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catch2/tests/SelfTest/UsageTests/Matchers.tests.cpp

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/*
* Distributed under the Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*/
#include <catch2/catch_test_macros.hpp>
#include <catch2/matchers/catch_matchers_exception.hpp>
#include <catch2/matchers/catch_matchers_floating_point.hpp>
#include <catch2/matchers/catch_matchers_predicate.hpp>
#include <catch2/matchers/catch_matchers_string.hpp>
#include <catch2/matchers/catch_matchers_vector.hpp>
#include <catch2/matchers/catch_matchers_templated.hpp>
#include <algorithm>
#include <exception>
#include <cmath>
#include <list>
#include <sstream>
#ifdef __clang__
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wweak-vtables"
# pragma clang diagnostic ignored "-Wpadded"
#endif
namespace {
static const char* testStringForMatching() {
return "this string contains 'abc' as a substring";
}
static const char* testStringForMatching2() {
return "some completely different text that contains one common word";
}
static bool alwaysTrue( int ) { return true; }
static bool alwaysFalse( int ) { return false; }
#ifdef _MSC_VER
# pragma warning( disable : 4702 ) // Unreachable code -- MSVC 19 (VS 2015)
// sees right through the indirection
#endif
struct SpecialException : std::exception {
SpecialException( int i_ ): i( i_ ) {}
char const* what() const noexcept override {
return "SpecialException::what";
}
int i;
};
struct DerivedException : std::exception {
char const* what() const noexcept override {
return "DerivedException::what";
}
};
static void doesNotThrow() {}
[[noreturn]] static void throwsSpecialException( int i ) {
throw SpecialException{ i };
}
[[noreturn]] static void throwsAsInt( int i ) { throw i; }
[[noreturn]] static void throwsDerivedException() {
throw DerivedException{};
}
class ExceptionMatcher
: public Catch::Matchers::MatcherBase<SpecialException> {
int m_expected;
public:
ExceptionMatcher( int i ): m_expected( i ) {}
bool match( SpecialException const& se ) const override {
return se.i == m_expected;
}
std::string describe() const override {
std::ostringstream ss;
ss << "special exception has value of " << m_expected;
return ss.str();
}
};
using namespace Catch::Matchers;
#ifdef __DJGPP__
static float nextafter( float from, float to ) {
return ::nextafterf( from, to );
}
static double nextafter( double from, double to ) {
return ::nextafter( from, to );
}
#else
using std::nextafter;
#endif
} // end unnamed namespace
TEST_CASE( "String matchers", "[matchers]" ) {
REQUIRE_THAT( testStringForMatching(), Contains( "string" ) );
REQUIRE_THAT( testStringForMatching(),
Contains( "string", Catch::CaseSensitive::No ) );
CHECK_THAT( testStringForMatching(), Contains( "abc" ) );
CHECK_THAT( testStringForMatching(),
Contains( "aBC", Catch::CaseSensitive::No ) );
CHECK_THAT( testStringForMatching(), StartsWith( "this" ) );
CHECK_THAT( testStringForMatching(),
StartsWith( "THIS", Catch::CaseSensitive::No ) );
