Problems to run test

[henhuy]

First of all, thank you very much for your effort in implementing this dialect - this makes things very nice!

I had some Problems to run the tests, especially connection to the OEP was difficult/not very clear.
I just solved them and now it runs fine ;)
Nevertheless, I wanted to make some suggestions to make test script easier to understand:

• maybe you could set OED_STRING to:
  OED_STRING = 'postgresql+oedialect://{username}:{token}@{url}:{port}'
  to make clear which components are needed. The ÒED_CREDS are not set properly, so that I had to figure them out myself...
• you could give a "real" example with correct oep_url "oep.iks.cs.ovgu.de" and correct Port "80".

I think this would help, to easily establish an connection...
Regards, Hendrik