components/drive/event_logger_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/drive/event_logger.h"
   6
   7 #include "testing/gtest/include/gtest/gtest.h"
   8
   9 namespace drive {
  10
  11 TEST(EventLoggerTest, BasicLogging) {
  12   EventLogger logger;
  13   logger.SetHistorySize(3);  // At most 3 events are kept.
  14   EXPECT_EQ(0U, logger.GetHistory().size());
  15
  16   logger.Log(logging::LOG_INFO, "first");
  17   logger.Log(logging::LOG_INFO, "%dnd", 2);
  18   logger.Log(logging::LOG_INFO, "third");
  19
  20   // Events are recorded in the chronological order with sequential IDs.
  21   std::vector<EventLogger::Event> history = logger.GetHistory();
  22   ASSERT_EQ(3U, history.size());
  23   EXPECT_EQ(0, history[0].id);
  24   EXPECT_EQ("first", history[0].what);
  25   EXPECT_EQ(1, history[1].id);
  26   EXPECT_EQ("2nd", history[1].what);
  27   EXPECT_EQ(2, history[2].id);
  28   EXPECT_EQ("third", history[2].what);
  29
  30   logger.Log(logging::LOG_INFO, "fourth");
  31   // It does not log events beyond the specified.
  32   history = logger.GetHistory();
  33   ASSERT_EQ(3U, history.size());
  34   // The oldest events is pushed out.
  35   EXPECT_EQ(1, history[0].id);
  36   EXPECT_EQ("2nd", history[0].what);
  37   EXPECT_EQ(2, history[1].id);
  38   EXPECT_EQ("third", history[1].what);
  39   EXPECT_EQ(3, history[2].id);
  40   EXPECT_EQ("fourth", history[2].what);
  41 }
  42
  43 }   // namespace drive