CHECK_THAT( testStringForMatching(), EndsWith( "substring" ) );
CHECK_THAT( testStringForMatching(),
EndsWith( " SuBsTrInG", Catch::CaseSensitive::No ) );
}
TEST_CASE( "Contains string matcher", "[.][failing][matchers]" ) {
CHECK_THAT( testStringForMatching(),
Contains( "not there", Catch::CaseSensitive::No ) );
CHECK_THAT( testStringForMatching(), Contains( "STRING" ) );
}
TEST_CASE( "StartsWith string matcher", "[.][failing][matchers]" ) {
CHECK_THAT( testStringForMatching(), StartsWith( "This String" ) );
CHECK_THAT( testStringForMatching(),
StartsWith( "string", Catch::CaseSensitive::No ) );
}
TEST_CASE( "EndsWith string matcher", "[.][failing][matchers]" ) {
CHECK_THAT( testStringForMatching(), EndsWith( "Substring" ) );
CHECK_THAT( testStringForMatching(),
EndsWith( "this", Catch::CaseSensitive::No ) );
}
TEST_CASE( "Equals string matcher", "[.][failing][matchers]" ) {
CHECK_THAT( testStringForMatching(),
Equals( "this string contains 'ABC' as a substring" ) );
CHECK_THAT( testStringForMatching(),
Equals( "something else", Catch::CaseSensitive::No ) );
}
TEST_CASE( "Equals", "[matchers]" ) {
CHECK_THAT( testStringForMatching(),
Equals( "this string contains 'abc' as a substring" ) );
CHECK_THAT( testStringForMatching(),
Equals( "this string contains 'ABC' as a substring",
Catch::CaseSensitive::No ) );
}
TEST_CASE( "Regex string matcher -- libstdc++-4.8 workaround",
"[matchers][approvals]" ) {
// DJGPP has similar problem with its regex support as libstdc++ 4.8
#ifndef __DJGPP__
REQUIRE_THAT( testStringForMatching(),
Matches( "this string contains 'abc' as a substring" ) );
REQUIRE_THAT( testStringForMatching(),
Matches( "this string CONTAINS 'abc' as a substring",
Catch::CaseSensitive::No ) );
REQUIRE_THAT( testStringForMatching(),
Matches( "^this string contains 'abc' as a substring$" ) );
REQUIRE_THAT( testStringForMatching(), Matches( "^.* 'abc' .*$" ) );
REQUIRE_THAT( testStringForMatching(),
Matches( "^.* 'ABC' .*$", Catch::CaseSensitive::No ) );
#endif
REQUIRE_THAT( testStringForMatching2(),
!Matches( "this string contains 'abc' as a substring" ) );
}
TEST_CASE( "Regex string matcher", "[matchers][.failing]" ) {
CHECK_THAT( testStringForMatching(),
Matches( "this STRING contains 'abc' as a substring" ) );
CHECK_THAT( testStringForMatching(),
Matches( "contains 'abc' as a substring" ) );
CHECK_THAT( testStringForMatching(),
Matches( "this string contains 'abc' as a" ) );
}
TEST_CASE( "Matchers can be (AllOf) composed with the && operator",
"[matchers][operators][operator&&]" ) {
CHECK_THAT( testStringForMatching(),
Contains( "string" ) && Contains( "abc" ) &&
Contains( "substring" ) && Contains( "contains" ) );
}
TEST_CASE( "Matchers can be (AnyOf) composed with the || operator",
"[matchers][operators][operator||]" ) {
CHECK_THAT( testStringForMatching(),
Contains( "string" ) || Contains( "different" ) ||
Contains( "random" ) );
CHECK_THAT( testStringForMatching2(),
Contains( "string" ) || Contains( "different" ) ||
Contains( "random" ) );
}
TEST_CASE( "Matchers can be composed with both && and ||",
