truffle.js

require('babel-register');
require('babel-polyfill');

var HDWalletProvider = require('truffle-hdwallet-provider');
var mnemonic =
  process.env.SEED ||
  'rather rather rather rather rather rather rather rather rather rather rather rather';

module.exports = {
  solc: {
    optimizer: {
      enabled: true,
      runs: 200
    }
  },
  networks: {
    development: {
      host: 'localhost',
      port: 8545,
      network_id: '*'
    },
    coverage: {
      host: 'localhost',
      network_id: '*',
      port: 8555, // <-- Use port 8555
      gas: 0xfffffffffff, // <-- Use this high gas value
      gasPrice: 0x01 // <-- Use this low gas price
    },
    rinkeby: {
      provider: new HDWalletProvider(mnemonic, 'https://rinkeby.infura.io/'),
      network_id: '4'
    },
    mainnet: {
      provider: new HDWalletProvider(mnemonic, 'https://mainnet.infura.io/'),
      network_id: '1',
      gas: 4700000,
      gasPrice: 0x01
    }
  }
};