add --junit flag to test runner

[yannbf]

Release notes

The test runner now supports JUnit XML test reports out of the box with a --junit flag:

yarn test-storybook --junit

With that flag, the test runner will add jest-junit to the reporters list and generate a test report in a JUnit XML format. You can further configure the behavior of jest-junit by either setting specific JEST_JUNIT_* environment variables or by defining a jest-junit field in your package.json with the options you want, which will be respected when generating the report. You can look at all available options here: https://github.com/jest-community/jest-junit#configuration

📦 Published PR as canary version: 0.6.4--canary.179.342c799.0

✨ Test out this PR locally via:

npm install @storybook/test-runner@0.6.4--canary.179.342c799.0
# or 
yarn add @storybook/test-runner@0.6.4--canary.179.342c799.0

[codecov-commenter]

Codecov Report

Merging #179 (c8f28d5) into next (d778968) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             next     #179      +/-   ##
==========================================
+ Coverage   76.40%   76.53%   +0.13%     
==========================================
  Files          11       11              
  Lines         178      179       +1     
  Branches       37       37              
==========================================
+ Hits          136      137       +1     
  Misses         42       42              

Impacted Files	Coverage Δ
src/util/getCliOptions.ts	55.55% <ø> (ø)
src/util/getParsedCliOptions.ts	5.88% <ø> (ø)
src/playwright/transformPlaywright.ts	100.00% <100.00%> (ø)

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[github-actions]

🚀 PR was released in v0.6.4 🚀