eth-gas-reporter

A mocha reporter for Truffle.

• Gas usage per unit test.
• Average gas usage per method.
• Contract deployment costs.
• Real currency costs.

Install

// Truffle installed globally
npm install -g eth-gas-reporter

// Truffle installed locally (ProTip: This always works.)
npm install --save-dev eth-gas-reporter

Truffle config

module.exports = {
  networks: {
    ...etc...
  },
  mocha: {
    reporter: 'eth-gas-reporter'
  }
};

Options

You can also create a .ethgas.js config in the root directory of your project to set gasPrice and currency options. Available currency codes can be found here.

module.exports = {
  currency: "CHF",    // Default: "EUR" (loaded at run-time from the `coinmarketcap` api)
  gasPrice: 21 * 1e9  // Default: (~5 gwei, loaded at run-time from the `blockcypher` api)
}

Examples

• gnosis/gnosis-contracts
• windingtree/LifToken

Usage Notes

• Table will not print if any tests fail (this is a bug, possibly rooted in truffle).
• Method calls that throw are filtered from the stats.
• Not currently shown in the deployments table:
  • Contracts that link to libraries
  • Contracts that never get instantiated within the tests (e.g: only deployed in migrations)
• Tests that make assumptions about the value of block.timestamp sometimes fail using this utility.
• Tests run slower.

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.