[Offline Pages] Expanding event logger to be used by harness.

components/offline_pages/offline_event_logger_unittest.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/offline_pages/offline_event_logger.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace offline_pages {
+
+namespace {
+const char kMessage[] = "Message is ";
+const int kTimeLength = 21;
+
+class EventLoggerTestClient : public OfflineEventLogger::Client {
+ public:
+  void CustomLog(const std::string& message) override {
+    last_log_message_ = message;
+  }
+
+  const std::string& last_log_message() { return last_log_message_; }
+
+ private:
+  std::string last_log_message_;
+};
+
+}  // namespace
+
+TEST(OfflineEventLoggerTest, SettingClientEnableLogging) {
+  OfflineEventLogger logger;
+  EventLoggerTestClient client;
+  logger.SetClient(&client);
+  EXPECT_TRUE(logger.GetIsLogging());
+}
+
+TEST(OfflineEventLoggerTest, SettingClientAndLog) {
+  OfflineEventLogger logger;
+  EventLoggerTestClient client;
+  logger.SetClient(&client);
+
+  logger.SetIsLogging(true);
+  for (size_t i = 0; i < kMaxLogCount + 1; ++i)
+    logger.RecordActivity(kMessage + std::to_string(i));
+  std::vector<std::string> log;
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(kMaxLogCount, log.size());
+  EXPECT_EQ(client.last_log_message(), log[0]);
+  EXPECT_EQ(std::string(kMessage) + std::to_string(kMaxLogCount),
+            client.last_log_message().substr(kTimeLength));
+}
+
+}  // namespace offline_pages