storybook: [BUG][6.2.0-alpha] Snapshots tests failing

Describe the bug

I updated my Angular project to Storybook 6.2.0-alpha using npx sb@next upgrade --prerelease . When running npm run test to test the snapshots, the terminal outputs the following error message :

 FAIL  ./Storyshots.test.js
  ● Test suite failed to run

    Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    /Users/geromegrignon/Documents/workspace/open-source/seed-starter/node_modules/@storybook/addon-docs/dist/esm/frameworks/angular/index.js:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){export * from './compodoc';
                                                                                             ^^^^^^

    SyntaxError: Unexpected token 'export'

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1350:14)
      at Object.<anonymous> (node_modules/@storybook/addon-docs/angular/index.js:1:107)

To Reproduce Steps to reproduce the behavior:

1. Clone the following project : https://github.com/geromegrignon/seed-starter/tree/storybook-6.2.0
2. switch to storybook-6.2.0 branch
3. run npm run test

Expected behavior A clear and concise description of what you expected to happen.

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Code snippets If applicable, add code samples to help explain your problem.

System

Environment Info:

  System:
    OS: macOS 11.1
    CPU: (8) x64 Intel(R) Core(TM) i5-8279U CPU @ 2.40GHz
  Binaries:
    Node: 12.18.2 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.5 - /usr/local/bin/npm
  Browsers:
    Chrome: 87.0.4280.88
    Firefox: 81.0.1
    Safari: 14.0.2
  npmPackages:
    @storybook/addon-actions: ^6.2.0-alpha.8 => 6.2.0-alpha.8 
    @storybook/addon-docs: ^6.2.0-alpha.8 => 6.2.0-alpha.8 
    @storybook/addon-essentials: ^6.2.0-alpha.8 => 6.2.0-alpha.8 
    @storybook/addon-links: ^6.2.0-alpha.8 => 6.2.0-alpha.8 
    @storybook/addon-storyshots: ^6.2.0-alpha.8 => 6.2.0-alpha.8 
    @storybook/angular: ^6.2.0-alpha.8 => 6.2.0-alpha.8 

Additional context Add any other context about the problem here.