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

[ebabel-eu]

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.