Make setting a Memcache Item with a nil Value OK

impl/memory/memcache_test.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package memory
 
 import (
         "testing"
         "time"
 
@@ skipping 89 matching lines @@
                                 So(err, ShouldBeNil)
                                 So(getItm, ShouldResemble, testItem)
 
                                 Convey("Flush works too", func() {
                                         So(mc.Flush(), ShouldBeNil)
                                         _, err := mc.Get("sup")
                                         So(err, ShouldEqual, mcS.ErrCacheMiss)
                                 })
                         })
 
+                        Convey("Set (nil) is equivalent to Set([]byte{})", func() {
+                                So(mc.Set(mc.NewItem("bob")), ShouldBeNil)
+
+                                bob, err := mc.Get("bob")
+                                So(err, ShouldBeNil)
+                                So(bob.Value(), ShouldResemble, []byte{})
+                        })
+
                         Convey("Increment", func() {
                                 val, err := mc.Increment("num", 7, 2)
                                 So(err, ShouldBeNil)
                                 So(val, ShouldEqual, 9)
 
                                 Convey("IncrementExisting", func() {
                                         val, err := mc.IncrementExisting("num", -2)
                                         So(err, ShouldBeNil)
                                         So(val, ShouldEqual, 7)
 
@@ skipping 80 matching lines @@
                         testItem := &mcItem{
                                 key:   "sup",
                                 value: []byte("cool"),
                                 CasID: 1,
                         }
                         So(getItm, ShouldResemble, testItem)
                 })
 
         })
 }