Error: Unable to find an element with the text when I try a test with Jest in React

Question

我是测试新闻，se，这是我的问题

我有那个简单的登录组件：

import React, { useState } from "react";

export default function Login() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");

  function handleLogin(event) {
    event.preventDefault();
    console.log(email, password);
  }

  return (
    <form data-testid="login-form" onSubmit={handleLogin}>
      <input
        data-testid="useremail"
        type="email"
        placeholder="Email"
        value={email}
        onChange={event => setEmail(event.target.value)}
      />

      <input
        data-testid="userpassword"
        type="password"
        placeholder="Password"
        value={password}
        onChange={event => setPassword(event.target.value)}
      />
      <button onClick={handleLogin}>login</button>
    </form>
  );
}

这里是我的测试尝试：

import React from "react";
import Login from "../pages/Login";

import { render, fireEvent } from "@testing-library/react";

describe("Login component", () => {
  it("user sent email and password", () => {
    const username = "user@gmail.com";
    const password = "123456";

    let { getByText, getByTestId } = render(<Login />);

    fireEvent.change(getByTestId("useremail"), {
      target: { value: username }
    });

    fireEvent.change(getByTestId("userpassword"), {
      target: { value: password }
    });

    fireEvent.submit(getByTestId("login-form"));

    expect(getByTestId("login-form")).toContainElement(
      getByText(username, password)
    );
  });
});

returns 的错误：无法找到包含文本的元素：user@gmail.com。这可能是因为文本被多个元素打断了。在这种情况下，您可以为您的文本匹配器提供一个函数，使您的匹配器更加灵活。

Answer 1

getByText 看起来 by text content。 value 属性不是文本内容，只是属性之一。所以它不会通过这种方法找到输入。

此外，按要断言的事物进行搜索有点不习惯。最好通过它的静态属性找到元素，然后检查动态值：

expect(getByTestId("useremail").value).toEqual("user@gmail.com");

PS 更 "RTL-approach" 我还建议使用 getByPlaceholderText 而不是 getByTestId.

Error: Unable to find an element with the text when I try a test with Jest in React

Error: Unable to find an element with the text when I try a test with Jest in React

reactjs

testing

jestjs

tdd

react-testing-library