Add meta package to datastore.

service/datastore/meta/eg_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 meta
+
+import (
+        "errors"
+        "testing"
+
+        "github.com/luci/gae/filter/featureBreaker"
+        "github.com/luci/gae/impl/memory"
+        "github.com/luci/gae/service/datastore"
+        . "github.com/smartystreets/goconvey/convey"
+        "golang.org/x/net/context"
+)
+
+func TestGetEntityGroupVersion(t *testing.T) {
+        t.Parallel()
+
+        Convey("GetEntityGroupVersion", t, func() {
+                c := memory.Use(context.Background())
+                c, fb := featureBreaker.FilterRDS(c, errors.New("INTERNAL_ERROR"))
+                ds := datastore.Get(c)
+
+                pm := datastore.PropertyMap{
+                        "$key": {datastore.MkPropertyNI(ds.MakeKey("A", ""))},
+                        "Val":  {datastore.MkProperty(10)},
+                }
+                So(ds.Put(pm), ShouldBeNil)
+                aKey := ds.KeyForObj(pm)
+                So(aKey, ShouldNotBeNil)
+
+                v, err := GetEntityGroupVersion(c, aKey)
+                So(err, ShouldBeNil)
+                So(v, ShouldEqual, 1)
+
+                So(ds.Delete(aKey), ShouldBeNil)
+
+                v, err = GetEntityGroupVersion(c, ds.NewKey("madeUp", "thing", 0, aKey))
+                So(err, ShouldBeNil)
+                So(v, ShouldEqual, 2)
+
+                v, err = GetEntityGroupVersion(c, ds.NewKey("madeUp", "thing", 0, nil))
+                So(err, ShouldBeNil)
+                So(v, ShouldEqual, 0)
+
+                fb.BreakFeatures(nil, "GetMulti")
+
+                v, err = GetEntityGroupVersion(c, aKey)
+                So(err.Error(), ShouldContainSubstring, "INTERNAL_ERROR")
+        })
+}