CODEWITHSUNDEEP
reactjsjestjsmockingreact-hooksreact-router-dom
Zac
Zac

Reputation: 2081

react jest mock useNavigate()

"react-router-dom": "^6.0.0-alpha.5",

I have tried nearly everything.

I just want to mock this navigate() call from the useNavigate() hook. that's it. Simple. Nothing working.

No, i do not want to use Link. useNavigate is used programmatically in other places as well and I want to mock them too

import React from 'react'
import { useNavigate } from "react-router-dom"

export const Detail = () => {
    const navigate = useNavigate();
    return (
        <span onClick={() => navigate('/some/specific/route')}>
            some Text
        </span>
    )
}

I have tried these:

jest.mock('react-router-dom', () => {
    // Require the original module to not be mocked...
    const originalModule = jest.requireActual('react-router-dom');

    return {
        __esModule: true,
        ...originalModule,
        // add your noops here
        useNavigate: jest.fn(() => 'bar')
    };
});

import * as ReactRouterDom from "react-router-dom";
...
// cannot redefine property
          Object.defineProperty(ReactRouterDom, 'useNavigate', {
              configurable: true,
              value: jest.fn(() => 'bar')
          });

// doesnt work
          jest.mock('react-router-dom', () => ({
              useNavigate: jest.fn(() => jest.fn),
          }))

// doesnt work
jest.spyOn(ReactRouterDom, 'useNavigate', 'get').mockReturnValue(jest.fn(() => jest.fn));

// doesnt work
jest.spyOn(ReactRouterDom, 'useNavigate').mockReturnValue(jest.fn(() => jest.fn));

// doesnt work
const mockedUsedNavigate = jest.fn();

jest.mock('react-router-dom', () => ({
   ...jest.requireActual('react-router-dom') as any,
  useNavigate: () => mockedUsedNavigate,
}));

all of these either show "Cannot redefine Property 'useNavigate'", or that useNavigate() may be used only in the context of a <Router> component.

Seriously, any other import mock works fine.

What am I doing wrong?

MY MINIMUM RECREATED PROJECT: https://github.com/zacharytyhacz/useNavigateBug

Upvotes: 47

Views: 70030

Answers (4)

Neil Girardi
Neil Girardi

Reputation: 4943

I'm using React testing Library. Per the documentation, I have a test utils file which exports a custom render method. The custom render method wraps the rendered component in mocked providers as well as a router. This enables me to do the following:

 it('redirects when span is clicked', async () => {
    const span = await screen.findByText('some text')
    await userEvent.click(span)
    await waitFor(() => expect(window.location.href).toContain('/some/sepcific/route'))
  })

To be fair, it's a different approach than what the OP asked specifically about. However, I think it's worth mentioning.

Upvotes: 4

Paweł Gościcki
Paweł Gościcki

Reputation: 9624

Here's how I mock and assert on navigate() calls in my component tests:

import * as router from 'react-router'

const navigate = jest.fn()

beforeEach(() => {
  jest.spyOn(router, 'useNavigate').mockImplementation(() => navigate)
})

it('...', () => {
  ...
  expect(navigate).toHaveBeenCalledWith('/path')
})

Upvotes: 37

sschilli
sschilli

Reputation: 2251

You should be able to spy on useNavigate normally if you change your import from:

import { useNavigate } from "react-router-dom"

to

import { useNavigate } from "react-router"

Upvotes: 16

exaucae
exaucae

Reputation: 2675

I had a similar concern that was fixed with this issue from react router

I would suggest you change the mock as is:

// pay attention to write it at the top level of your file
const mockedUsedNavigate = jest.fn();

jest.mock('react-router-dom', () => ({
   ...jest.requireActual('react-router-dom') as any,
  useNavigate: () => mockedUsedNavigate,
}));


// your describe/it/test blocks go down there

Upvotes: 102

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