Setup a package.json script that runs all dependencies unit tests

**Is your feature request related to a problem? Please describe.**
There isn't a single point where all unit tests of all dependencies of the ebabel module can be run.

**Describe the solution you'd like**
Setup a package.json script that runs all dependencies unit tests.

**Additional context**
There should be no need to create new unit tests. Only the existing unit tests of all installed dependencies are run.