Simple memory testing for gae/wrapper

go/src/infra/gae/libs/meta/eg_test.go

Index: go/src/infra/gae/libs/meta/eg_test.go
diff --git a/go/src/infra/gae/libs/meta/eg_test.go b/go/src/infra/gae/libs/meta/eg_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..8abb102ca30648e39967385b1a9de4c50098db8f
--- /dev/null
+++ b/go/src/infra/gae/libs/meta/eg_test.go
@@ -0,0 +1,54 @@
+// 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 (
+	"testing"
+
+	"golang.org/x/net/context"
+
+	"infra/gae/libs/wrapper"
+	"infra/gae/libs/wrapper/memory"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestGetEntityGroupVersion(t *testing.T) {
+	t.Parallel()
+
+	Convey("GetEntityGroupVersion", t, func() {
+		c := memory.Use(memory.Enable(context.Background()))
+		ds := wrapper.GetDS(c)
+
+		type A struct {
+			ID  int64 `datastore:"-" goon:"id"`
+			Val int
+		}
+
+		a := &A{Val: 10}
+		aKey, err := ds.Put(a)
+		So(err, ShouldBeNil)
+
+		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)
+
+		tDs := ds.(wrapper.Testable)
+		tDs.BreakFeatures(nil, "Get")
+
+		v, err = GetEntityGroupVersion(c, aKey)
+		So(err.Error(), ShouldContainSubstring, "INTERNAL_ERROR")
+	})
+}