Tests do not run in CircleCi

[dvvanessastoiber]

• Release number or git hash: 8a34d5c
• Web browser version and OS: Chrome 78
• Environment (local or deployed): local

Steps to reproduce

1. Have a look at preceding CircleCi builds, e.g. this example
2. Open the Build tab

Observed behavior

• The build in CircleCI passes without any breaking errors
• This output is caused by a bootstrap error:

Chrome 79.0.3945 (Linux 0.0.0) ERROR
  Uncaught Error: Cannot find module "./style.scss"
  at tests.webpack.js:18153


10 01 2020 16:30:41.360:WARN [karma]: Test suite was empty.

• The tests have not been executed
• After migrating to jest with a different configuration, the tests failed locally.

Expected behavior

• Tests should run and might detect errors