src/ppapi/shared_impl/time_conversion_unittest.cc

   1 // Copyright (c) 2012 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 <math.h>
   6 #include <stdlib.h>
   7
   8 #include "ppapi/shared_impl/time_conversion.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace ppapi {
  12
  13 // Slop we'll allow in two Time "internal values" to consider them equal.
  14 // Double conversion can introduce rounding errors. The internal values are in
  15 // microseconds, so an error here is very small.
  16 static const int kTimeInternalValueSlop = 2;
  17
  18 // Same as above in double-precision seconds units.
  19 static const double kTimeSecondsSlop =
  20     static_cast<double>(kTimeInternalValueSlop) /
  21     base::Time::kMicrosecondsPerSecond;
  22
  23 TEST(TimeConversion, Time) {
  24   // Should be able to round-trip.
  25   base::Time now = base::Time::Now();
  26   base::Time converted = ppapi::PPTimeToTime(TimeToPPTime(now));
  27   EXPECT_GE(kTimeInternalValueSlop,
  28             abs(static_cast<int>((converted - now).ToInternalValue())));
  29
  30   // Units should be in seconds.
  31   base::Time one_second_from_now = now + base::TimeDelta::FromSeconds(1);
  32   double converted_one_second_from_now =
  33       ppapi::TimeToPPTime(one_second_from_now) - ppapi::TimeToPPTime(now);
  34   EXPECT_GE(kTimeSecondsSlop, fabs(converted_one_second_from_now - 1));
  35 }
  36
  37 TEST(TimeConversion, EventTime) {
  38   // Should be able to round-trip.
  39   base::Time now = base::Time::Now();
  40   double event_now = now.ToDoubleT();
  41   double converted =
  42       ppapi::EventTimeToPPTimeTicks(ppapi::PPTimeTicksToEventTime(event_now));
  43   EXPECT_GE(kTimeSecondsSlop, fabs(converted - event_now));
  44
  45   // Units should be in seconds.
  46   base::Time one_second_from_now = now + base::TimeDelta::FromSeconds(1);
  47   double event_one_second_from_now = one_second_from_now.ToDoubleT();
  48   EXPECT_GE(kTimeSecondsSlop,
  49             1.0 - ppapi::EventTimeToPPTimeTicks(event_one_second_from_now) -
  50                 ppapi::EventTimeToPPTimeTicks(event_now));
  51 }
  52
  53 TEST(TimeConversion, EpochTime) {
  54   // Should be able to round-trip from epoch time.
  55   base::Time epoch = base::Time::UnixEpoch();
  56   base::Time converted = ppapi::PPTimeToTime(TimeToPPTime(epoch));
  57   EXPECT_GE(kTimeInternalValueSlop,
  58             abs(static_cast<int>((converted - epoch).ToInternalValue())));
  59
  60   // Units should be in seconds.
  61   base::Time one_second_from_epoch = epoch + base::TimeDelta::FromSeconds(1);
  62   double converted_one_second_from_epoch =
  63       ppapi::TimeToPPTime(one_second_from_epoch) - ppapi::TimeToPPTime(epoch);
  64   EXPECT_GE(kTimeSecondsSlop, fabs(converted_one_second_from_epoch - 1));
  65
  66   // Epoch time should be equal to a PP_Time of 0.0.
  67   EXPECT_GE(kTimeSecondsSlop, fabs(ppapi::TimeToPPTime(epoch) - 0.0));
  68   EXPECT_GE(kTimeInternalValueSlop,
  69             abs(static_cast<int>(
  70                 (ppapi::PPTimeToTime(0.0) - epoch).ToInternalValue())));
  71 }
  72
  73 }  // namespace ppapi