How to increase verbosity in python unittest?

I figured out, that the Answer is in the eclipse configuration and not in the source code.

Open Preferences -> PyDev -> PyUnit and adjust the Parameters for test runner field. change --verbosity0 to --verbosity2 or whatever number you like. Unfortunately I don't know, how high you can set this.

As @Jace pointed out in the comments the verbosity-levels range from --verbosity0 to --verbosity9.