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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/base/histograms.h"
#include <limits>
#include "testing/gtest/include/gtest/gtest.h"
using base::TimeDelta;
using Sample = base::HistogramBase::Sample;
namespace cc {
class ScopedUMAHistogramAreaTimerBaseTest : public ::testing::Test {
protected:
void ExpectValidHistogramValues(base::TimeDelta elapsed,
int area,
Sample expected_time_microseconds,
Sample expected_pixels_per_ms) {
Sample time_microseconds;
Sample pixels_per_ms;
ScopedUMAHistogramAreaTimerBase::GetHistogramValues(
elapsed, area, &time_microseconds, &pixels_per_ms);
EXPECT_EQ(expected_time_microseconds, time_microseconds);
EXPECT_EQ(expected_pixels_per_ms, pixels_per_ms);
}
};
namespace {
TEST_F(ScopedUMAHistogramAreaTimerBaseTest, CommonCase) {
ExpectValidHistogramValues(TimeDelta::FromMicroseconds(500), 1000, 500, 2000);
ExpectValidHistogramValues(TimeDelta::FromMicroseconds(300), 1000, 300, 3333);
}
TEST_F(ScopedUMAHistogramAreaTimerBaseTest, ZeroArea) {
ExpectValidHistogramValues(TimeDelta::FromMicroseconds(500), 0, 500, 0);
}
TEST_F(ScopedUMAHistogramAreaTimerBaseTest, ZeroTime) {
// 1M pixels/ms, since the time is limited to at least 1us.
ExpectValidHistogramValues(TimeDelta(), 1000, 1, 1000000);
}
TEST_F(ScopedUMAHistogramAreaTimerBaseTest, ZeroTimeAndArea) {
ExpectValidHistogramValues(TimeDelta(), 0, 1, 0);
}
TEST_F(ScopedUMAHistogramAreaTimerBaseTest, VeryLargeTime) {
ExpectValidHistogramValues(TimeDelta::FromHours(24), 1000,
std::numeric_limits<Sample>::max(), 0);
}
TEST_F(ScopedUMAHistogramAreaTimerBaseTest, VeryLargeArea) {
ExpectValidHistogramValues(TimeDelta::FromMicroseconds(500), 1000000000, 500,
2000000000);
ExpectValidHistogramValues(TimeDelta::FromMicroseconds(1000),
std::numeric_limits<int>::max(), 1000,
std::numeric_limits<Sample>::max());
}
} // namespace
} // namespace cc
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