1 files changed, 43 insertions, 0 deletions
diff --git a/components/drive/event_logger_unittest.cc b/components/drive/event_logger_unittest.cc
new file mode 100644
index 0000000..9d3b1fd
--- /dev/null
+++ b/components/drive/event_logger_unittest.cc
@@ -0,0 +1,43 @@
+// Copyright (c) 2012 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/drive/event_logger.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace drive {
+
+TEST(EventLoggerTest, BasicLogging) {
+  EventLogger logger;
+  logger.SetHistorySize(3);  // At most 3 events are kept.
+  EXPECT_EQ(0U, logger.GetHistory().size());
+
+  logger.Log(logging::LOG_INFO, "first");
+  logger.Log(logging::LOG_INFO, "%dnd", 2);
+  logger.Log(logging::LOG_INFO, "third");
+
+  // Events are recorded in the chronological order with sequential IDs.
+  std::vector<EventLogger::Event> history = logger.GetHistory();
+  ASSERT_EQ(3U, history.size());
+  EXPECT_EQ(0, history[0].id);
+  EXPECT_EQ("first", history[0].what);
+  EXPECT_EQ(1, history[1].id);
+  EXPECT_EQ("2nd", history[1].what);
+  EXPECT_EQ(2, history[2].id);
+  EXPECT_EQ("third", history[2].what);
+
+  logger.Log(logging::LOG_INFO, "fourth");
+  // It does not log events beyond the specified.
+  history = logger.GetHistory();
+  ASSERT_EQ(3U, history.size());
+  // The oldest events is pushed out.
+  EXPECT_EQ(1, history[0].id);
+  EXPECT_EQ("2nd", history[0].what);
+  EXPECT_EQ(2, history[1].id);
+  EXPECT_EQ("third", history[1].what);
+  EXPECT_EQ(3, history[2].id);
+  EXPECT_EQ("fourth", history[2].what);
+}
+
+}   // namespace drive