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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#include <catch2/catch_test_macros.hpp>
#include <catch2/catch_approx.hpp>
#include <cmath>
using Catch::Approx;
namespace {
static double divide(double a, double b) {
return a / b;
}
class StrongDoubleTypedef {
double d_ = 0.0;
public:
explicit StrongDoubleTypedef(double d) : d_(d) {}
explicit operator double() const { return d_; }
};
static std::ostream& operator<<(std::ostream& os, StrongDoubleTypedef td) {
return os << "StrongDoubleTypedef(" << static_cast<double>(td) << ")";
}
} // end unnamed namespace
using namespace Catch::literals;
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "A comparison that uses literals instead of the normal constructor", "[Approx]" ) {
double d = 1.23;
REQUIRE( d == 1.23_a );
REQUIRE( d != 1.22_a );
REQUIRE( -d == -1.23_a );
REQUIRE( d == 1.2_a .epsilon(.1) );
REQUIRE( d != 1.2_a .epsilon(.001) );
REQUIRE( d == 1_a .epsilon(.3) );
}
TEST_CASE( "Some simple comparisons between doubles", "[Approx]" ) {
double d = 1.23;
REQUIRE( d == Approx( 1.23 ) );
REQUIRE( d != Approx( 1.22 ) );
REQUIRE( d != Approx( 1.24 ) );
REQUIRE( d == 1.23_a );
REQUIRE( d != 1.22_a );
REQUIRE( Approx( d ) == 1.23 );
REQUIRE( Approx( d ) != 1.22 );
REQUIRE( Approx( d ) != 1.24 );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Approximate comparisons with different epsilons", "[Approx]" ) {
double d = 1.23;
REQUIRE( d != Approx( 1.231 ) );
REQUIRE( d == Approx( 1.231 ).epsilon( 0.1 ) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Less-than inequalities with different epsilons", "[Approx]" ) {
double d = 1.23;
REQUIRE( d <= Approx( 1.24 ) );
REQUIRE( d <= Approx( 1.23 ) );
REQUIRE_FALSE( d <= Approx( 1.22 ) );
REQUIRE( d <= Approx( 1.22 ).epsilon(0.1) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Greater-than inequalities with different epsilons", "[Approx]" ) {
double d = 1.23;
REQUIRE( d >= Approx( 1.22 ) );
REQUIRE( d >= Approx( 1.23 ) );
REQUIRE_FALSE( d >= Approx( 1.24 ) );
REQUIRE( d >= Approx( 1.24 ).epsilon(0.1) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Approximate comparisons with floats", "[Approx]" ) {
REQUIRE( 1.23f == Approx( 1.23f ) );
REQUIRE( 0.0f == Approx( 0.0f ) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Approximate comparisons with ints", "[Approx]" ) {
REQUIRE( 1 == Approx( 1 ) );
REQUIRE( 0 == Approx( 0 ) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Approximate comparisons with mixed numeric types", "[Approx]" ) {
const double dZero = 0;
const double dSmall = 0.00001;
const double dMedium = 1.234;
REQUIRE( 1.0f == Approx( 1 ) );
REQUIRE( 0 == Approx( dZero) );
REQUIRE( 0 == Approx( dSmall ).margin( 0.001 ) );
REQUIRE( 1.234f == Approx( dMedium ) );
REQUIRE( dMedium == Approx( 1.234f ) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Use a custom approx", "[Approx][custom]" ) {
double d = 1.23;
Approx approx = Approx::custom().epsilon( 0.01 );
REQUIRE( d == approx( 1.23 ) );
REQUIRE( d == approx( 1.22 ) );
REQUIRE( d == approx( 1.24 ) );
REQUIRE( d != approx( 1.25 ) );
REQUIRE( approx( d ) == 1.23 );
REQUIRE( approx( d ) == 1.22 );
REQUIRE( approx( d ) == 1.24 );
REQUIRE( approx( d ) != 1.25 );
}
TEST_CASE( "Approximate PI", "[Approx][PI]" ) {
REQUIRE( divide( 22, 7 ) == Approx( 3.141 ).epsilon( 0.001 ) );
REQUIRE( divide( 22, 7 ) != Approx( 3.141 ).epsilon( 0.0001 ) );
}
///////////////////////////////////////////////////////////////////////////////
TEST_CASE( "Absolute margin", "[Approx]" ) {
REQUIRE( 104.0 != Approx(100.0) );
REQUIRE( 104.0 == Approx(100.0).margin(5) );
REQUIRE( 104.0 == Approx(100.0).margin(4) );
REQUIRE( 104.0 != Approx(100.0).margin(3) );
REQUIRE( 100.3 != Approx(100.0) );
REQUIRE( 100.3 == Approx(100.0).margin(0.5) );
}
TEST_CASE("Approx with exactly-representable margin", "[Approx]") {
CHECK( 0.25f == Approx(0.0f).margin(0.25f) );
CHECK( 0.0f == Approx(0.25f).margin(0.25f) );
CHECK( 0.5f == Approx(0.25f).margin(0.25f) );
CHECK( 245.0f == Approx(245.25f).margin(0.25f) );
CHECK( 245.5f == Approx(245.25f).margin(0.25f) );
}
TEST_CASE("Approx setters validate their arguments", "[Approx]") {
REQUIRE_NOTHROW(Approx(0).margin(0));
REQUIRE_NOTHROW(Approx(0).margin(1234656));
REQUIRE_THROWS_AS(Approx(0).margin(-2), std::domain_error);
REQUIRE_NOTHROW(Approx(0).epsilon(0));
REQUIRE_NOTHROW(Approx(0).epsilon(1));
REQUIRE_THROWS_AS(Approx(0).epsilon(-0.001), std::domain_error);
REQUIRE_THROWS_AS(Approx(0).epsilon(1.0001), std::domain_error);
}
TEST_CASE("Default scale is invisible to comparison", "[Approx]") {
REQUIRE(101.000001 != Approx(100).epsilon(0.01));
REQUIRE(std::pow(10, -5) != Approx(std::pow(10, -7)));
}
TEST_CASE("Epsilon only applies to Approx's value", "[Approx]") {
REQUIRE(101.01 != Approx(100).epsilon(0.01));
}
TEST_CASE("Assorted miscellaneous tests", "[Approx][approvals]") {
REQUIRE(INFINITY == Approx(INFINITY));
REQUIRE(-INFINITY != Approx(INFINITY));
REQUIRE(1 != Approx(INFINITY));
REQUIRE(INFINITY != Approx(1));
REQUIRE(NAN != Approx(NAN));
REQUIRE_FALSE(NAN == Approx(NAN));
}
TEST_CASE( "Comparison with explicitly convertible types", "[Approx]" )
{
StrongDoubleTypedef td(10.0);
REQUIRE(td == Approx(10.0));
REQUIRE(Approx(10.0) == td);
REQUIRE(td != Approx(11.0));
REQUIRE(Approx(11.0) != td);
REQUIRE(td <= Approx(10.0));
REQUIRE(td <= Approx(11.0));
REQUIRE(Approx(10.0) <= td);
REQUIRE(Approx(9.0) <= td);
REQUIRE(td >= Approx(9.0));
REQUIRE(td >= Approx(td));
REQUIRE(Approx(td) >= td);
REQUIRE(Approx(11.0) >= td);
}
TEST_CASE("Approx::operator() is const correct", "[Approx][.approvals]") {
const Approx ap = Approx(0.0).margin(0.01);
// As long as this compiles, the test should be considered passing
REQUIRE(1.0 == ap(1.0));
}
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