Jest.js 强制窗口未定义 [英] Jest.js force window to be undefined

问题描述

我正在使用 jest + 酶设置进行测试.如果定义了窗口，我有有条件地呈现某些东西的函数.

在我的测试套件中，当未定义窗口时，我试图达到第二种情况，但我不能强制它.

<前>it('当窗口未定义时产生一些东西', () => {窗口 = 未定义；期望(myFunction()).toEqual(thisWhatIWantOnUndefinedWinow);});

但即使我强制窗口未定义，它也不会达到预期的情况，窗口始终是窗口(jsdom?)

这与我的笑话设置有关还是我应该以另一种方式处理?

解决方案

我能够使用以下模式测试未定义 window 的场景.它允许您在同一个文件中使用和不使用 window 运行测试.不需要在文件顶部添加@jest-environment node.

describe('当窗口未定义时', () => {const { 窗口 } = 全局；beforeAll(() => {//@ts-忽略删除 global.window;});afterAll(() => {global.window = 窗口；});it('运行没有错误', () => {...});});

I'm working with jest + enzyme setup for tests. I have function that conditionally renders something if window is defined.

In my test suite I'm trying to reach second case, when window is not defined, but I can't force it.

    it('makes something when window is not defined', () => {
       window = undefined;
       expect(myFunction()).toEqual(thisWhatIWantOnUndefinedWinow);
    });

But even if I force window to be undefined, it doesn't reach expected case, window is always window (jsdom?)

Is it something with my jest setup or I should handle this another way?

解决方案

I am able to test the scenario where window is undefined using the below pattern. It allows you to run tests with and without window in the same file. Adding @jest-environment node at the top of the file is not required.

describe('when window is undefined', () => {
    const { window } = global;
    beforeAll(() => {
      // @ts-ignore
      delete global.window;
    });
    afterAll(() => {
      global.window = window;
    });
    
    it('runs without error', () => {
      ...
    });
});

    

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