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/**
* @file
* @brief Unit tests for openshot::Fraction
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @ref License
*/
// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include "openshot_catch.h"
#include <map>
#include <vector>
#include <sstream>
#include "Fraction.h"
using namespace openshot;
TEST_CASE( "Constructors", "[libopenshot][fraction]" )
{
// Create a default fraction (should be 1/1)
Fraction f1;
// Check default fraction
CHECK(f1.num == 1);
CHECK(f1.den == 1);
CHECK(f1.ToFloat() == Approx(1.0f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.0f).margin(0.00001));
// reduce fraction
f1.Reduce();
// Check the reduced fraction
CHECK(f1.num == 1);
CHECK(f1.den == 1);
CHECK(f1.ToFloat() == Approx(1.0f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.0f).margin(0.00001));
}
TEST_CASE( "Alt_Constructors", "[libopenshot][fraction]" )
{
// Use the delegating constructor for std::pair
std::pair<int, int> args{24, 1};
Fraction f1(args);
CHECK(f1.num == 24);
CHECK(f1.den == 1);
CHECK(f1.ToFloat() == Approx(24.0f).margin(0.00001));
// Use the delegating constructor for std::vector
std::vector<int> v{30000, 1001};
Fraction f2(v);
CHECK(f2.ToFloat() == Approx(30000.0/1001.0).margin(0.00001));
// Use the delegating constructor for std::map<std::string, int>
std::map<std::string, int> dict;
dict.insert({"num", 24000});
dict.insert({"den", 1001});
Fraction f3(dict);
CHECK(f3.den == 1001);
CHECK(f3.num == 24000);
CHECK(f3.Reciprocal().ToFloat() == Approx(1001.0/24000.0).margin(0.00001));
}
TEST_CASE( "WxH_640_480", "[libopenshot][fraction]" )
{
// Create fraction
Fraction f1(640, 480);
// Check fraction
CHECK(f1.num == 640);
CHECK(f1.den == 480);
CHECK(f1.ToFloat() == Approx(1.33333f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.33333f).margin(0.00001));
// reduce fraction
f1.Reduce();
// Check the reduced fraction
CHECK(f1.num == 4);
CHECK(f1.den == 3);
CHECK(f1.ToFloat() == Approx(1.33333f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.33333f).margin(0.00001));
}
TEST_CASE( "WxH_1280_720", "[libopenshot][fraction]" )
{
// Create fraction
Fraction f1(1280, 720);
// Check fraction
CHECK(f1.num == 1280);
CHECK(f1.den == 720);
CHECK(f1.ToFloat() == Approx(1.77777f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.77777f).margin(0.00001));
// reduce fraction
f1.Reduce();
// Check the reduced fraction
CHECK(f1.num == 16);
CHECK(f1.den == 9);
CHECK(f1.ToFloat() == Approx(1.77777f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.77777f).margin(0.00001));
}
TEST_CASE( "Reciprocal", "[libopenshot][fraction]" )
{
// Create fraction
Fraction f1(1280, 720);
// Check fraction
CHECK(f1.num == 1280);
CHECK(f1.den == 720);
CHECK(f1.ToFloat() == Approx(1.77777f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.77777f).margin(0.00001));
// Get the reciprocal of the fraction (i.e. flip the fraction)
Fraction f2 = f1.Reciprocal();
// Check the reduced fraction
CHECK(f2.num == 720);
CHECK(f2.den == 1280);
CHECK(f2.ToFloat() == Approx(0.5625f).margin(0.00001));
CHECK(f2.ToDouble() == Approx(0.5625f).margin(0.00001));
// Re-Check the original fraction (to be sure it hasn't changed)
CHECK(f1.num == 1280);
CHECK(f1.den == 720);
CHECK(f1.ToFloat() == Approx(1.77777f).margin(0.00001));
CHECK(f1.ToDouble() == Approx(1.77777f).margin(0.00001));
}
TEST_CASE( "Fraction operations", "[libopenshot][fraction]" ) {
openshot::Fraction f1(30, 1);
openshot::Fraction f2(3, 9);
// Multiply two Fractions
auto f3 = f1 * f2;
CHECK(f3.num == 90);
CHECK(f3.den == 9);
// Divide a Fraction by a Fraction
auto f4 = f1 / f2;
CHECK(f4.num == 270);
CHECK(f4.den == 3);
}
TEST_CASE( "Numeric multiplication", "[libopenshot][fraction]" )
{
openshot::Fraction f1(30000, 1001);
const int64_t num1 = 12;
const double num2 = 13.6;
const float num3 = 14.1;
const int num4 = 15;
// operator* with Fraction on LHS
CHECK(f1 * num1 == static_cast<int64_t>(f1.ToDouble() * num1));
CHECK_FALSE(f1 * num1 == f1.ToDouble() * num1);
CHECK_FALSE(f1 * num1 == f1.ToInt() * num1);
CHECK(f1 * num2 == Approx(static_cast<double>(f1.ToDouble() * num2))
.margin(0.0001));
CHECK(f1 * num3 == Approx(static_cast<float>(f1.ToDouble() * num3))
.margin(0.0001));
CHECK(f1 * num4 == static_cast<int>(f1.ToDouble() * num4));
CHECK_FALSE(f1 * num4 == f1.ToDouble() * num4);
CHECK_FALSE(f1 * num4 == f1.ToInt() * num4);
// operator* with Fraction on RHS
CHECK(num1 * f1 == static_cast<int64_t>(f1.ToDouble() * num1));
CHECK_FALSE(num1 * f1 == num1 * f1.ToDouble());
CHECK_FALSE(num1 * f1 == num1 * f1.ToInt());
CHECK(num2 * f1 == Approx(static_cast<double>(f1.ToDouble() * num2))
.margin(0.0001));
CHECK(num3 * f1 == Approx(static_cast<float>(f1.ToDouble() * num3))
.margin(0.0001));
CHECK(num4 * f1 == static_cast<int>(f1.ToDouble() * num4));
CHECK_FALSE(num4 * f1 == num4 * f1.ToDouble());
CHECK_FALSE(num4 * f1 == num4 * f1.ToInt());
// Transposition
CHECK(num1 * f1 == f1 * num1);
CHECK(num2 * f1 == Approx(f1 * num2).margin(0.0001));
CHECK(num3 * f1 == Approx(f1 * num3).margin(0.0001));
CHECK(num4 * f1 == f1 * num4);
}
TEST_CASE( "Numeric division", "[libopenshot][fraction]" )
{
openshot::Fraction f1(24000, 1001);
openshot::Fraction f2(1001, 30000);
const int64_t num1 = 2;
const double num2 = 3.5;
const float num3 = 4.99;
const int num4 = 5;
// operator* with Fraction on LHS
CHECK(f1 / num1 == static_cast<int64_t>(f1.ToDouble() / num1));
CHECK(f1 / num2 == Approx(static_cast<double>(f1.ToDouble() / num2))
.margin(0.0001));
CHECK(f1 / num3 == Approx(static_cast<float>(f1.ToDouble() / num3))
.margin(0.0001));
CHECK(f1 / num4 == static_cast<int>(f1.ToDouble() / num4));
CHECK(f2 / num1 == static_cast<int64_t>(f2.ToDouble() / num1));
CHECK(f2 / num2 == Approx(static_cast<double>(f2.ToDouble() / num2))
.margin(0.0001));
CHECK(f2 / num3 == Approx(static_cast<float>(f2.ToDouble() / num3))
.margin(0.0001));
CHECK(f2 / num4 == static_cast<int>(f2.ToDouble() / num4));
// operator* with Fraction on RHS
CHECK(num1 / f1 == static_cast<int64_t>(num1 / f1.ToDouble()));
CHECK(num2 / f1 == Approx(static_cast<double>(num2 / f1.ToDouble()))
.margin(0.0001));
CHECK(num3 / f1 == Approx(static_cast<float>(num3 / f1.ToDouble()))
.margin(0.0001));
CHECK(num4 / f1 == static_cast<int>(num4 / f1.ToDouble()));
CHECK(num1 / f2 == static_cast<int64_t>(num1 / f2.ToDouble()));
CHECK(num2 / f2 == Approx(static_cast<double>(num2 / f2.ToDouble()))
.margin(0.0001));
CHECK(num3 / f2 == Approx(static_cast<float>(num3 / f2.ToDouble()))
.margin(0.0001));
CHECK(num4 / f2 == static_cast<int>(num4 / f2.ToDouble()));
}
TEST_CASE( "Operator ostream", "[libopenshot][fraction]" )
{
std::stringstream output;
openshot::Fraction f3(30000, 1001);
output << f3;
CHECK(output.str() == "Fraction(30000, 1001)");
}
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