Add watch options

registry/mock/mock.go

@@ -87,8 +87,12 @@ func (m *mockRegistry) Deregister(s *registry.Service) error {
 	return nil
 }
 
-func (m *mockRegistry) Watch() (registry.Watcher, error) {
-	return &mockWatcher{exit: make(chan bool)}, nil
+func (m *mockRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
+	var wopts registry.WatchOptions
+	for _, o := range opts {
+		o(&wopts)
+	}
+	return &mockWatcher{exit: make(chan bool), opts: wopts}, nil
 }
 
 func (m *mockRegistry) String() string {

registry/mock/mock_watcher.go

@@ -8,6 +8,7 @@ import (
 
 type mockWatcher struct {
 	exit chan bool
+	opts registry.WatchOptions
 }
 
 func (m *mockWatcher) Next() (*registry.Result, error) {