我如何使用Jest模拟JavaScript的“窗口”对象?

我需要测试一个在浏览器中打开一个新选项卡的功能

openStatementsReport(contactIds) {
  window.open(`a_url_${contactIds}`);
}

我想模拟窗口的打开函数，这样我就可以验证正确的URL被传递给打开函数。

使用笑话，我不知道如何模拟窗口。我试着设置窗口。使用mock函数打开，但这种方式不起作用。下面是测试用例:

it('the correct URL is called', () => {
  window.open = jest.fn();
  statementService.openStatementsReport(111);
  expect(window.open).toBeCalled();
});

但是它给出了误差

expect(jest.fn())[.not].toBeCalled()

jest.fn() value must be a mock function or spy.
    Received:
      function: [Function anonymous]

我应该对测试用例做什么?

当前回答

如果它类似于window.location.href中的窗口位置问题，则不能在测试中更改。#890，你可以尝试(调整):

delete global.window.open;
global.window = Object.create(window);
global.window.open = jest.fn();

2019-08-22 15:01:48

其他回答

使用global而不是window:

it('the correct URL is called', () => {
  global.open = jest.fn();
  statementService.openStatementsReport(111);
  expect(global.open).toBeCalled();
});

你也可以试试:

const open = jest.fn()
Object.defineProperty(window, 'open', open);

2017-01-27 07:19:39

如果它类似于window.location.href中的窗口位置问题，则不能在测试中更改。#890，你可以尝试(调整):

delete global.window.open;
global.window = Object.create(window);
global.window.open = jest.fn();

2019-08-22 15:01:48

我找到了一个简单的方法:删除和替换

describe('Test case', () => {
  const { open } = window;

  beforeAll(() => {
    // Delete the existing
    delete window.open;
    // Replace with the custom value
    window.open = jest.fn();
    // Works for `location` too, eg:
    // window.location = { origin: 'http://localhost:3100' };
  });

  afterAll(() => {
    // Restore original
    window.open = open;
  });

  it('correct url is called', () => {
    statementService.openStatementsReport(111);
    expect(window.open).toBeCalled(); // Happy happy, joy joy
  });
});

2020-03-13 05:15:14

const windowSpy = jest.spyOn(iFrame, "contentWindow", "get");
windowSpy.mockImplementation(() => ({
  location: {
    origin: "https://test.com",
    href: "href",
    hash: "hash"
  }
}));

2021-09-02 15:56:58

你可以试试这个:

import * as _Window from "jsdom/lib/jsdom/browser/Window";

window.open = jest.fn().mockImplementationOnce(() => {
    return new _Window({ parsingMode: "html" });
});

it("correct url is called", () => {
    statementService.openStatementsReport(111);
    expect(window.open).toHaveBeenCalled();
});

2018-03-01 12:00:51

我如何使用Jest模拟JavaScript的“窗口”对象?

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