Nested manual mock fails with folders on Windows

[tw0517tw]

Do you want to request a feature or report a bug?

BUG
related to #2483 ?

What is the current behavior?

When creating nested mocks with module/folder/file it will fail on Windows due to separation character.
For example, creating file

/__mocks__/lodash/fp/add.js
                 ^^^^folder

to mock lodash/fp/add will fail on Windows.

But using file

/__mocks__/lodash/sum.js
               ^^^^^no folder

to mock lodash/sum would just work fine.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

Check my reproducing repo and its CI status.

What is the expected behavior?

It should mock lodash/fp/add with /__mocks__/lodash/fp/add.js on Windows.
I've tried to modify this line in get_mock_name.js, adding .replace(/\\/g, '/') at the end and this was working. But I'm not sure if this is the best solution.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

In the repo above with 2 CIs.

[thymikee]

Fixed in #4238

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