使用 Jest 测试来自 react-router v4 的链接 [英] Using Jest to test a Link from react-router v4

问题描述

我正在使用 jest 来测试带有来自 react-router v4 的 的组件.

I'm using jest to test a component with a <Link> from react-router v4.

我收到一个警告，提示 需要来自 react-router 组件的上下文.

I get a warning that <Link /> requires the context from a react-router <Router /> component.

如何在测试中模拟或提供路由器上下文?(基本上我该如何解决这个警告?)

How can I mock or provide a router context in my test? (Basically how do I resolve this warning?)

Link.test.js

import React from 'react';
import renderer from 'react-test-renderer';
import { Link } from 'react-router-dom';

test('Link matches snapshot', () => {
  const component = renderer.create(
    <Link to="#" />
  );

  let tree = component.toJSON();
  expect(tree).toMatchSnapshot();
});

测试运行时的警告:

Warning: Failed context type: The context `router` is marked 
as required in `Link`, but its value is `undefined`.

推荐答案

您可以在测试中使用 StaticRouter 包装您的组件，以将路由器上下文放入您的组件中:

You can wrap your component in the test with the StaticRouter to get the router context into your component:

import React from 'react';
import renderer from 'react-test-renderer';
import { Link } from 'react-router-dom';
import { StaticRouter } from 'react-router'

test('Link matches snapshot', () => {
  const component = renderer.create(
    <StaticRouter location="someLocation" context={context}>
      <Link to="#" />
    </StaticRouter>
  );

  let tree = component.toJSON();
  expect(tree).toMatchSnapshot();
});

查看 react 路由器 有关测试的文档

Have a look at the react router docs about testing

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