Update idle timer test to use longer intervals.

This should increase reliability issues seen on
the bbots.

Review URL: http://codereview.chromium.org/9261

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@4471 0039d316-1c4b-4281-b951-d872f2087c98

base/idletimer_unittest.cc

@@ -10,6 +10,13 @@ using base::Time;
 using base::TimeDelta;
 using base::IdleTimer;
 
+
+// If the timers fire too quickly, it can be tricky to make timer tests
+// reliable on all buildbots.  This constant sets a minimum timer delta where
+// we expect that we should be able to reliably count timers without problems
+// due to slight clock/scheduling variances.
+const int kSafeTestIntervalMs = 500;
+
 namespace {
 
 // We Mock the GetLastInputInfo function to return
@@ -27,7 +34,7 @@ bool MockIdleTimeSource(int32 *milliseconds_interval_since_last_event) {
 class TestIdleTask : public IdleTimer {
  public:
   TestIdleTask(bool repeat)
-      : IdleTimer(TimeDelta::FromMilliseconds(100), repeat),
+      : IdleTimer(TimeDelta::FromMilliseconds(kSafeTestIntervalMs), repeat),
         idle_counter_(0) {
         set_idle_time_source(MockIdleTimeSource);
   }
@@ -72,7 +79,7 @@ class IdleTimerTest : public testing::Test {
 // then will not fire again unless it goes non-idle first.
 
 TEST_F(IdleTimerTest, NoRepeatIdle) {
-  // Create an IdleTimer, which should fire once after 100ms.
+  // Create an IdleTimer, which should fire once after 500ms.
   // Create a Quit timer which will fire after 1s.
   // Verify that we fired exactly once.
 
@@ -81,7 +88,8 @@ TEST_F(IdleTimerTest, NoRepeatIdle) {
 
   TestFinishedTask finish_task;
   base::OneShotTimer<TestFinishedTask> timer;
-  timer.Start(TimeDelta::FromSeconds(1), &finish_task, &TestFinishedTask::Run);
+  timer.Start(TimeDelta::FromMilliseconds(2 * kSafeTestIntervalMs),
+      &finish_task, &TestFinishedTask::Run);
 
   test_task.Start();
   MessageLoop::current()->Run();
@@ -90,9 +98,9 @@ TEST_F(IdleTimerTest, NoRepeatIdle) {
 }
 
 TEST_F(IdleTimerTest, NoRepeatFlipIdleOnce) {
-  // Create an IdleTimer, which should fire once after 100ms.
-  // Create a Quit timer which will fire after 1s.
-  // Create a timer to reset once, idle after 500ms.
+  // Create an IdleTimer, which should fire once after 500ms.
+  // Create a Quit timer which will fire after 5s.
+  // Create a timer to reset once, idle after 2s.
   // Verify that we fired exactly twice.
 
   mock_timer_started = Time::Now();
@@ -102,11 +110,11 @@ TEST_F(IdleTimerTest, NoRepeatFlipIdleOnce) {
   ResetIdleTask reset_task;
 
   base::OneShotTimer<TestFinishedTask> t1;
-  t1.Start(TimeDelta::FromMilliseconds(1000), &finish_task,
+  t1.Start(TimeDelta::FromMilliseconds(10 * kSafeTestIntervalMs), &finish_task,
            &TestFinishedTask::Run);
   
   base::OneShotTimer<ResetIdleTask> t2;
-  t2.Start(TimeDelta::FromMilliseconds(500), &reset_task,
+  t2.Start(TimeDelta::FromMilliseconds(4 * kSafeTestIntervalMs), &reset_task,
            &ResetIdleTask::Run);
 
   test_task.Start();
@@ -117,8 +125,8 @@ TEST_F(IdleTimerTest, NoRepeatFlipIdleOnce) {
 
 // TODO(darin): http://crbug.com/3704
 TEST_F(IdleTimerTest, DISABLED_NoRepeatNotIdle) {
-  // Create an IdleTimer, which should fire once after 100ms.
-  // Create a Quit timer which will fire after 1s.
+  // Create an IdleTimer, which should fire once after 500ms.
+  // Create a Quit timer which will fire after 5s.
   // Create a timer to reset idle every 50ms.
   // Verify that we never fired.
 
@@ -129,7 +137,7 @@ TEST_F(IdleTimerTest, DISABLED_NoRepeatNotIdle) {
   ResetIdleTask reset_task;
 
   base::OneShotTimer<TestFinishedTask> t;
-  t.Start(TimeDelta::FromMilliseconds(1000), &finish_task,
+  t.Start(TimeDelta::FromMilliseconds(10 * kSafeTestIntervalMs), &finish_task,
           &TestFinishedTask::Run);
   
   base::RepeatingTimer<ResetIdleTask> reset_timer;
@@ -152,34 +160,33 @@ TEST_F(IdleTimerTest, DISABLED_NoRepeatNotIdle) {
 // firing over and over.
 
