eth-gas-reporter

A Mocha reporter for Ethereum test suites:

• Gas usage per unit test.
• Metrics for method calls and deployments.
• National currency costs of deploying and using your contract system.
• CI integration with codechecks
• Simple installation for Truffle and Buidler

Example output

Installation and Config

Truffle

npm install --save-dev eth-gas-reporter

/* truffle-config.js */
module.exports = {
  networks: { ... },
  mocha: {
    reporter: 'eth-gas-reporter',
    reporterOptions : { ... } // See options below
  }
};

Buidler

npm install --save-dev buidler-gas-reporter

/* buidler.config.js */
usePlugin('buidler-gas-reporter');

module.exports = {
  networks: { ... },
  gasReporter: { ... } // See options below
};

Other

This reporter should work with any build platform that uses Mocha and connects to an Ethereum client running as a separate process. There's more on advanced use cases here.

Continuous Integration (Travis and CircleCI)

This reporter comes with a codechecks CI integration that displays a pull request's gas consumption changes relative to its target branch in the Github UI. It's like coveralls for gas. The codechecks service is free for open source and maintained by MakerDao engineer @krzkaczor.

Complete set-up guide here (it's easy).

Options

⚠️ CoinMarketCap API change ⚠️

Beginning March 2020, CoinMarketCap requires an API key to access currency market price data. The reporter uses an unprotected free tier key by default (10k reqs/mo). You can get your own API key here and set it with the coinmarketcap option.

Advanced Use

An advanced use guide is available here. Topics include:

• Getting accurate gas data when using proxy contracts like EtherRouter or ZeppelinOS.
• Configuring the reporter to work with non-truffle, non-buidler projects.

Example Reports

• gnosis/gnosis-contracts
• windingtree/LifToken

Usage Notes

• Requires Node >= 8.
• You cannot use ganache-core as an in-process provider for your test suite. The reporter makes sync RPC calls while collecting data and your tests will hang unless the client is launched as a separate process.
• Method calls that throw are filtered from the stats.
• Contracts that are only ever created by other contracts within Solidity are not shown in the deployments table.

Contributions

Feel free to open PRs or issues. There is an integration test and one of the mock test cases is expected to fail. If you're adding an option, you can vaildate it in CI by adding it to the mock options config located here.

Credits

All the ideas in this utility have been borrowed from elsewhere. Many thanks to:

• @maurelian - Mocha reporting gas instead of time is his idea.
• @cag - The table borrows from / is based his gas statistics work for the Gnosis contracts.
• Neufund - Block limit size ratios for contract deployments and euro pricing are borrowed from their ico-contracts test suite.

Contributors

• @cgewecke
• @rmuslimov
• @area
• @ldub
• @ben-kaufman
• @wighawag
• @ItsNickBarry
• @krzkaczor
• @ppoliani
• @gnidan
• @fodisi
• @vicnaum