To see how it works, head into the test directory. You will need to launch Ganache-cli with these parameters

ganache-cli --defaultBalanceEther 10000 --network-id 1337 --chain-id 1337 --deterministic

You will also need a node version ^12. I use nvm to manage multiple node versions at the same time. This is akin to how pyenv is used to manage different versions of Python

Install yarn globally

npm install -g yarn

First install the deps

run in root

yarn

To run the tests you'll need both the ethereum-bridge (yarn add -g ethereum-bridge) and the GSN cli (yarn add -g @opengsn/gsn)

Run them in two different terminals: To start ethereum-bridge

ethereum-bridge -H localhost:8545 -a 9 --dev

To start GSN

gsn start

Once GSN starts, copy the Forwarder and Paymaster addresses printed by the terminals and put them in your .env file.

Now you are ready to run the tests

yarn test