base/logging_unittest.cc

   1 // Copyright (c) 2011 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 "base/basictypes.h"
   6 #include "base/logging.h"
   7
   8 #include "testing/gmock/include/gmock/gmock.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace logging {
  12
  13 namespace {
  14
  15 using ::testing::Return;
  16
  17 // Needs to be global since log assert handlers can't maintain state.
  18 int log_sink_call_count = 0;
  19
  20 #if !defined(OFFICIAL_BUILD) || defined(DCHECK_ALWAYS_ON) || !defined(NDEBUG)
  21 void LogSink(const std::string& str) {
  22   ++log_sink_call_count;
  23 }
  24 #endif
  25
  26 // Class to make sure any manipulations we do to the min log level are
  27 // contained (i.e., do not affect other unit tests).
  28 class LogStateSaver {
  29  public:
  30   LogStateSaver() : old_min_log_level_(GetMinLogLevel()) {}
  31
  32   ~LogStateSaver() {
  33     SetMinLogLevel(old_min_log_level_);
  34     SetLogAssertHandler(NULL);
  35     SetLogReportHandler(NULL);
  36     log_sink_call_count = 0;
  37   }
  38
  39  private:
  40   int old_min_log_level_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(LogStateSaver);
  43 };
  44
  45 class LoggingTest : public testing::Test {
  46  private:
  47   LogStateSaver log_state_saver_;
  48 };
  49
  50 class MockLogSource {
  51  public:
  52   MOCK_METHOD0(Log, const char*());
  53 };
  54
  55 TEST_F(LoggingTest, BasicLogging) {
  56   MockLogSource mock_log_source;
  57   const int kExpectedDebugOrReleaseCalls = 6;
  58   const int kExpectedDebugCalls = 6;
  59   const int kExpectedCalls =
  60       kExpectedDebugOrReleaseCalls + (DEBUG_MODE ? kExpectedDebugCalls : 0);
  61   EXPECT_CALL(mock_log_source, Log()).Times(kExpectedCalls).
  62       WillRepeatedly(Return("log message"));
  63
  64   SetMinLogLevel(LOG_INFO);
  65
  66   EXPECT_TRUE(LOG_IS_ON(INFO));
  67   // As of g++-4.5, the first argument to EXPECT_EQ cannot be a
  68   // constant expression.
  69   const bool kIsDebugMode = (DEBUG_MODE != 0);
  70   EXPECT_TRUE(kIsDebugMode == DLOG_IS_ON(INFO));
  71   EXPECT_TRUE(VLOG_IS_ON(0));
  72
  73   LOG(INFO) << mock_log_source.Log();
  74   LOG_IF(INFO, true) << mock_log_source.Log();
  75   PLOG(INFO) << mock_log_source.Log();
  76   PLOG_IF(INFO, true) << mock_log_source.Log();
  77   VLOG(0) << mock_log_source.Log();
  78   VLOG_IF(0, true) << mock_log_source.Log();
  79
  80   DLOG(INFO) << mock_log_source.Log();
  81   DLOG_IF(INFO, true) << mock_log_source.Log();
  82   DPLOG(INFO) << mock_log_source.Log();
  83   DPLOG_IF(INFO, true) << mock_log_source.Log();
  84   DVLOG(0) << mock_log_source.Log();
  85   DVLOG_IF(0, true) << mock_log_source.Log();
  86 }
  87
  88 TEST_F(LoggingTest, LogIsOn) {
  89 #if defined(NDEBUG)
  90   const bool kDfatalIsFatal = false;
  91 #else  // defined(NDEBUG)
