Add a fake cloud impl.

Update the service registry with unit tests.

pkg/cloudprovider/fake_cloud.go

@@ -0,0 +1,64 @@
+/*
+Copyright 2014 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 cloudprovider
+
+import (
+	"net"
+)
+
+type FakeCloud struct {
+	Exists bool
+	Err    error
+	Calls  []string
+	IP     net.IP
+}
+
+func (f *FakeCloud) addCall(desc string) {
+	f.Calls = append(f.Calls, desc)
+}
+
+func (f *FakeCloud) ClearCalls() {
+	f.Calls = []string{}
+}
+
+func (f *FakeCloud) TCPLoadBalancer() (TCPLoadBalancer, error) {
+	return f, nil
+}
+
+func (f *FakeCloud) TCPLoadBalancerExists(name, region string) (bool, error) {
+	return f.Exists, f.Err
+}
+
+func (f *FakeCloud) CreateTCPLoadBalancer(name, region string, port int, hosts []string) error {
+	f.addCall("create")
+	return f.Err
+}
+
+func (f *FakeCloud) UpdateTCPLoadBalancer(name, region string, hosts []string) error {
+	f.addCall("update")
+	return f.Err
+}
+
+func (f *FakeCloud) DeleteTCPLoadBalancer(name, region string) error {
+	f.addCall("delete")
+	return f.Err
+}
+
+func (f *FakeCloud) IPAddress(instance string) (net.IP, error) {
+	f.addCall("ip-address")
+	return f.IP, f.Err
+}