"[matchers][operators][operator||][operator&&]" ) {
CHECK_THAT( testStringForMatching(),
( Contains( "string" ) || Contains( "different" ) ) &&
Contains( "substring" ) );
}
TEST_CASE( "Matchers can be composed with both && and || - failing",
"[matchers][operators][operator||][operator&&][.failing]" ) {
CHECK_THAT( testStringForMatching(),
( Contains( "string" ) || Contains( "different" ) ) &&
Contains( "random" ) );
}
TEST_CASE( "Matchers can be negated (Not) with the ! operator",
"[matchers][operators][not]" ) {
CHECK_THAT( testStringForMatching(), !Contains( "different" ) );
}
TEST_CASE( "Matchers can be negated (Not) with the ! operator - failing",
"[matchers][operators][not][.failing]" ) {
CHECK_THAT( testStringForMatching(), !Contains( "substring" ) );
}
template <typename T> struct CustomAllocator : private std::allocator<T> {
using size_type = size_t;
using difference_type = ptrdiff_t;
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using value_type = T;
template <typename U> struct rebind { using other = CustomAllocator<U>; };
using propagate_on_container_move_assignment = std::true_type;
using is_always_equal = std::true_type;
CustomAllocator() = default;
CustomAllocator( const CustomAllocator& other ):
std::allocator<T>( other ) {}
template <typename U> CustomAllocator( const CustomAllocator<U>& ) {}
~CustomAllocator() = default;
using std::allocator<T>::allocate;
using std::allocator<T>::deallocate;
};
TEST_CASE( "Vector matchers", "[matchers][vector]" ) {
std::vector<int> v;
v.push_back( 1 );
v.push_back( 2 );
v.push_back( 3 );
std::vector<int> v2;
v2.push_back( 1 );
v2.push_back( 2 );
std::vector<double> v3;
v3.push_back( 1 );
v3.push_back( 2 );
v3.push_back( 3 );
std::vector<double> v4;
v4.push_back( 1 + 1e-8 );
v4.push_back( 2 + 1e-8 );
v4.push_back( 3 + 1e-8 );
std::vector<int, CustomAllocator<int>> v5;
v5.push_back( 1 );
v5.push_back( 2 );
v5.push_back( 3 );
std::vector<int, CustomAllocator<int>> v6;
v6.push_back( 1 );
v6.push_back( 2 );
std::vector<int> empty;
SECTION( "Contains (element)" ) {
CHECK_THAT( v, VectorContains( 1 ) );
CHECK_THAT( v, VectorContains( 2 ) );
CHECK_THAT( v5, ( VectorContains<int, CustomAllocator<int>>( 2 ) ) );
}
SECTION( "Contains (vector)" ) {
CHECK_THAT( v, Contains( v2 ) );
CHECK_THAT( v, Contains<int>( { 1, 2 } ) );
CHECK_THAT( v5,
( Contains<int, std::allocator<int>, CustomAllocator<int>>(
v2 ) ) );
v2.push_back( 3 ); // now exactly matches
CHECK_THAT( v, Contains( v2 ) );
CHECK_THAT( v, Contains( empty ) );
CHECK_THAT( empty, Contains( empty ) );
CHECK_THAT( v5,
( Contains<int, std::allocator<int>, CustomAllocator<int>>(
v2 ) ) );
CHECK_THAT( v5, Contains( v6 ) );
}
SECTION( "Contains (element), composed" ) {
CHECK_THAT( v, VectorContains( 1 ) && VectorContains( 2 ) );
}
SECTION( "Equals" ) {
// Same vector
CHECK_THAT( v, Equals( v ) );
CHECK_THAT( empty, Equals( empty ) );
// Different vector with same elements
CHECK_THAT( v, Equals<int>( { 1, 2, 3 } ) );
v2.push_back( 3 );
CHECK_THAT( v, Equals( v2 ) );
CHECK_THAT(
v5,