  92   const bool kDfatalIsFatal = true;
  93 #endif  // defined(NDEBUG)
  94
  95   SetMinLogLevel(LOG_INFO);
  96   EXPECT_TRUE(LOG_IS_ON(INFO));
  97   EXPECT_TRUE(LOG_IS_ON(WARNING));
  98   EXPECT_TRUE(LOG_IS_ON(ERROR));
  99   EXPECT_TRUE(LOG_IS_ON(ERROR_REPORT));
 100   EXPECT_TRUE(LOG_IS_ON(FATAL));
 101   EXPECT_TRUE(LOG_IS_ON(DFATAL));
 102
 103   SetMinLogLevel(LOG_WARNING);
 104   EXPECT_FALSE(LOG_IS_ON(INFO));
 105   EXPECT_TRUE(LOG_IS_ON(WARNING));
 106   EXPECT_TRUE(LOG_IS_ON(ERROR));
 107   EXPECT_TRUE(LOG_IS_ON(ERROR_REPORT));
 108   EXPECT_TRUE(LOG_IS_ON(FATAL));
 109   EXPECT_TRUE(LOG_IS_ON(DFATAL));
 110
 111   SetMinLogLevel(LOG_ERROR);
 112   EXPECT_FALSE(LOG_IS_ON(INFO));
 113   EXPECT_FALSE(LOG_IS_ON(WARNING));
 114   EXPECT_TRUE(LOG_IS_ON(ERROR));
 115   EXPECT_TRUE(LOG_IS_ON(ERROR_REPORT));
 116   EXPECT_TRUE(LOG_IS_ON(FATAL));
 117   EXPECT_TRUE(LOG_IS_ON(DFATAL));
 118
 119   SetMinLogLevel(LOG_ERROR_REPORT);
 120   EXPECT_FALSE(LOG_IS_ON(INFO));
 121   EXPECT_FALSE(LOG_IS_ON(WARNING));
 122   EXPECT_FALSE(LOG_IS_ON(ERROR));
 123   EXPECT_TRUE(LOG_IS_ON(ERROR_REPORT));
 124   EXPECT_TRUE(LOG_IS_ON(FATAL));
 125   EXPECT_TRUE(kDfatalIsFatal == LOG_IS_ON(DFATAL));
 126
 127   // LOG_IS_ON(ERROR_REPORT) should always be true.
 128   SetMinLogLevel(LOG_FATAL);
 129   EXPECT_FALSE(LOG_IS_ON(INFO));
 130   EXPECT_FALSE(LOG_IS_ON(WARNING));
 131   EXPECT_FALSE(LOG_IS_ON(ERROR));
 132   EXPECT_TRUE(LOG_IS_ON(ERROR_REPORT));
 133   EXPECT_TRUE(LOG_IS_ON(FATAL));
 134   EXPECT_TRUE(kDfatalIsFatal == LOG_IS_ON(DFATAL));
 135
 136   // So should LOG_IS_ON(FATAL).
 137   SetMinLogLevel(LOG_FATAL + 1);
 138   EXPECT_FALSE(LOG_IS_ON(INFO));
 139   EXPECT_FALSE(LOG_IS_ON(WARNING));
 140   EXPECT_FALSE(LOG_IS_ON(ERROR));
 141   EXPECT_TRUE(LOG_IS_ON(ERROR_REPORT));
 142   EXPECT_TRUE(LOG_IS_ON(FATAL));
 143   EXPECT_TRUE(kDfatalIsFatal == LOG_IS_ON(DFATAL));
 144 }
 145
 146 TEST_F(LoggingTest, LoggingIsLazy) {
 147   MockLogSource mock_log_source;
 148   EXPECT_CALL(mock_log_source, Log()).Times(0);
 149
 150   SetMinLogLevel(LOG_WARNING);
 151
 152   EXPECT_FALSE(LOG_IS_ON(INFO));
 153   EXPECT_FALSE(DLOG_IS_ON(INFO));
 154   EXPECT_FALSE(VLOG_IS_ON(1));
 155
 156   LOG(INFO) << mock_log_source.Log();
 157   LOG_IF(INFO, false) << mock_log_source.Log();
 158   PLOG(INFO) << mock_log_source.Log();
 159   PLOG_IF(INFO, false) << mock_log_source.Log();
 160   VLOG(1) << mock_log_source.Log();
 161   VLOG_IF(1, true) << mock_log_source.Log();
 162
 163   DLOG(INFO) << mock_log_source.Log();
 164   DLOG_IF(INFO, true) << mock_log_source.Log();
 165   DPLOG(INFO) << mock_log_source.Log();
 166   DPLOG_IF(INFO, true) << mock_log_source.Log();
 167   DVLOG(1) << mock_log_source.Log();
 168   DVLOG_IF(1, true) << mock_log_source.Log();
 169 }
 170
 171 // Official builds have CHECKs directly call BreakDebugger.
