Make SampleRateCalculator test resilient to float precision issues.

test/cctest/test-profile-generator.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 //
 // Tests of profiles generator and utilities.
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 
 #include "v8.h"
 #include "profile-generator-inl.h"
 #include "cctest.h"
 #include "../include/v8-profiler.h"
@@ skipping 635 matching lines @@
   CHECK_EQ(kSamplingIntervalMs, calc2.ticks_per_ms());
   calc2.UpdateMeasurements(time);
   CHECK_EQ(kSamplingIntervalMs, calc2.ticks_per_ms());
   time += SampleRateCalculator::kWallTimeQueryIntervalMs * 0.5;
   calc2.UpdateMeasurements(time);
   // (1.0 + 2.0) / 2
   CHECK_EQ(kSamplingIntervalMs * 1.5, calc2.ticks_per_ms());
   time += SampleRateCalculator::kWallTimeQueryIntervalMs * 0.75;
   calc2.UpdateMeasurements(time);
   // (1.0 + 2.0 + 2.0) / 3
-  CHECK_EQ(kSamplingIntervalMs * 1.66666, calc2.ticks_per_ms());
+  CHECK_EQ(kSamplingIntervalMs * 5.0, round(calc2.ticks_per_ms() * 3.0));
 
   SampleRateCalculator calc3;
   time = 0.0;
   CHECK_EQ(kSamplingIntervalMs, calc3.ticks_per_ms());
   calc3.UpdateMeasurements(time);
   CHECK_EQ(kSamplingIntervalMs, calc3.ticks_per_ms());
   time += SampleRateCalculator::kWallTimeQueryIntervalMs * 2;
   calc3.UpdateMeasurements(time);
   // (1.0 + 0.5) / 2
   CHECK_EQ(kSamplingIntervalMs * 0.75, calc3.ticks_per_ms());
   time += SampleRateCalculator::kWallTimeQueryIntervalMs * 1.5;
   calc3.UpdateMeasurements(time);
   // (1.0 + 0.5 + 0.5) / 3
-  CHECK_EQ(kSamplingIntervalMs * 0.66666, calc3.ticks_per_ms());
+  CHECK_EQ(kSamplingIntervalMs * 2.0, round(calc3.ticks_per_ms() * 3.0));
 }
 
 
 // --- P r o f i l e r   E x t e n s i o n ---
 
 class ProfilerExtension : public v8::Extension {
  public:
   ProfilerExtension() : v8::Extension("v8/profiler", kSource) { }
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
       v8::Handle<v8::String> name);
@@ skipping 88 matching lines @@
   current = PickChild(current, "a");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "b");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "c");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   CHECK_EQ(0, current->children()->length());
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING