Added UndeltaStore.

This will be used to connect Reflector to kubelet update channel.

Added testing.

pkg/client/cache/undelta_store_test.go

@@ -0,0 +1,112 @@
+/*
+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 cache
+
+import (
+	"reflect"
+	"testing"
+)
+
+// store_test.go checks that UndeltaStore conforms to the Store interface
+// behavior.  This test just tests that it calls the push func in addition.
+
+type t struct{ int }
+
+var (
+	o1  interface{}   = t{1}
+	o2  interface{}   = t{2}
+	l1  []interface{} = []interface{}{t{1}}
+	l12 []interface{} = []interface{}{t{1}, t{2}}
+)
+
+func TestUpdateCallsPush(t *testing.T) {
+	var got []interface{}
+	var callcount int = 0
+	push := func(m []interface{}) {
+		callcount++
+		got = m
+	}
+
+	u := NewUndeltaStore(push)
+
+	u.Add("a", o2)
+	u.Update("a", o1)
+	if callcount != 2 {
+		t.Errorf("Expected 2 calls, got %d", callcount)
+	}
+	if !reflect.DeepEqual(l1, got) {
+		t.Errorf("Expected %#v, Got %#v", l1, got)
+	}
+}
+
+func TestDeleteCallsPush(t *testing.T) {
+	var got []interface{}
+	var callcount int = 0
+	push := func(m []interface{}) {
+		callcount++
+		got = m
+	}
+
+	u := NewUndeltaStore(push)
+
+	u.Add("a", o2)
+	u.Delete("a")
+	if callcount != 2 {
+		t.Errorf("Expected 2 calls, got %d", callcount)
+	}
+	expected := []interface{}{}
+	if !reflect.DeepEqual(expected, got) {
+		t.Errorf("Expected %#v, Got %#v", expected, got)
+	}
+}
+
+func TestReadsDoNotCallPush(t *testing.T) {
+	push := func(m []interface{}) {
+		t.Errorf("Unexpected call to push!")
+	}
+
+	u := NewUndeltaStore(push)
+
+	// These should not call push.
+	_ = u.List()
+	_ = u.ContainedIDs()
+	_, _ = u.Get("1")
+}
+
+func TestReplaceCallsPush(t *testing.T) {
+	var got []interface{}
+	var callcount int = 0
+	push := func(m []interface{}) {
+		callcount++
+		got = m
+	}
+
+	u := NewUndeltaStore(push)
+
+	m := make(map[string]interface{})
+	m["1"] = o1
+	m["2"] = o2
+
+	u.Replace(m)
+	if callcount != 1 {
+		t.Errorf("Expected 2 calls, got %d", callcount)
+	}
+	expected := l12
+	if !reflect.DeepEqual(expected, got) {
+		t.Errorf("Expected %#v, Got %#v", expected, got)
+	}
+}