( Equals<int, std::allocator<int>, CustomAllocator<int>>( v2 ) ) );
v6.push_back( 3 );
CHECK_THAT( v5, Equals( v6 ) );
}
SECTION( "UnorderedEquals" ) {
CHECK_THAT( v, UnorderedEquals( v ) );
CHECK_THAT( v, UnorderedEquals<int>( { 3, 2, 1 } ) );
CHECK_THAT( empty, UnorderedEquals( empty ) );
auto permuted = v;
std::next_permutation( begin( permuted ), end( permuted ) );
REQUIRE_THAT( permuted, UnorderedEquals( v ) );
std::reverse( begin( permuted ), end( permuted ) );
REQUIRE_THAT( permuted, UnorderedEquals( v ) );
CHECK_THAT(
v5,
( UnorderedEquals<int, std::allocator<int>, CustomAllocator<int>>(
permuted ) ) );
auto v5_permuted = v5;
std::next_permutation( begin( v5_permuted ), end( v5_permuted ) );
CHECK_THAT( v5_permuted, UnorderedEquals( v5 ) );
}
}
TEST_CASE( "Vector matchers that fail", "[matchers][vector][.][failing]" ) {
std::vector<int> v;
v.push_back( 1 );
v.push_back( 2 );
v.push_back( 3 );
std::vector<int> v2;
v2.push_back( 1 );
v2.push_back( 2 );
std::vector<double> v3;
v3.push_back( 1 );
v3.push_back( 2 );
v3.push_back( 3 );
std::vector<double> v4;
v4.push_back( 1.1 );
v4.push_back( 2.1 );
v4.push_back( 3.1 );
std::vector<int> empty;
SECTION( "Contains (element)" ) {
CHECK_THAT( v, VectorContains( -1 ) );
CHECK_THAT( empty, VectorContains( 1 ) );
}
SECTION( "Contains (vector)" ) {
CHECK_THAT( empty, Contains( v ) );
v2.push_back( 4 );
CHECK_THAT( v, Contains( v2 ) );
}
SECTION( "Equals" ) {
CHECK_THAT( v, Equals( v2 ) );
CHECK_THAT( v2, Equals( v ) );
CHECK_THAT( empty, Equals( v ) );
CHECK_THAT( v, Equals( empty ) );
}
SECTION( "UnorderedEquals" ) {
CHECK_THAT( v, UnorderedEquals( empty ) );
CHECK_THAT( empty, UnorderedEquals( v ) );
auto permuted = v;
std::next_permutation( begin( permuted ), end( permuted ) );
permuted.pop_back();
CHECK_THAT( permuted, UnorderedEquals( v ) );
std::reverse( begin( permuted ), end( permuted ) );
CHECK_THAT( permuted, UnorderedEquals( v ) );
}
}
TEST_CASE( "Exception matchers that succeed",
"[matchers][exceptions][!throws]" ) {
CHECK_THROWS_MATCHES(
throwsSpecialException( 1 ), SpecialException, ExceptionMatcher{ 1 } );
REQUIRE_THROWS_MATCHES(
throwsSpecialException( 2 ), SpecialException, ExceptionMatcher{ 2 } );
}
TEST_CASE( "Exception matchers that fail",
"[matchers][exceptions][!throws][.failing]" ) {
SECTION( "No exception" ) {
CHECK_THROWS_MATCHES(
doesNotThrow(), SpecialException, ExceptionMatcher{ 1 } );
REQUIRE_THROWS_MATCHES(
doesNotThrow(), SpecialException, ExceptionMatcher{ 1 } );
}
SECTION( "Type mismatch" ) {
CHECK_THROWS_MATCHES(
throwsAsInt( 1 ), SpecialException, ExceptionMatcher{ 1 } );
REQUIRE_THROWS_MATCHES(
throwsAsInt( 1 ), SpecialException, ExceptionMatcher{ 1 } );
}
SECTION( "Contents are wrong" ) {
CHECK_THROWS_MATCHES( throwsSpecialException( 3 ),
SpecialException,
ExceptionMatcher{ 1 } );
REQUIRE_THROWS_MATCHES( throwsSpecialException( 4 ),
SpecialException,
ExceptionMatcher{ 1 } );
}
}
TEST_CASE( "Floating point matchers: float", "[matchers][floating-point]" ) {
SECTION( "Relative" ) {
REQUIRE_THAT( 10.f, WithinRel( 11.1f, 0.1f ) );
