Tests picked up in yarn cache directory

[jmorrell]

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

Bug

What is the current behavior?

When $HOME is the same as the application directory yarn will default to putting its cache directory at $APP_DIR/.cache/yarn/v1/... and Jest will pick up tests in dependencies.

This happens to users trying to use Jest with Heroku CI, where $HOME is /app.

What is the expected behavior?

Jest should ignore the yarn cache directory as a smart default like it currently does for node_modules.

[jmorrell]

I previously ran into this issue with CRA and tried to fix it there: facebook/create-react-app#2063 but it's probably better to update Jest's defaults.

If there's support for this I'm happy to open a PR.

[jmorrell]

Or perhaps it would be good to ignore all hidden directories that start with a . by default?

[thymikee]

@cpojer what do you think?

[jmorrell]

For anyone hitting this we'll be fixing this by updating the cache directory location. Follow along at: heroku/heroku-buildpack-nodejs#439

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