Install the active_merchant_compat gem to your environment:
gem1.9.1 build activemerchantcompat.gemspec
gem1.9.1 install activemerchantcompat-0.1.gem
Create a file called gateways.yaml that will contain your test credentials:
authorize_net_cim_compat:
login: login
password: password
test: true
orbital_compat:
login: login
password: password
merchant_id: somemerchant
test: true
Run tox:
tox
Or run tests with setup.py:
python setup.py test
The tests will only run for gateways that you have supplied credentials for and the bogus gateway.