fix fake controller source watch behavior

pkg/controller/framework/fake_controller_source.go

@@ -158,6 +158,7 @@ func (f *FakeControllerSource) Watch(resourceVersion string) (watch.Interface, e
 	if err != nil {
 		return nil, err
 	}
+	rc++ // Don't re-send them a change they already have.
 	if rc < len(f.changes) {
 		changes := []watch.Event{}
 		for _, c := range f.changes[rc:] {

pkg/controller/framework/fake_controller_source_test.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package framework
+
+import (
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+)
+
+func TestRCNumber(t *testing.T) {
+	pod := func(name string) *api.Pod {
+		return &api.Pod{
+			ObjectMeta: api.ObjectMeta{
+				Name: name,
+			},
+		}
+	}
+
+	source := NewFakeControllerSource()
+	source.Add(pod("foo"))
+	source.Modify(pod("foo"))
+	source.Modify(pod("foo"))
+
+	w, err := source.Watch("1")
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	defer w.Stop()
+	got := <-w.ResultChan()
+	if e, a := "2", got.Object.(*api.Pod).ObjectMeta.ResourceVersion; e != a {
+		t.Errorf("wanted %v, got %v", e, a)
+	}
+}