Question

这是我第一次进行单元测试，需要一些帮助来理解为什么会出现以下错误。

A）TestingLibraryElementError：无法找到带有文本的元素：访问我的页面。这可能是因为文本被多个元素分解了。在这种情况下，您可以为文本匹配器提供一个功能，以使匹配器更加灵活。

B）期望（接收）.toBeInTheDocument（）

接收到的值必须是HTMLElement或SVGElement。收到的值：nulL

c）TestingLibraryElementError：无法通过以下方式找到元素：[data-testid =“ aboutLink”]

这是我在AModal.test.tsx中进行的测试

 import React from "react";
import AboutModal from "../../components/AModel";
import { render, screen, fireEvent, getByTestId } from "@testing-library/react";

describe("About Modal", () => {
  it("loads", () => {
    render(<AboutModal />, {});
    // Make sure the pop up has loaded
    expect(screen.queryByText("Welcome")).toBeInTheDocument();
  });
  it("Checks if link works", () => {
// expect(
    //   screen.queryByText("Visit the About Page for more info")
    // ).toBeInTheDocument();  ERROR B is coming here
    const { container } = render(<AboutModal />, {});
    fireEvent(getByTestId(container, "aboutLink"), new MouseEvent("click")); // Error C is coming here
    expect(screen.queryByText("About my document")).toBeInTheDocument();
  });
});

这是来自AModel.tsx组件类的代码。

     import { Typography, Button, Modal } from "antd";
import React, { useState, useEffect } from "react";
import styles from "./MyModal.module.scss";
import { RightOutlined } from "@ant-design/icons";
import cookie from "react-cookies";
import Link from "next/link";

const MyModal: React.FC = () => {
  const [visible, setVisible] = useState(false);
  const { Text } = Typography;
  const hide = () => {
    setVisible(false);
  };

  const handleVisibleChange = () => {
    setVisible(true);
  };

  useEffect(() => {
    const hasVisitedBefore = cookie.load("hasVisitedBefore");
    if (cookie && !hasVisitedBefore) {
      setVisible(true);
      cookie.save("hasVisitedBefore", "true", {});
    }
  }, []);

  const content = () => {
    return (
      <div className={styles.popupcontainer}>
        <div className={styles.popupcontent}>
          <p>Learning Jest?</p>
          
        </div>
        <div className={styles.footer} data-testid="aboutLink">
          <Link href="/about">
            <a>
              <Text strong>
                Visit the About Page for more info <RightOutlined />
              </Text>
            </a>
          </Link>
        </div>
      </div>
    );
  };

  const popUpTitle = <span className={styles.popuptitle}>Welcome</span>;

  return (
    <>
      <Modal
        title={popUpTitle}
        centered
        mask={false}
        className={styles.mystyle}
        bodyStyle={{ overflow: "auto" }}
        onCancel={hide}
        footer={null}
        visible={visible}
      >
        {content()}
      </Modal>
    </>
  );
};

导出默认的MyModal;

对此有任何帮助。.

谢谢

Answer 1

请尝试以下操作 -

const {getByTestId} = render(<AboutModal />, {});
fireEvent.click(getByTestId("aboutLink"));

单元测试因找不到元素而失败

1 个答案: