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/*
* This file is part of the Colobot: Gold Edition source code
* Copyright (C) 2001-2023, Daniel Roux, EPSITEC SA & TerranovaTeam
* http://epsitec.ch; http://colobot.info; http://github.com/colobot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://gnu.org/licenses
*/
#include "common/timeutils.h"
#include <gtest/gtest.h>
namespace TimeUtils
{
TEST(TimeUtilsExactDiffTest, ExactDiff)
{
auto epoch = TimeStamp{};
EXPECT_EQ(ExactDiff(epoch, epoch), 0);
auto duration = std::chrono::microseconds{123456789L};
auto before = std::chrono::high_resolution_clock::now();
auto after = before + duration;
EXPECT_EQ(ExactDiff(before, after), std::chrono::nanoseconds{duration}.count());
EXPECT_EQ(ExactDiff(after, before), -std::chrono::nanoseconds{duration}.count());
}
constexpr auto TIMESTAMP_START = TimeStamp{std::chrono::nanoseconds{300}};
constexpr auto TIMESTAMP_MID = TimeStamp{std::chrono::nanoseconds{600}};
constexpr auto TIMESTAMP_END = TimeStamp{std::chrono::nanoseconds{900}};
constexpr auto LERP_PARAM_ZERO = 0.0f;
constexpr auto LERP_PARAM_HALF = 0.5f;
constexpr auto LERP_PARAM_ONE = 1.0f;
TEST(TimeUtilsLerpTest, LerpReturnsStartWhenLerpParameterIsZero)
{
EXPECT_EQ(TIMESTAMP_START, Lerp(TIMESTAMP_START, TIMESTAMP_END, LERP_PARAM_ZERO));
}
TEST(TimeUtilsLerpTest, LerpReturnsEndWhenLerpParameterIsOne)
{
EXPECT_EQ(TIMESTAMP_END, Lerp(TIMESTAMP_START, TIMESTAMP_END, LERP_PARAM_ONE));
}
TEST(TimeUtilsLerpTest, LerpReturnsValueBetweenStartAndEndWhenLerpParameterIsBetweenZeroAndOne)
{
EXPECT_EQ(TIMESTAMP_MID, Lerp(TIMESTAMP_START, TIMESTAMP_END, LERP_PARAM_HALF));
}
TEST(TimeUtilsLerpTest, LerpIsMonotonic)
{
constexpr auto deltaLerpParam = 0.1f;
auto earlierTimeStamp = Lerp(TIMESTAMP_START, TIMESTAMP_END, LERP_PARAM_HALF - deltaLerpParam);
auto laterTimeStamp = Lerp(TIMESTAMP_START, TIMESTAMP_END, LERP_PARAM_HALF + deltaLerpParam);
EXPECT_TRUE(earlierTimeStamp < laterTimeStamp);
}
TEST(TimeUtilsLerpTest, LerpIsConsistent)
{
auto timeStamp = TIMESTAMP_START;
EXPECT_EQ(timeStamp, Lerp(timeStamp, timeStamp, LERP_PARAM_ZERO));
EXPECT_EQ(timeStamp, Lerp(timeStamp, timeStamp, LERP_PARAM_HALF));
EXPECT_EQ(timeStamp, Lerp(timeStamp, timeStamp, LERP_PARAM_ONE));
}
} // namespace TimeUtils
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