Jest: Cannot `jest.mock('module/sub/directory/file')`

[namuol]

I'm requiring invariant in my tested code like so:

var invariant = require('react/lib/invariant');

In my tests, 'req/lib/invariant' does not get mocked, even when I explicitly call jest.mock('react/lib/invariant')

To get around this unexpected behavior, I require('./invariant'), which looks like this:

module.exports = require('react/lib/invariant');

Is there any way to require('sub/modules')?

[ivantsov]

I have the same problem. Is there any progress?

[aaronabramov]

is it still an issue?
i just ran

var invariant = require('fbjs/lib/invariant');

describe('invariant', function() {
  it('is mocked', function() {
    expect(invariant._isMockFunction).toBe(true);
  });
});

and it worked

[ivantsov]

I'm going to have a look at the thing today in the evening. Nevertheless, I think the problem has gone because jest was rewritten, particularly a mocking part.

[ivantsov]

Hi @dmitriiabramov, I've created a repo where you can reproduce the problem: https://github.com/ivantsov/jest-mock-nested-folders. Just run npm i & npm test.

There is a __mocks__ folder with sdk folder and foo.js file inside but Jest fails with error Cannot find module 'sdk/foo' from 'sample.js'.

Hope it helps.

[aaronabramov]

@ivantsov i think the issue here is that you don't have the sdk module.

here is what i tried in your repo:

mkdir -p node_modules/sdk && echo "module.exports = function() { return 1; }" >> node_modules/sdk/foo.js

and the test passed

[ivantsov]

But if I just create sdk.js inside __mocks__ it'll work as expected, without actually having sdk module. This is why I think it's unexpected behavior...

[aaronabramov]

that is true.. __mocks__/sdk.js worked, but __mocks__/sdk/foo.js didn't.
@cpojer any thoughts on that?

[vvo]

Yep, seems like any attempt to mock any require('module/submodule') mapped to mocks/module/submodule is failing on my side.

In the meantime I use jest.mock + require.requireActual

[cpojer]

Yeah the solution here is to use jest.mock. We are unlikely to extend manual mocks to have sub folders for now but I might revisit this decision in the future.