[Offline Pages] Create a event/activity logger

components/offline_pages/background/request_coordinator_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/background/request_coordinator_event_logger.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace offline_pages {
+
+namespace {
+
+const char kNamespace[] = "last_n";
+const char kStatus[] = "pending";
+const int64_t kId = 1234;
+const char kLogString[] =
+    "Save page request for ID: 1234 and namespace: "
+    "last_n has been updated with status pending";
+const int kTimeLength = 21;
+
+}  // namespace
+
+TEST(RequestCoordinatorEventLoggerTest, RecordsWhenLoggingIsOn) {
+  RequestCoordinatorEventLogger logger;
+  std::vector<std::string> log;
+
+  logger.SetIsLogging(true);
+  logger.RecordSavePageRequestUpdated(kNamespace, kStatus, kId);
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(1u, log.size());
+  EXPECT_EQ(std::string(kLogString), log[0].substr(kTimeLength));
+}
+
+TEST(RequestCoordinatorEventLoggerTest, RecordsWhenLoggingIsOff) {
+  RequestCoordinatorEventLogger logger;
+  std::vector<std::string> log;
+
+  logger.SetIsLogging(false);
+  logger.RecordSavePageRequestUpdated(kNamespace, kStatus, kId);
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(0u, log.size());
+}
+
+TEST(RequestCoordinatorEventLoggerTest, DoesNotExceedMaxSize) {
+  RequestCoordinatorEventLogger logger;
+  std::vector<std::string> log;
+
+  logger.SetIsLogging(true);
+  for (size_t i = 0; i < kMaxLogCount + 1; ++i) {
+    logger.RecordSavePageRequestUpdated(kNamespace, kStatus, kId);
+  }
+  logger.GetLogs(&log);
+
+  EXPECT_EQ(kMaxLogCount, log.size());
+}
+
+}  // namespace offline_pages