 172 #if !defined(OFFICIAL_BUILD)
 173
 174 TEST_F(LoggingTest, CheckStreamsAreLazy) {
 175   MockLogSource mock_log_source, uncalled_mock_log_source;
 176   EXPECT_CALL(mock_log_source, Log()).Times(8).
 177       WillRepeatedly(Return("check message"));
 178   EXPECT_CALL(uncalled_mock_log_source, Log()).Times(0);
 179
 180   SetLogAssertHandler(&LogSink);
 181
 182   CHECK(mock_log_source.Log()) << uncalled_mock_log_source.Log();
 183   PCHECK(!mock_log_source.Log()) << mock_log_source.Log();
 184   CHECK_EQ(mock_log_source.Log(), mock_log_source.Log())
 185       << uncalled_mock_log_source.Log();
 186   CHECK_NE(mock_log_source.Log(), mock_log_source.Log())
 187       << mock_log_source.Log();
 188 }
 189
 190 #endif
 191
 192 TEST_F(LoggingTest, DebugLoggingReleaseBehavior) {
 193 #if !defined(NDEBUG)
 194   int debug_only_variable = 1;
 195 #endif
 196   // These should avoid emitting references to |debug_only_variable|
 197   // in release mode.
 198   DLOG_IF(INFO, debug_only_variable) << "test";
 199   DLOG_ASSERT(debug_only_variable) << "test";
 200   DPLOG_IF(INFO, debug_only_variable) << "test";
 201   DVLOG_IF(1, debug_only_variable) << "test";
 202 }
 203
 204 TEST_F(LoggingTest, DcheckStreamsAreLazy) {
 205   MockLogSource mock_log_source;
 206   EXPECT_CALL(mock_log_source, Log()).Times(0);
 207 #if DCHECK_IS_ON
 208   DCHECK(true) << mock_log_source.Log();
 209   DCHECK_EQ(0, 0) << mock_log_source.Log();
 210 #else
 211   DCHECK(mock_log_source.Log()) << mock_log_source.Log();
 212   DPCHECK(mock_log_source.Log()) << mock_log_source.Log();
 213   DCHECK_EQ(0, 0) << mock_log_source.Log();
 214   DCHECK_EQ(mock_log_source.Log(), static_cast<const char*>(NULL))
 215       << mock_log_source.Log();
 216 #endif
 217 }
 218
 219 TEST_F(LoggingTest, Dcheck) {
 220 #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
 221   // Release build.
 222   EXPECT_FALSE(DCHECK_IS_ON);
 223   EXPECT_FALSE(DLOG_IS_ON(DCHECK));
 224 #elif defined(NDEBUG) && defined(DCHECK_ALWAYS_ON)
 225   // Release build with real DCHECKS.
 226   SetLogAssertHandler(&LogSink);
 227   EXPECT_TRUE(DCHECK_IS_ON);
 228   EXPECT_FALSE(DLOG_IS_ON(DCHECK));
 229 #else
 230   // Debug build.
 231   SetLogAssertHandler(&LogSink);
 232   EXPECT_TRUE(DCHECK_IS_ON);
 233   EXPECT_TRUE(DLOG_IS_ON(DCHECK));
 234 #endif
 235
 236   EXPECT_EQ(0, log_sink_call_count);
 237   DCHECK(false);
 238   EXPECT_EQ(DCHECK_IS_ON ? 1 : 0, log_sink_call_count);
 239   DPCHECK(false);
 240   EXPECT_EQ(DCHECK_IS_ON ? 2 : 0, log_sink_call_count);
 241   DCHECK_EQ(0, 1);
 242   EXPECT_EQ(DCHECK_IS_ON ? 3 : 0, log_sink_call_count);
 243 }
 244
 245 TEST_F(LoggingTest, DcheckReleaseBehavior) {
 246   int some_variable = 1;
 247   // These should still reference |some_variable| so we don't get
 248   // unused variable warnings.
 249   DCHECK(some_variable) << "test";
 250   DPCHECK(some_variable) << "test";
 251   DCHECK_EQ(some_variable, 1) << "test";
 252 }
 253
 254 }  // namespace
 255
 256 }  // namespace logging