CODEWITHSUNDEEP
javascriptnode.jsjestjs
Cerulean
Cerulean

Reputation: 6013

Correct way to import mocked functions from node modules using Jest

I'm learning Jest and it seems like this should be so simple, but I'm missing the forest for the trees and would appreciate some guidance.

I am using Jest to test Express routes. The express routes are in the file /routes/index.js and they each call a corresponding logic function in a file /logic/index.js. routes and logic directories are next to each other, at the same level.

I then put a __mocks__ directory inside of directory logic and create a index.js file inside __mocks__

//  logic/__mocks__/index.js
import clients from '../../../data/clients'

export const getUserForUserName =  (name) => {
 return Promise.resolve(()=> clients.filter(client => client.name === name) )
}

I create a __tests__ directory inside routes and put an index.js file inside it

// routes/__tests_/index.js
jest.mock("../../logic");
import {getUserForUserName} from "../../logic/__mocks__"


    it("gets correct data for user name", async () => {
  const data = await getUserForUserName("Ines");
  expect(data).toEqual([{"email": "[email protected]", "id": "4a0573eb-56d0-45d5-ab36-bebf33c5eb36", "name": "Ines", "role": "admin"}]);
});

Is this the correct way to set this up? The line

import {getUserForUserName} from "../../logic/__mocks__"

seems so 'hardwired' to me, but I suppose it has to be this way. Any suggestions much appreciated.

Upvotes: 0

Views: 30

Answers (1)

Mitch Lillie
Mitch Lillie

Reputation: 2407

You should just be able to import the file without using __mocks__ at all in the path name. Jest will handle resolving to use your mock instead of the actual function.

For example:

// routes/__tests_/index.js
jest.mock("../../logic");
import {getUserForUserName} from "../../logic"

This is in essence the same as the example with "banana" in the docs.

Upvotes: 1

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