message: make sure options are always defined
diff: @@ -70,7 +70,7 @@ export function emit(test, options = config, snapshot) {
  .concat(snapshot ? snapshot.teardownHooks.join('') : '')
  emittedTest += '});'
  - let func = `tests["${test.name}"] = async (driver, vars, opts) => {`
  + let func = `tests["${test.name}"] = async (driver, vars, opts = {}) => {`
  func += commands.join('')
  func += '}'
  