Ensure tests have an active task runner

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 "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/ntp_logging_events.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class TestNTPUserDataLogger : public NTPUserDataLogger {
  public:
   TestNTPUserDataLogger() : NTPUserDataLogger(NULL) {}
   ~TestNTPUserDataLogger() override {}
 };
 
 base::HistogramBase::Count GetTotalCount(const std::string& histogram_name) {
   base::HistogramBase* histogram = base::StatisticsRecorder::FindHistogram(
       histogram_name);
   // Return 0 if history is uninitialized.
   return histogram ? histogram->SnapshotSamples()->TotalCount() : 0;
 }
 
 base::HistogramBase::Count GetBinCount(const std::string& histogram_name,
                                        base::HistogramBase::Sample value) {
   base::HistogramBase* histogram = base::StatisticsRecorder::FindHistogram(
       histogram_name);
   // Return 0 if history is uninitialized.
   return histogram ? histogram->SnapshotSamples()->GetCount(value) : 0;
 }
 
 }  // namespace
 
-TEST(NTPUserDataLoggerTest, TestLogging) {
+class NTPUserDataLoggerTest : public testing::Test {
+  content::TestBrowserThreadBundle thread_bundle_;
+};
+
+TEST_F(NTPUserDataLoggerTest, TestLogging) {
   base::StatisticsRecorder::Initialize();
 
   // Ensure empty statistics.
   EXPECT_EQ(0, GetTotalCount("NewTabPage.NumberOfMouseOvers"));
   EXPECT_EQ(0, GetBinCount("NewTabPage.NumberOfMouseOvers", 0));
 
   // Enusure non-zero statistics.
   TestNTPUserDataLogger logger;
 
   base::TimeDelta delta = base::TimeDelta::FromMilliseconds(0);
@@ skipping 44 matching lines @@
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfTiles"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfThumbnailTiles"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfThumbnailErrors"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfGrayTileFallbacks"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfExternalTileFallbacks"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfExternalTiles"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfGrayTiles"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.SuggestionsType"));
 }
 
-TEST(NTPUserDataLoggerTest, TestLogMostVisitedImpression) {
+TEST_F(NTPUserDataLoggerTest, TestLogMostVisitedImpression) {
   base::StatisticsRecorder::Initialize();
 
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 5));
 
   TestNTPUserDataLogger logger;
 
   logger.LogMostVisitedImpression(1, base::ASCIIToUTF16("foobar"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 5));
 
   logger.LogMostVisitedImpression(5, base::ASCIIToUTF16("foobar"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 5));
 
   // Try without provider. Only total increases.
   logger.LogMostVisitedImpression(5, base::ASCIIToUTF16(""));
   EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 5));
 
   logger.LogMostVisitedImpression(1, base::ASCIIToUTF16("foobar"));
   EXPECT_EQ(2, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsImpression.foobar", 5));
 }
 
-TEST(NTPUserDataLoggerTest, TestLogMostVisitedNavigation) {
+TEST_F(NTPUserDataLoggerTest, TestLogMostVisitedNavigation) {
   base::StatisticsRecorder::Initialize();
 
   EXPECT_EQ(0, GetTotalCount("NewTabPage.MostVisited"));
   EXPECT_EQ(0, GetBinCount("NewTabPage.MostVisited.foobar", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.MostVisited.foobar", 5));
 
   TestNTPUserDataLogger logger;
 
   logger.LogMostVisitedNavigation(1, base::ASCIIToUTF16("foobar"));
   EXPECT_EQ(1, GetTotalCount("NewTabPage.MostVisited"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.foobar", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.MostVisited.foobar", 5));
 
   logger.LogMostVisitedNavigation(5, base::ASCIIToUTF16("foobar"));
   EXPECT_EQ(2, GetTotalCount("NewTabPage.MostVisited"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.foobar", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.foobar", 5));
 
   // Try without provider. Only total increases.
   logger.LogMostVisitedNavigation(5, base::ASCIIToUTF16(""));
   EXPECT_EQ(3, GetTotalCount("NewTabPage.MostVisited"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.foobar", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.foobar", 5));
 
   logger.LogMostVisitedNavigation(1, base::ASCIIToUTF16("foobar"));
   EXPECT_EQ(4, GetTotalCount("NewTabPage.MostVisited"));
   EXPECT_EQ(2, GetBinCount("NewTabPage.MostVisited.foobar", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.foobar", 5));
 }