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

我试过一个类似的测试，对我很有效……

我的代码:

export const Blah = () => {
        const BLAH = 'https://www.google.com/'
        const handleBlah = () => {
            window.open(BLAH, '_blank')
        }

    return (
        <button onClick={handleBlah}> BLAHBLAH </button>
    )
}

我的测试使用Jest:

it('should be able to render "BLAHBLAH " button ', () => {
    window.open = jest.fn();
    const BLAH = 'https://www.google.com/'
    const { getByText } = render(<Blah/>) // Get text by my page Blah
    const buttonGoToBlah = getByText('BLAHBLAH') // Get button by text
    fireEvent.click(buttonGoToBlah) // Simulate the click event

    expect(window.open).toHaveBeenCalledTimes(1) // Expect the window.open have to been called at least once.
    expect(window.open).toHaveBeenCalledWith(BLAH, '_blank'); // And the page should be the same called in my BLAH page
})

2021-09-28 14:40:10

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

试一试:

let windowOpenSpy: jest.SpyInstance;
beforeEach(() => {
    windowOpenSpy = jest.spyOn(window, 'open');
});

it('should open window with dashboard url', () => {
    expect(windowOpenSpy).toBeCalledWith('your URL', '_blank');
});

2021-08-25 08:03:59

我试过一个类似的测试，对我很有效……

我的代码:

export const Blah = () => {
        const BLAH = 'https://www.google.com/'
        const handleBlah = () => {
            window.open(BLAH, '_blank')
        }

    return (
        <button onClick={handleBlah}> BLAHBLAH </button>
    )
}

我的测试使用Jest:

it('should be able to render "BLAHBLAH " button ', () => {
    window.open = jest.fn();
    const BLAH = 'https://www.google.com/'
    const { getByText } = render(<Blah/>) // Get text by my page Blah
    const buttonGoToBlah = getByText('BLAHBLAH') // Get button by text
    fireEvent.click(buttonGoToBlah) // Simulate the click event

    expect(window.open).toHaveBeenCalledTimes(1) // Expect the window.open have to been called at least once.
    expect(window.open).toHaveBeenCalledWith(BLAH, '_blank'); // And the page should be the same called in my BLAH page
})

2021-09-28 14:40:10

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

你可以测试它:

describe('TableItem Components', () => {
    let open_url = ""
    const { open } = window;
    beforeAll(() => {
        delete window.open;
        window.open = (url) => { open_url = url };
    });
    afterAll(() => {
        window.open = open;
    });
    test('string type', async () => {
        wrapper.vm.openNewTab('http://example.com')
        expect(open_url).toBe('http://example.com')
    })
})

2021-01-31 06:03:43

我如何使用Jest模拟JavaScript的“窗口”对象?

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