test for error eventEmmiter

push.js

'use strict'

var toId = require('./utils/to-id')

module.exports = push

/**
 * pushes one or multiple objects from local to remote database
 *
 * @param  {String,Object} docsOrIds   object, ID of object or array of objects/ids (all optional)
 * @return {Promise}
 */

function push (state, options, docsOrIds) {
  var pushedObjects = []
  var Promise = this.constructor.utils.Promise
  var errors = this.constructor.Errors
  var defer = {}

  defer.promise = new Promise(function (resolveCallback, rejectCallback) {
    defer.resolve = function resolve () {
      resolveCallback.apply(null, arguments)
    }
    defer.reject = function reject () {
      rejectCallback.apply(null, arguments)
    }
  })
  if (Array.isArray(docsOrIds)) {
    docsOrIds = docsOrIds.map(toId)
  } else {
    docsOrIds = docsOrIds && [toId(docsOrIds)]
  }

  if (docsOrIds && docsOrIds.filter(Boolean).length !== docsOrIds.length) {
    return Promise.reject(errors.NOT_AN_OBJECT)
  }

  var replication = this.replicate.to(options.remote, {
    create_target: true,
    doc_ids: docsOrIds,
    include_docs: true,
    retry: false
  })

  replication.on('complete', function () {
    defer.resolve(pushedObjects)
  })
  replication.on('error', defer.reject)
  replication.on('change', function (change) {
    pushedObjects = pushedObjects.concat(change.docs)

    for (var i = 0; i < change.docs.length; i++) {
      state.emitter.emit('push', change.docs[i])
    }
  })


  return defer.promise
}

test

test.only('api.push({}) error event', function (t) {
  t.plan(1)
  var db = dbFactory('hoodieDB8')
  var PouchDB = db.constructor
  var remoteName = PouchDB.utils.uuid(10)
  var api = db.hoodieSync({remote: remoteName})

  var obj1 = {_id: 'test1', foo1: 'bar1'}
  var obj2 = {_id: 'test2', foo1: 'bar2'}

  db.bulkDocs([obj1, obj2])
  db.destroy()
  .then(function () {
    return api.push()
  })
  .catch(function (error) {
    t.pass(error)
  })  
})

Just FYI... This is my solution:

test('api.push() error', function (t) {
  t.plan(1)
  var db = dbFactory('hoodieDB8')
  var PouchDB = db.constructor
  var remoteName = PouchDB.utils.uuid(10)
  var api = db.hoodieSync({remote: remoteName})

  var obj1 = {_id: 'test1', foo1: 'bar1'}

  var first = true
  var data = {
    get _id () {
      if (first) {
        first = false
        return 'test1'
      } else {
        return {}
      }
    },
    foo: 'bar'
  }

  db.bulkDocs([data, obj1])
  .then(function () {
    return api.push(data)
  })
  .then(
    function (resolve) {
      t.pass('The error event was not fired!')
    },
    function (reject) {
      t.pass('The error event was fired!')
    }
  )
})