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+// Copyright (C) 2014 Google Inc.
+//
+// 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.
+//
+// A mock implementation of the Source interface to be used in tests.
+
+#ifndef I18N_ADDRESSINPUT_TEST_MOCK_SOURCE_H_
+#define I18N_ADDRESSINPUT_TEST_MOCK_SOURCE_H_
+
+#include <libaddressinput/source.h>
+#include <libaddressinput/util/basictypes.h>
+
+#include <map>
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+// Gets address metadata from a key-value map. Sample usage:
+//    class MyClass {
+//     public:
+//      MyClass() : source_(),
+//                  data_ready_(BuildCallback(this, &MyClass::OnDataReady)) {
+//        source_.data_.insert(
+//            std::make_pair("data/XA", "{\"id\":\"data/XA\"}"));
+//      }
+//
+//      ~MyClass() {}
+//
+//      void GetData(const std::string& key) {
+//        source_.Get(key, *data_ready_);
+//      }
+//
+//     private:
+//      void OnDataReady(bool success,
+//                       const std::string& key,
+//                       std::string* data) {
+//        ...
+//        delete data;
+//      }
+//
+//      MockSource source_;
+//      const scoped_ptr<const Source::Callback> data_ready_;
+//
+//      DISALLOW_COPY_AND_ASSIGN(MyClass);
+//    };
+class MockSource : public Source {
+ public:
+  MockSource();
+  virtual ~MockSource();
+
+  // Source implementation.
+  virtual void Get(const std::string& key, const Callback& data_ready) const;
+
+  std::map<std::string, std::string> data_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockSource);
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_TEST_MOCK_SOURCE_H_