graylog2-server/graylog2-web-interface/src/components/common/Select/CustomMenuList.test.tsx

/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * <http://www.mongodb.com/licensing/server-side-public-license>.
 */
import * as React from 'react';
import { render, screen } from 'wrappedTestingLibrary';

import CustomMenuList from './CustomMenuList';

const getChildrenList = (n: number): React.ReactElement[] => {
  const list = Array(n).fill(null);

  return list.map(() => <div key={Math.random()}>{Math.random()}</div>);
};

describe('CustomMenuList', () => {
  const originalOffsetHeight = Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'offsetHeight');
  const originalOffsetWidth = Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'offsetWidth');

  beforeAll(() => {
    Object.defineProperty(HTMLElement.prototype, 'offsetHeight', { configurable: true, value: 50 });
    Object.defineProperty(HTMLElement.prototype, 'offsetWidth', { configurable: true, value: 50 });
  });

  afterAll(() => {
    Object.defineProperty(HTMLElement.prototype, 'offsetHeight', originalOffsetHeight);
    Object.defineProperty(HTMLElement.prototype, 'offsetWidth', originalOffsetWidth);
  });

  it('Check if List component rendered for number of items more than 1000', () => {
    render(<CustomMenuList>{getChildrenList(1001)}</CustomMenuList>);

    const list = screen.getAllByTestId('react-window-list-item');

    expect(list.length).toBeGreaterThan(0);
  });

  it('Check if List component rendered for number of items less than 1000', () => {
    render(
      <CustomMenuList getStyles={() => ({})} getClassNames={() => ''} cx={() => ''}>
        {getChildrenList(999)}
      </CustomMenuList>,
    );

    const list = screen.getByTestId('react-select-list');

    expect(list).toBeInTheDocument();
  });
});