[Offline Pages] Create a event/activity logger

components/offline_pages/offline_page_model_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_page_model_event_logger.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace offline_pages {
+
+namespace {
+
+const char kNamespace[] = "last_n";
+const char kUrl[] = "http://www.wikipedia.org";
+const char kOfflineId[] = "foobar";
+const int kTimeLength = 21;
+const char kPageSaved[] =
+    "http://www.wikipedia.org is saved at last_n with id foobar";
+const char kPageDeleted[] = "Page with ID foobar has been deleted";
+const char kRecordStoreClearError[] = "Offline store clear failed";
+const char kRecordStoreCleared[] = "Offline store cleared";
+const char kRecordStoreReloadError[] =
+    "There was an error reloading the offline store";
+
+}  // namespace
+
+TEST(OfflinePageModelEventLoggerTest, RecordsWhenLoggingIsOn) {
+  OfflinePageModelEventLogger logger;
+  std::vector<std::string> log;
+
+  logger.SetIsLogging(true);
+  logger.RecordStoreCleared();
+  logger.RecordPageSaved(kNamespace, kUrl, kOfflineId);
+  logger.RecordPageDeleted(kOfflineId);
+  logger.RecordStoreClearError();
+  logger.RecordStoreReloadError();
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(5u, log.size());
+  EXPECT_EQ(std::string(kRecordStoreCleared), log[4].substr(kTimeLength));
+  EXPECT_EQ(std::string(kPageSaved), log[3].substr(kTimeLength));
+  EXPECT_EQ(std::string(kPageDeleted), log[2].substr(kTimeLength));
+  EXPECT_EQ(std::string(kRecordStoreClearError), log[1].substr(kTimeLength));
+  EXPECT_EQ(std::string(kRecordStoreReloadError), log[0].substr(kTimeLength));
+}
+
+TEST(OfflinePageModelEventLoggerTest, DoesNotRecordWhenLoggingIsOff) {
+  OfflinePageModelEventLogger logger;
+  std::vector<std::string> log;
+
+  logger.SetIsLogging(false);
+  logger.RecordStoreCleared();
+  logger.RecordPageSaved(kNamespace, kUrl, kOfflineId);
+  logger.RecordPageDeleted(kOfflineId);
+  logger.RecordStoreClearError();
+  logger.RecordStoreReloadError();
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(0u, log.size());
+}
+
+TEST(OfflinePageModelEventLoggerTest, DoesNotExceedMaxSize) {
+  OfflinePageModelEventLogger logger;
+  std::vector<std::string> log;
+
+  logger.SetIsLogging(true);
+  for (size_t i = 0; i < kMaxLogCount + 1; ++i) {
+    logger.RecordStoreCleared();
+  }
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(kMaxLogCount, log.size());
+}
+
+}  // namespace offline_internals