Disallow manually importing from __mocks__ (no-mocks-import)

When using jest.mock, your tests (just like the code being tested) should import from ./x, not ./__mocks__/x. Not following this rule can lead to confusion, because you will have multiple instances of the mocked module:

```js jest.mock('./x'); const x1 = require('./x'); const x2 = require('./mocks/x');

test('x', () => { expect(x1).toBe(x2); // fails! They are both instances of ./__mocks__/x, but not referentially equal }); ```

Rule details

This rule reports imports from a path containing a __mocks__ component.

Example violations:

js import thing from './__mocks__/index'; require('./__mocks__/index'); require('__mocks__');