面对类型错误: 期望(..).toBeString 在测试 React 应用程序时不是一个函数

Question

我正在测试 React 应用程序并遇到此错误：TypeError: expect(...).toBeString is not a function.我使用的代码是：

import React from "react";
import { configure, shallow } from "enzyme";
import Adapter from "enzyme-adapter-react-16";
import Footer from "../Footer/Footer";
configure({ adapter: new Adapter() });
describe("<About />", () => {
it("Check the type of value", () => {
const props = {
copyright: "Copyright 2019"
};
const wrapper = shallow(<Footer {...props} />);
expect(wrapper.prop("copyright")).toBeString();
});
});

Answer 1

我想你在开玩笑。所以，toBeString不是开玩笑的匹配者。 https://jestjs.io/docs/en/expect