 TEST_F(IdleTimerTest, Repeat) {
-  // Create an IdleTimer, which should fire repeatedly after 100ms.
-  // Create a Quit timer which will fire after 1.05s.
-  // Verify that we fired 10 times.
+  // Create an IdleTimer, which should fire repeatedly after 500ms.
+  // Create a Quit timer which will fire after 1.5s.
+  // Verify that we fired 2-3 times.
   mock_timer_started = Time::Now();
   TestIdleTask test_task(true);
 
   TestFinishedTask finish_task;
 
   base::OneShotTimer<TestFinishedTask> t;
-  t.Start(TimeDelta::FromMilliseconds(1050), &finish_task,
+  t.Start(TimeDelta::FromMilliseconds(kSafeTestIntervalMs * 3), &finish_task,
           &TestFinishedTask::Run);
 
   test_task.Start();
   MessageLoop::current()->Run();
 
-  // In a perfect world, the idle_counter should be 10.  However,
-  // since timers aren't guaranteed to fire perfectly, this can
-  // be less.  Just expect more than 5 and no more than 10.
-  EXPECT_GT(test_task.get_idle_counter(), 5);
-  EXPECT_LE(test_task.get_idle_counter(), 10);
+  // In a perfect world, the idle_counter should be 2.  However,
+  // due to timer 'slop', accept 2 or 3.
+  EXPECT_GE(test_task.get_idle_counter(), 2);
+  EXPECT_LE(test_task.get_idle_counter(), 3);
 }
 
 // TODO(darin):  http://crbug.com/3780
-TEST_F(IdleTimerTest, DISABLED_RepeatIdleReset) {
-  // Create an IdleTimer, which should fire repeatedly after 100ms.
-  // Create a Quit timer which will fire after 1s.
-  // Create a reset timer, which fires after 550ms
-  // Verify that we fired 9 times.
+TEST_F(IdleTimerTest, RepeatIdleReset) {
+  // Create an IdleTimer, which should fire repeatedly after 500ms.
+  // Create a Quit timer which will fire after 5s.
+  // Create a reset timer, which fires after 2500ms
+  // Verify that we fired 8-10 times.
   mock_timer_started = Time::Now();
   TestIdleTask test_task(true);
 
@@ -187,11 +194,11 @@ TEST_F(IdleTimerTest, DISABLED_RepeatIdleReset) {
   TestFinishedTask finish_task;
 
   base::OneShotTimer<TestFinishedTask> t1;
-  t1.Start(TimeDelta::FromMilliseconds(1000), &finish_task,
+  t1.Start(TimeDelta::FromMilliseconds(10 * kSafeTestIntervalMs), &finish_task,
            &TestFinishedTask::Run);
   
   base::OneShotTimer<ResetIdleTask> t2;
-  t2.Start(TimeDelta::FromMilliseconds(550), &reset_task,
+  t2.Start(TimeDelta::FromMilliseconds(5 * kSafeTestIntervalMs), &reset_task,
            &ResetIdleTask::Run);
 
   test_task.Start();
@@ -199,15 +206,15 @@ TEST_F(IdleTimerTest, DISABLED_RepeatIdleReset) {
 
   // In a perfect world, the idle_counter should be 9.  However,
   // since timers aren't guaranteed to fire perfectly, this can
-  // be less.  Just expect more than 5 and no more than 9.
-  EXPECT_GT(test_task.get_idle_counter(), 5);
-  EXPECT_LE(test_task.get_idle_counter(), 9);
+  // be less.  Accept 8-10.
+  EXPECT_GE(test_task.get_idle_counter(), 8);
+  EXPECT_LE(test_task.get_idle_counter(), 10);
 }
 
 // TODO(darin): http://crbug.com/3704
 TEST_F(IdleTimerTest, DISABLED_RepeatNotIdle) {
-  // Create an IdleTimer, which should fire repeatedly after 100ms.
-  // Create a Quit timer which will fire after 1s.
+  // Create an IdleTimer, which should fire repeatedly after 500ms.
+  // Create a Quit timer which will fire after 4s.
   // Create a timer to reset idle every 50ms.
   // Verify that we never fired.
 
@@ -218,7 +225,7 @@ TEST_F(IdleTimerTest, DISABLED_RepeatNotIdle) {
   ResetIdleTask reset_task;
 
   base::OneShotTimer<TestFinishedTask> t;
-  t.Start(TimeDelta::FromMilliseconds(1000), &finish_task,
+  t.Start(TimeDelta::FromMilliseconds(8 * kSafeTestIntervalMs), &finish_task,
           &TestFinishedTask::Run);
   
   base::RepeatingTimer<ResetIdleTask> reset_timer;