babel-jest is unable to find mock when path includes "/" on Windows

[erik-inkapool]

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

What is the current behavior?
Importing a module mock using import with babel-jest on Windows:

• Does not work when importing from "foo/bar"
• Does work when importing from "foo\bar"

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.
https://github.com/erik-lundgren/jest-windows-module-resolve-issue

What is the expected behavior?
Importing a module mock on windows:

• Should work when importing from "foo/bar"
• Should not work when importing from "foo\bar" (unless I'm mistaken)

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.
Jest config is practically nonexistent, see the repro repo.

Node: v8.4.0
npm: 5.3.0
Windows: 1607 (build 14393.1593)

[thymikee]

Isn't this already fixed in #4238?

[github-actions]

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