     it "should filter data through database", (done)->
       count = 0
       data = {}
-      stream = ReadStream
-        db:db
+      stream = ReadStream db,
         keyAsBuffer: false
         ValueAsBuffer: false
         filter: (k,v)->

      stream.on "error", (err)->
        done(err)
      stream.on "end", ()->
        keys = (k for k of data)
        count--
        assert.equal keys.length, count
        for k,v of data

describe "ReadStream", ->
  db = initTestDB()
  describe ".create", ->
    it "should create a ReadStream via db argument", ->
      stream = ReadStream(db)
      should.exist stream, "stream"
      stream.should.be.instanceOf ReadStream
      should.exist stream._iterator, "iterator should be exists"
    it "should create a ReadStream via options.db", ->
      stream = ReadStream(null, {db:db})
      should.exist stream
      stream.should.be.instanceOf ReadStream
      should.exist stream._iterator, "iterator should be exists"
  describe ".read", ->
    it "should read all data through database", (done)->
      data = {}
      stream = ReadStream(db, {keyAsBuffer: false, ValueAsBuffer: false})
      stream.on "data", (item)->
        data[item.key] = item.value
      stream.on "error", (err)->
