If you want to start fiddling around with the code, you need to install the relay and the dev requirements. Start by cloning the repository
git clone https://github.com/trustlines-protocol/relay.git
And install the relay and its development dependencies
pip install -r dev-requirements.txt -r requirements.txt -e .
You can run the tests on the relay with
You can also run end2end tests that will test how the contracts, relay, and clientlib work together. For more information about the end2end tests, see the end2end repository.