acuminous/zUnit

const EventEmitter = require('events');

class Runnable extends EventEmitter {
  constructor(name) {
    super();
    this._name = name;
  }

  get name() {
    return this._name;
  }

  get description() {
    return this._parent ? `${this._parent.description} / ${this.name}` : this.name;
  }

  _makeDone() {
    let alreadyCalled = false;
    let callback;
    const promise =
      this._fn.length > 1
        ? new Promise((resolve, reject) => {
            callback = (err) => {
              if (alreadyCalled) throw new Error('done already called');
              alreadyCalled = true;
              return err ? reject(err) : resolve();
            };
          })
        : Promise.resolve();
    return { callback, promise };
  }
}

module.exports = Runnable;