gin/time_clamper_unittest.cc

   1 // Copyright 2023 The Chromium Authors
   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 "gin/time_clamper.h"
   6
   7 #include "base/time/time.h"
   8 #include "build/build_config.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace gin {
  12
  13 TEST(TimeClamperTest, CurrentClockTimeMilliseconds) {
  14   TimeClamper clamper(1);
  15   EXPECT_EQ(0u, clamper.ClampToMillis(base::Time::UnixEpoch()));
  16
  17   // 1 us after unix epoch should round to 0.
  18   base::Time time = base::Time::UnixEpoch() + base::Microseconds(1);
  19   EXPECT_EQ(0u, clamper.ClampToMillis(time));
  20
  21   time = base::Time::UnixEpoch() + base::Milliseconds(1) -
  22          base::Microseconds(TimeClamper::kResolutionMicros - 1);
  23   EXPECT_EQ(0u, clamper.ClampToMillis(time));
  24
  25   time = base::Time::UnixEpoch() + base::Milliseconds(1);
  26   EXPECT_EQ(1u, clamper.ClampToMillis(time));
  27 }
  28
  29 #if !BUILDFLAG(IS_ANDROID)
  30 TEST(TimeClamperTest, CurrentClockTimeMillisecondsThreshold) {
  31   // This test assumes a time clamp of 5. If the clamp changes the time values
  32   // will need to be adjusted.
  33   ASSERT_EQ(5, TimeClamper::kResolutionMicros);
  34   TimeClamper clamper(1);
  35   base::Time time = base::Time::UnixEpoch() + base::Milliseconds(1) -
  36                     base::Microseconds(TimeClamper::kResolutionMicros);
  37   EXPECT_EQ(0u, clamper.ClampToMillis(time));
  38
  39   time = base::Time::UnixEpoch() + base::Milliseconds(1) -
  40          base::Microseconds(TimeClamper::kResolutionMicros) +
  41          base::Microseconds(1);
  42   EXPECT_EQ(0u, clamper.ClampToMillis(time));
  43
  44   time = base::Time::UnixEpoch() + base::Milliseconds(1) -
  45          base::Microseconds(TimeClamper::kResolutionMicros) +
  46          base::Microseconds(2);
  47   EXPECT_EQ(1u, clamper.ClampToMillis(time));
  48 }
  49
  50 TEST(TimeClamperTest, CurrentClockTimeMillisecondsThresholdNegative) {
  51   // This test assumes a time clamp of 5. If the clamp changes the time values
  52   // will need to be adjusted.
  53   // be adjusted.
  54   ASSERT_EQ(5, TimeClamper::kResolutionMicros);
  55   TimeClamper clamper(1);
  56   base::Time time = base::Time::UnixEpoch() + base::Milliseconds(-1) +
  57                     base::Microseconds(TimeClamper::kResolutionMicros);
  58   EXPECT_EQ(0u, clamper.ClampToMillis(time));
  59
  60   time = base::Time::UnixEpoch() + base::Milliseconds(-1) +
  61          base::Microseconds(TimeClamper::kResolutionMicros) -
  62          base::Microseconds(1);
  63   EXPECT_EQ(0u, clamper.ClampToMillis(time));
  64
  65   time = base::Time::UnixEpoch() + base::Milliseconds(-1) +
  66          base::Microseconds(TimeClamper::kResolutionMicros) -
  67          base::Microseconds(2);
  68   EXPECT_EQ(static_cast<int64_t>(-1), clamper.ClampToMillis(time));
  69 }
  70
  71 TEST(TimeClamperTest, CurrentClockTimeMillisecondsHighResolution) {
  72   TimeClamper clamper(1);
  73   EXPECT_EQ(0, clamper.ClampToMillisHighResolution(base::Time::UnixEpoch()));
  74
  75   base::Time time = base::Time::UnixEpoch() + base::Microseconds(1);
  76   EXPECT_EQ(0, clamper.ClampToMillisHighResolution(time));
  77
  78   time = base::Time::UnixEpoch() +
  79          base::Microseconds(TimeClamper::kResolutionMicros);
  80   EXPECT_EQ(0.005, clamper.ClampToMillisHighResolution(time));
  81
  82   time = base::Time::UnixEpoch() + base::Milliseconds(1) -
  83          base::Microseconds(TimeClamper::kResolutionMicros - 1);
  84   EXPECT_EQ(0.995, clamper.ClampToMillisHighResolution(time));
  85
  86   time = base::Time::UnixEpoch() + base::Milliseconds(1) -
  87          base::Microseconds(TimeClamper::kResolutionMicros - 3);
  88   EXPECT_EQ(1, clamper.ClampToMillisHighResolution(time));
  89
  90   time = base::Time::UnixEpoch() + base::Milliseconds(1);
  91   EXPECT_EQ(1, clamper.ClampToMillisHighResolution(time));
  92
  93   time =
  94       base::Time::UnixEpoch() + base::Milliseconds(1) + base::Microseconds(1);
  95   EXPECT_EQ(1.005, clamper.ClampToMillisHighResolution(time));
  96 }
  97 #endif
  98
  99 }  // namespace gin