constructor({ id, title, pathPrefix }) {
    if (pathPrefix === undefined) {
      pathPrefix = `/${id}`
    }
    Object.assign(this, {
      id,
      title,
      pathPrefix,
      specs: [],
      _only: false,
    })
  }
Service Tester Constructor

@param {object} attrs Refer to individual attrs
@param {string} attrs.id
   Specifies which tests to run from the CLI or pull requests
@param {string} attrs.title
   Prints in the Mocha output
@param {string} attrs.pathPrefix
   Prefix which is automatically prepended to each tested URI.
   The default is `/${attrs.id}`.