test-environment.config.js

const { GSNDevProvider } = require('@openzeppelin/gsn-provider');

module.exports = {
    accounts: {
        ether: 1e6,
    },

    contracts: {
        type: 'truffle',
    },

    setupProvider: (baseProvider) => {
        const { accounts } = require('@openzeppelin/test-environment');

        return new GSNDevProvider(baseProvider, {
            txfee: 70,
            useGSN: false,
            ownerAddress: accounts[8],
            relayerAddress: accounts[9],
        });
    },
};