Re-add metadata passthrough on Get operations

service/datastore/raw_interface_test.go

Index: service/datastore/raw_interface_test.go
diff --git a/service/datastore/raw_interface_test.go b/service/datastore/raw_interface_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..8bfac8a42693e8945cd26acf2d69d61e4f7638d1
--- /dev/null
+++ b/service/datastore/raw_interface_test.go
@@ -0,0 +1,51 @@
+// 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 (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestMultiMetaGetter(t *testing.T) {
+	t.Parallel()
+
+	Convey("Test MultiMetaGetter", t, func() {
+		Convey("nil", func() {
+			mmg := NewMultiMetaGetter(nil)
+			val, err := mmg.GetMeta(7, "hi")
+			So(err, ShouldEqual, ErrMetaFieldUnset)
+			So(val, ShouldBeNil)
+
+			So(mmg.GetMetaDefault(7, "hi", "value"), ShouldEqual, "value")
+
+			m := mmg.GetSingle(10)
+			val, err = m.GetMeta("hi")
+			So(err, ShouldEqual, ErrMetaFieldUnset)
+			So(val, ShouldBeNil)
+			So(m.GetMetaDefault("hi", "value"), ShouldEqual, "value")
+		})
+
+		Convey("stuff", func() {
+			pmaps := []PropertyMap{{}, nil, {}}
+			pmaps[0].SetMeta("hi", "thing")
+			pmaps[2].SetMeta("key", 100)
+			mmg := NewMultiMetaGetter(pmaps)
+
+			// oob is OK
+			So(mmg.GetMetaDefault(7, "hi", "value"), ShouldEqual, "value")
+
+			// nil is OK
+			So(mmg.GetMetaDefault(1, "key", true), ShouldEqual, true)
+
+			val, err := mmg.GetMeta(0, "hi")
+			So(err, ShouldBeNil)
+			So(val, ShouldEqual, "thing")
+
+			So(mmg.GetMetaDefault(2, "key", 20), ShouldEqual, 100)
+		})
+	})
+}