styled-jsx and jest could not run in Next@6

[blackbing]

Bug report

Describe the bug

This is a smallest reproduce example of styled-jsx-scss+jest problem. It is worked on next@5.1.0 In my project, but when upgrading to next@6, it will broke jest test. so I create an example to reproduce this problem.

Here is a repo:
https://github.com/blackbing/next-with-jest-style-jsx-error

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. clone this https://github.com/blackbing/next-with-jest-style-jsx-error
2. yarn test

Expected behavior

jest pass

System information

• OS: macOS
• node: 8.11.2(10 could reproduce too)
• Version of Next.js: 6.0.3

Additional context

$ NODE_ENV=test jest
 FAIL  __tests__/index.test.js
  With Enzyme
    ✕ App shows "Hello world!" (9ms)
  With Snapshot Testing
    ✕ App shows "Hello world!" (10ms)

  ● With Enzyme › App shows "Hello world!"

    ReferenceError: style is not defined

      2 |
      3 | export default () => (
  > 4 |   <div className='hello'>
      5 |     <p>Hello World</p>
      6 |     <style jsx global>{style}</style>
      7 |   </div>

      at Object._default [as type] (pages/index.js:4:3)
      at Object.<anonymous> (__tests__/index.test.js:11:17)

  ● With Snapshot Testing › App shows "Hello world!"

    ReferenceError: style is not defined



      at _default (pages/index.js:21:10)
      at Object.<anonymous> (__tests__/index.test.js:22:48)

[blackbing]

related to #4265

[JimLin94]

This is critical concern to me to jump into next6 as well!

[blackbing]

I can reproduce in Babel7.
checkout this branch
https://github.com/blackbing/styled-jsx/tree/upgrade-babel7

and the snapshot shows the same problem in this case.
https://github.com/blackbing/styled-jsx/blob/upgrade-babel7/test/snapshots/index.js.md#works-with-styled-jsx-styles-and-babel-preset-env

[timneutkens]

As the issue on styled-jsx was closed as fixed I'll close this issue.