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+// Copyright (C) 2013 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 fake downloader object to use in tests. Reads data from a file instead of
+// downloading it from a server.
+
+#ifndef I18N_ADDRESSINPUT_TEST_FAKE_DOWNLOADER_H_
+#define I18N_ADDRESSINPUT_TEST_FAKE_DOWNLOADER_H_
+
+#include <libaddressinput/downloader.h>
+
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+// "Downloads" serialized validation rules from a test data file. Sample usage:
+//    class MyClass {
+//     public:
+//      MyClass() : downloader_(),
+//                  callback_(BuildCallback(this, &MyClass::OnDownloaded)) {}
+//
+//      ~MyClass() {}
+//
+//      void GetData(const std::string& key) {
+//        downloader_.Download(std::string(FakeDownloader::kFakeDataUrl) + key,
+//                             *callback_);
+//      }
+//
+//     private:
+//      void OnDownloaded(bool success,
+//                        const std::string& url,
+//                        std::string* data) {
+//        ...
+//        delete data;
+//      }
+//
+//      FakeDownloader downloader_;
+//      scoped_ptr<Downloader::Callback> callback_;
+//
+//      DISALLOW_COPY_AND_ASSIGN(MyClass);
+//    };
+class FakeDownloader : public Downloader {
+ public:
+  // The fake data URL to be used in tests for retrieving one key at a time.
+  static const char kFakeDataUrl[];
+
+  // The fake data URL to be used in tests for retrieving aggregate data, which
+  // is a JSON dictionary that maps from keys to dictionaries of what you would
+  // normally get from kFakeDataUrl.
+  static const char kFakeAggregateDataUrl[];
+
+  FakeDownloader();
+  virtual ~FakeDownloader();
+
+  // Downloader implementation.
+  virtual void Download(const std::string& url,
+                        const Callback& downloaded) const;
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_TEST_FAKE_DOWNLOADER_H_