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);

在Jest中有几种方法可以模拟全局变量:

Use the mockImplementation approach (the most Jest-like way), but it will work only for those variables which has some default implementation provided by jsdom. window.open is one of them: test('it works', () => { // Setup const mockedOpen = jest.fn(); // Without making a copy, you will have a circular dependency problem const originalWindow = { ...window }; const windowSpy = jest.spyOn(global, "window", "get"); windowSpy.mockImplementation(() => ({ ...originalWindow, // In case you need other window properties to be in place open: mockedOpen })); // Tests statementService.openStatementsReport(111) expect(mockedOpen).toBeCalled(); // Cleanup windowSpy.mockRestore(); }); Assign the value directly to the global property. It is the most straightforward, but it may trigger error messages for some window variables, e.g. window.href. test('it works', () => { // Setup const mockedOpen = jest.fn(); const originalOpen = window.open; window.open = mockedOpen; // Tests statementService.openStatementsReport(111) expect(mockedOpen).toBeCalled(); // Cleanup window.open = originalOpen; }); Don't use globals directly (requires a bit of refactoring) Instead of using the global value directly, it might be cleaner to import it from another file, so mocking will became trivial with Jest.

文件。/ . js

jest.mock('./fileWithGlobalValueExported.js');
import { windowOpen } from './fileWithGlobalValueExported.js';
import { statementService } from './testedFile.js';

// Tests
test('it works', () => {
  statementService.openStatementsReport(111)
  expect(windowOpen).toBeCalled();
});

文件。/ fileWithGlobalValueExported.js

export const windowOpen = window.open;

文件。/ testedFile.js

import { windowOpen } from './fileWithGlobalValueExported.js';
export const statementService = {
  openStatementsReport(contactIds) {
    windowOpen(`a_url_${contactIds}`);
  }
}

在Jest配置中，添加setupFilesAfterEnv: ["./setupTests.js"]，创建该文件，并添加您想要在测试之前运行的代码:

// setupTests.js
window.crypto = {
   .....
};

参考:setupFilesAfterEnv [array]

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);

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
  });
});

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();