Jest + Enzyme: How to test an image src?

Question

I have a Logo component:

import React from "react";
import logo from "assets/images/logo.png";

const Logo = () => {
  return <img style={{ width: 50 }} src={logo} alt="logo" />;
};

export default Logo;

Test file:

import React from "react";
import Logo from "components/shared/Logo";

describe("<Logo />", () => {
  it("renders an image", () => {
    const logo = shallow(<Logo />);

    expect(logo.find("img").prop("src")).toEqual("blahh");
  });
});

But when I run the test, there is some weird error:

$ NODE_PATH=src jest
 FAIL  src/tests/Logo.test.js
  ● <Logo /> › renders an image

    TypeError: val.entries is not a function

      at printImmutableEntries (node_modules/expect/node_modules/pretty-format/build/plugins/immutable.js:44:5)
      at Object.<anonymous>.exports.serialize (node_modules/expect/node_modules/pretty-format/build/plugins/immutable.js:178:12)

How am I supposed to test that the image src === "assets/images/logo.png"?

Answer 1

I suppose that you write your tests inside a __test__ directory near Logo components .

Anyway, import your "assets/images/logo.png" relatively to your test file.

if your project structure is like this

Project ├── assets │ └── images ├ | │ └── logo.png ├── src │ └── components ├ |── Logo.js │ └── __tests__ ├ |── logo.test.js └

First, Like I said import image into your logo.test.js by typing:

import React from 'react'; 
import {shallow} from 'enzyme';

import Logo from "./../Logo"; 
import logoImage from "./../../../assets/images/logo.png;

describe("<Logo />", () => {
    it("renders an image", () => {
        const logo = shallow(<Logo />);

        expect(logo.find("img").prop("src")).toEqual(logoImage);

     });
 });