code: function validateFunction(path, driver, functionName) {
    if (typeof driver[functionName] !== 'function') {
      console.error(`${path} missing .${functionName}() implementation`);
      process.exit(1);
    }
  }
docs: Validate that the driver implementation has a function by name provided
  @param {string} path
  @param {object} driver
  @param {string} functionName