smart-contract/mocha-smart-contracts-config.json

{
    "reporterEnabled": "mocha-junit-reporter, eth-gas-reporter",
    "mochaJunitReporterReporterOptions": {
	    "mochaFile": "./test-results/test-contract-results.xml"
    },
    "reporterOptions": {
      "currency": "USD",
      "gasPrice": 21
    }
}