问题描述
我有一个 LoginForm
组件,它接受 login
回调并呈现登录表单。
当 login
返回一个被拒绝的承诺时,消息会显示在组件中。
这是我要测试的行为。
我正在使用带有 jest
、enzyme
和 @testing-library/react
的 create-react-app 环境。
我已经在 UI(浏览器)中手动测试了该组件,并确保它可以正常工作并显示消息,但测试无效且最后一个断言失败:
TestingLibraryElementError: Unable to find an element with the text: There was an error.
This Could be because the text is broken up by multiple elements.
In this case,you can provide a function for your text matcher to make your matcher more flexible.
在浏览器中呈现时,我检查了消息,它显示为文字“发生错误”,中间没有任何元素。仅由样式组件包装。 我无法进行测试,有人可以帮忙吗?
我的测试如下:
it("should display error text in login form when login fails",async () => {
const errorText = "There was an error";
const login = jest.fn(() => {
return Promise.reject(errorText);
});
const result = render(<LoginForm login={login} />);
const form = result.container.querySelector("form");
const email = await result.findByLabelText("Email");
const password = await result.findByLabelText("Password");
fireEvent.change(email,{target: {name: "email",value: "1"}});
fireEvent.change(password,{target: {name: "password",value: "1"}});
expect(form).tobedefined();
fireEvent.submit(form!,{});
expect(login).toBeCalledTimes(1);
// This assertion fails
expect(result.getByText(errorText)).toBeInTheDocument();
});
我的组件渲染如下:
render() {
const {error,email,password} = this.state;
return (
<Form novalidate onSubmit={this.onSubmit}>
<InputWrapper>
<Label htmlFor="email">Email</Label>
<InputEmail id="email" name="email" value={email} onChange={this.onChange}/>
</InputWrapper>
<InputWrapper>
<Label htmlFor="password">Password</Label>
<InputPassword id="password" name="password" value={password} onChange={this.onChange}/>
</InputWrapper>
// LoginError is a styled-component
{error && (<LoginError>{error}</LoginError>)}
{this.props.children}
<Button>Login</Button>
</Form>
);
}
解决方法
在 fireEvent.submit(form!,{}); 之后尝试使用 wait 或 waitFor 方法;等待承诺的解决和重新渲染发生。
参考:testing-library.com/docs/dom-testing-library/api-async#waitfor