Add a NewDatastore helper function.

impl/memory/datastore_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 (
         "fmt"
         "testing"
         "time"
@@ skipping 587 matching lines @@
                 ds := dsS.Get(Use(context.Background()))
                 m := Model{ID: 1}
                 So(ds.Put(&m), ShouldBeNil)
 
                 // Reset to something non zero to ensure zero is fetched.
                 m.Time = time.Now().UTC()
                 So(ds.Get(&m), ShouldBeNil)
                 So(m.Time.IsZero(), ShouldBeTrue)
         })
 }
+
+func TestNewDatastore(t *testing.T) {
+        t.Parallel()
+
+        Convey("Can get and use a NewDatastore", t, func() {
+                ds, err := NewDatastore("aid", "ns")
+                So(err, ShouldBeNil)
+
+                k := ds.MakeKey("Something", 1)
+                So(k.AppID(), ShouldEqual, "aid")
+                So(k.Namespace(), ShouldEqual, "ns")
+
+                type Model struct {
+                        ID    int64 `gae:"$id"`
+                        Value []int64
+                }
+                So(ds.Put(&Model{ID: 1, Value: []int64{20, 30}}), ShouldBeNil)
+
+                vals := []dsS.PropertyMap{}
+                So(ds.GetAll(dsS.NewQuery("Model").Project("Value"), &vals), ShouldBeNil)
+                So(len(vals), ShouldEqual, 2)
+
+                So(vals[0]["Value"][0].Value(), ShouldEqual, 20)
+                So(vals[1]["Value"][0].Value(), ShouldEqual, 30)
+        })
+}