快照测试错误:元素类型无效:需要字符串 [..]

Question

我正在尝试使用 React 和 Joke 进行一些简单的快照测试。

最初我收到此错误：Invariant failed: You should not use <Link> outside a <Router>

阅读此问题后，我更新了我的测试并将我正在测试的组件包装在：<MemoryRouter>...</MemoryRouter>.一旦我这样做了，我就开始收到一个新的错误：Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.我不知道这意味着什么。

我的测试：

import React from "react";
import BookTile from "./BookTile";
import MemoryRouter from "react-router-dom";
import renderer from "react-test-renderer";
test("my test", () => {
let book = {};
const component = renderer.create(
<MemoryRouter>
<BookTile book={book} />
</MemoryRouter>
)
let tree = component.toJSON();
expect(tree).toMatchSnapshot();
})

我正在测试的组件：

import React from "react";
import {Link} from "react-router-dom";
export default function BookTile(props) {
return (
<Link to={`/book/${props.book.id}`}>
<div className="book-tile" style={{'backgroundImage': `url(${process.env.REACT_APP_API_URL}/uploads/${props.book.cover_image_file_name})`}}>
<div className='book-tile-title'>
{props.book.title}
</div>
</div>
</Link>
)
}

Answer 1

您没有正确导入内存路由器。下面是它的外观：

import {MemoryRouter} from 'react-router-dom'