airbnb/caravel

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 handleScroll from '.';

jest.useFakeTimers();
jest.spyOn(global, 'clearInterval');

const { scroll } = window;

afterAll(() => {
  window.scroll = scroll;
});

test('calling: "NOT_SCROLL_TOP" ,"SCROLL_TOP", "NOT_SCROLL_TOP"', () => {
  window.scroll = jest.fn();
  document.documentElement.scrollTop = 500;

  handleScroll('NOT_SCROLL_TOP');

  expect(clearInterval).not.toHaveBeenCalled();

  handleScroll('SCROLL_TOP');

  handleScroll('NOT_SCROLL_TOP');
  expect(clearInterval).toHaveBeenCalledWith(expect.any(Number));
});