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I tried to test for the component ContactListItem.test.tsx.
ContactListItem.test.tsx

import React from "react";
import { render, screen, RenderResult } from "@testing-library/react";
import userEvent from "@testing-library/user-event";

import ContactListItem from "./index";

import { CONTACTS } from "../../constants/contacts";

const CONTACT_PERSON = CONTACTS[0];

describe("Testing ContactListItem component", () => {
  it("tests the image src and alt;", async () => {
    render(<ContactListItem contact={CONTACT_PERSON} />);
    const img = screen.getByRole("img");
    expect((img as HTMLImageElement).src).toContain(CONTACT_PERSON.iconSrc);
  });
});

contacts.ts

import Avatar_Cat from "src/assets/icons/avatar_cat.jpeg";

export const CONTACTS = [
  {
    id: 3,
    name: "Cat",
    iconSrc: Avatar_Cat,
    iconAlt: "Cat's icon",
    lastMessage: {
      id: 3999,
      time: "2022-01-03",
      message: "Hello World I am Cat"
    }
  }
];

But it shows an error when I run npm test

 FAIL  src/components/ContactListItem/ContactListItem.test.tsx
  ● Test suite failed to run

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

    By default "node_modules" folder is ignored by transformers.

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
     • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/configuration
    For information about custom transformations, see:
    https://jestjs.io/docs/code-transformation

    Details:

    /Users/CCCC/Desktop/SourceTree/my-app/src/assets/icons/avatar_cat.jpeg:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){����
                                                                                      

    SyntaxError: Invalid or unexpected token

    > 1 | import Avatar_Cat from "src/assets/icons/avatar_cat.jpeg";
        | ^


      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1796:14)
      at Object.<anonymous> (src/constants/contacts.ts:1:1)

CodeSandbox
https://codesandbox.io/s/react-typescript-forked-222qbn?file=/src/components/ContactListItem/ContactListItem.test.tsx:0-574

CCCC
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  • Just to clarify, have you followed the steps outlined in the link provided in the error message for Typescript? https://jestjs.io/docs/getting-started#using-typescript – Marcus Jun 28 '22 at 09:42
  • @Marcus yes, you can try the codesandbox file that I create – CCCC Jun 28 '22 at 11:27

0 Answers0