflushEventsDelegate);
  });

  it('stopBatching should remove pagehide event listener', () => {
    spyOn(document, 'removeEventListener');
    documentHandler.stopBatching(mockflushEventsDelegate);
    expect(document.removeEventListener).toHaveBeenCalledWith('pagehide', mockflushEventsDelegate);
  });
});