Most visited iframe now postMessage to signal the iframing page that the link has been displayed

chrome/browser/ui/webui/ntp/ntp_user_data_logger_unittest.cc

 // Copyright 2013 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 "chrome/browser/ui/webui/ntp/ntp_user_data_logger.h"
 
 #include "base/basictypes.h"
-#include "testing/gmock/include/gmock/gmock.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/statistics_recorder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
-class MockNTPUserDataLogger : public NTPUserDataLogger {
- public:
-  MockNTPUserDataLogger() : NTPUserDataLogger(NULL) {}
-  virtual ~MockNTPUserDataLogger() {}
+  base::HistogramBase::Count getTotalCount(const std::string& histogramName) {

[Mathieu, 2014/01/09 18:37:18]

no indent

[Alexei Svitkine (slow), 2014/01/09 18:54:41]

Capitalize function name. histogramName -> histogram_name.

Here and below.

[beaudoin, 2014/01/15 23:39:56]

Done.

[beaudoin, 2014/01/15 23:39:56]

Done.

+    base::HistogramBase* histogram = base::StatisticsRecorder::FindHistogram(
+      histogramName);

[Alexei Svitkine (slow), 2014/01/09 18:54:41]

This should be indented 4 more than previous line. Here and below.

[beaudoin, 2014/01/15 23:39:56]

Done.

+    return histogram->SnapshotSamples()->TotalCount();
+  }
 
-  MOCK_CONST_METHOD2(GetPercentError, size_t(size_t errors, size_t events));
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MockNTPUserDataLogger);
-};
+  base::HistogramBase::Count getBinCount(const std::string& histogramName,
+                                         base::HistogramBase::Sample value) {
+    base::HistogramBase* histogram = base::StatisticsRecorder::FindHistogram(
+      histogramName);
+    return histogram->SnapshotSamples()->GetCount(value);
+  }
 
 }  // namespace
 
-TEST(NTPUserDataLoggerTest, ThumbnailErrorRateDoesNotDivideByZero) {
-  MockNTPUserDataLogger logger;
-  EXPECT_CALL(logger, GetPercentError(testing::_, testing::_)).Times(0);
-  logger.EmitThumbnailErrorRate();
+TEST(NTPUserDataLoggerTest, TestLogging) {
+  base::StatisticsRecorder::Initialize();
+  NTPUserDataLogger logger(NULL);
+
+  // Ensure it works when the statistics are all empty. Only the mouseover
+  // should be logged in this case. The other histograms are not created yet so
+  // we can't query them.
+  logger.EmitNtpStatistics();
+
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfMouseOvers"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfMouseOvers", 0));
+
+  // Ensure it works with some non-zero statistics. All statistics should now
+  // be logged.
+  for (int i=0; i<20; ++i)
+    logger.LogEvent(NTP_MOUSEOVER);
+  for (int i=0; i<8; ++i)
+    logger.LogEvent(NTP_TILE);
+  for (int i=0; i<4; ++i)
+    logger.LogEvent(NTP_THUMBNAIL_ATTEMPT);
+  for (int i=0; i<2; ++i)
+    logger.LogEvent(NTP_THUMBNAIL_ERROR);
+  logger.LogEvent(NTP_GRAY_TILE_FALLBACK);
+  logger.LogEvent(NTP_EXTERNAL_FALLBACK);
+  for (int i=0; i<2; ++i)
+    logger.LogEvent(NTP_EXTERNAL_TILE);
+  for (int i=0; i<2; ++i)
+    logger.LogEvent(NTP_GRAY_TILE);
+  logger.LogEvent(NTP_SERVER_SIDE_SUGGESTION);
+  logger.EmitNtpStatistics();
+
+  EXPECT_EQ(2, getTotalCount("NewTabPage.NumberOfMouseOvers"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfMouseOvers", 0));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfMouseOvers", 20));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfTiles"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfTiles", 8));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfThumbnailAttempts"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfThumbnailAttempts", 4));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfThumbnailErrors"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfThumbnailErrors", 2));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfGrayTileFallbacks"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfGrayTileFallbacks", 1));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfExternalFallbacks"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfExternalFallbacks", 1));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfExternalTiles"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfExternalTiles", 2));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfGrayTiles"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfGrayTiles", 2));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.SuggestionsType"));
+  EXPECT_EQ(1, getBinCount("NewTabPage.SuggestionsType", 1));
+
+  // Statistics should be reset to 0, so we should not log anything else.
+  logger.EmitNtpStatistics();
+  EXPECT_EQ(3, getTotalCount("NewTabPage.NumberOfMouseOvers"));
+  EXPECT_EQ(2, getBinCount("NewTabPage.NumberOfMouseOvers", 0));
+  EXPECT_EQ(1, getBinCount("NewTabPage.NumberOfMouseOvers", 20));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfTiles"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfThumbnailAttempts"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfThumbnailErrors"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfGrayTileFallbacks"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfExternalFallbacks"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfExternalTiles"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.NumberOfGrayTiles"));
+  EXPECT_EQ(1, getTotalCount("NewTabPage.SuggestionsType"));
 }