Encode nil datastore keys as PTNull.

service/datastore/properties_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 datastore
 
 import (
         "math"
         "testing"
         "time"
@@ skipping 49 matching lines @@
                                         So(pv.Value(), ShouldEqual, "sup")
                                         So(pv.IndexSetting(), ShouldEqual, ShouldIndex)
                                         So(pv.Type().String(), ShouldEqual, "PTString")
                                 })
                                 Convey("blobstore.Key is distinquished", func() {
                                         pv := MkProperty(blobstore.Key("sup"))
                                         So(pv.Value(), ShouldEqual, blobstore.Key("sup"))
                                         So(pv.IndexSetting(), ShouldEqual, ShouldIndex)
                                         So(pv.Type().String(), ShouldEqual, "PTBlobKey")
                                 })
+                                Convey("datastore Key is distinguished", func() {
+                                        k := MakeKey("appid", "ns", "kind", "1")
+                                        pv := MkProperty(k)
+                                        So(pv.Value(), ShouldHaveSameTypeAs, k)
+                                        So(pv.Value().(*Key).Equal(k), ShouldBeTrue)
+                                        So(pv.IndexSetting(), ShouldEqual, ShouldIndex)
+                                        So(pv.Type().String(), ShouldEqual, "PTKey")
+
+                                        pv = MkProperty((*Key)(nil))
+                                        So(pv.Value(), ShouldBeNil)
+                                        So(pv.IndexSetting(), ShouldEqual, ShouldIndex)
+                                        So(pv.Type().String(), ShouldEqual, "PTNull")
+                                })
                                 Convey("float", func() {
                                         pv := Property{}
                                         So(pv.SetValue(myfloat(19.7), ShouldIndex), ShouldBeNil)
                                         So(pv.Value(), ShouldHaveSameTypeAs, float64(19.7))
                                         So(pv.Value(), ShouldEqual, float32(19.7))
                                         So(pv.IndexSetting(), ShouldEqual, ShouldIndex)
                                         So(pv.Type().String(), ShouldEqual, "PTFloat")
                                 })
                         })
                         Convey("bad type", func() {
@@ skipping 118 matching lines @@
                         Convey("errors", func() {
 
                                 Convey("weird value", func() {
                                         pm := PropertyMap{}
                                         So(pm.SetMeta("sup", complex(100, 20)), ShouldBeFalse)
                                 })
                         })
                 })
         })
 }