REQUIRE_THAT( 10.f, !WithinRel( 11.2f, 0.1f ) );
REQUIRE_THAT( 1.f, !WithinRel( 0.f, 0.99f ) );
REQUIRE_THAT( -0.f, WithinRel( 0.f ) );
SECTION( "Some subnormal values" ) {
auto v1 = std::numeric_limits<float>::min();
auto v2 = v1;
for ( int i = 0; i < 5; ++i ) {
v2 = std::nextafter( v1, 0.f );
}
REQUIRE_THAT( v1, WithinRel( v2 ) );
}
}
SECTION( "Margin" ) {
REQUIRE_THAT( 1.f, WithinAbs( 1.f, 0 ) );
REQUIRE_THAT( 0.f, WithinAbs( 1.f, 1 ) );
REQUIRE_THAT( 0.f, !WithinAbs( 1.f, 0.99f ) );
REQUIRE_THAT( 0.f, !WithinAbs( 1.f, 0.99f ) );
REQUIRE_THAT( 0.f, WithinAbs( -0.f, 0 ) );
REQUIRE_THAT( 11.f, !WithinAbs( 10.f, 0.5f ) );
REQUIRE_THAT( 10.f, !WithinAbs( 11.f, 0.5f ) );
REQUIRE_THAT( -10.f, WithinAbs( -10.f, 0.5f ) );
REQUIRE_THAT( -10.f, WithinAbs( -9.6f, 0.5f ) );
}
SECTION( "ULPs" ) {
REQUIRE_THAT( 1.f, WithinULP( 1.f, 0 ) );
REQUIRE_THAT( nextafter( 1.f, 2.f ), WithinULP( 1.f, 1 ) );
REQUIRE_THAT( 0.f, WithinULP( nextafter( 0.f, 1.f ), 1 ) );
REQUIRE_THAT( 1.f, WithinULP( nextafter( 1.f, 0.f ), 1 ) );
REQUIRE_THAT( 1.f, !WithinULP( nextafter( 1.f, 2.f ), 0 ) );
REQUIRE_THAT( 1.f, WithinULP( 1.f, 0 ) );
REQUIRE_THAT( -0.f, WithinULP( 0.f, 0 ) );
}
SECTION( "Composed" ) {
REQUIRE_THAT( 1.f, WithinAbs( 1.f, 0.5 ) || WithinULP( 1.f, 1 ) );
REQUIRE_THAT( 1.f, WithinAbs( 2.f, 0.5 ) || WithinULP( 1.f, 0 ) );
REQUIRE_THAT( 0.0001f,
WithinAbs( 0.f, 0.001f ) || WithinRel( 0.f, 0.1f ) );
}
SECTION( "Constructor validation" ) {
REQUIRE_NOTHROW( WithinAbs( 1.f, 0.f ) );
REQUIRE_THROWS_AS( WithinAbs( 1.f, -1.f ), std::domain_error );
REQUIRE_NOTHROW( WithinULP( 1.f, 0 ) );
REQUIRE_THROWS_AS( WithinULP( 1.f, static_cast<uint64_t>( -1 ) ),
std::domain_error );
REQUIRE_NOTHROW( WithinRel( 1.f, 0.f ) );
REQUIRE_THROWS_AS( WithinRel( 1.f, -0.2f ), std::domain_error );
REQUIRE_THROWS_AS( WithinRel( 1.f, 1.f ), std::domain_error );
}
}
TEST_CASE( "Floating point matchers: double", "[matchers][floating-point]" ) {
SECTION( "Relative" ) {
REQUIRE_THAT( 10., WithinRel( 11.1, 0.1 ) );
REQUIRE_THAT( 10., !WithinRel( 11.2, 0.1 ) );
REQUIRE_THAT( 1., !WithinRel( 0., 0.99 ) );
REQUIRE_THAT( -0., WithinRel( 0. ) );
SECTION( "Some subnormal values" ) {
auto v1 = std::numeric_limits<double>::min();
auto v2 = v1;
for ( int i = 0; i < 5; ++i ) {
v2 = std::nextafter( v1, 0 );
}
REQUIRE_THAT( v1, WithinRel( v2 ) );
}
}
SECTION( "Margin" ) {
REQUIRE_THAT( 1., WithinAbs( 1., 0 ) );
REQUIRE_THAT( 0., WithinAbs( 1., 1 ) );
REQUIRE_THAT( 0., !WithinAbs( 1., 0.99 ) );
REQUIRE_THAT( 0., !WithinAbs( 1., 0.99 ) );
REQUIRE_THAT( 11., !WithinAbs( 10., 0.5 ) );
REQUIRE_THAT( 10., !WithinAbs( 11., 0.5 ) );
REQUIRE_THAT( -10., WithinAbs( -10., 0.5 ) );
REQUIRE_THAT( -10., WithinAbs( -9.6, 0.5 ) );
}
SECTION( "ULPs" ) {
REQUIRE_THAT( 1., WithinULP( 1., 0 ) );
REQUIRE_THAT( nextafter( 1., 2. ), WithinULP( 1., 1 ) );
REQUIRE_THAT( 0., WithinULP( nextafter( 0., 1. ), 1 ) );
REQUIRE_THAT( 1., WithinULP( nextafter( 1., 0. ), 1 ) );
REQUIRE_THAT( 1., !WithinULP( nextafter( 1., 2. ), 0 ) );
REQUIRE_THAT( 1., WithinULP( 1., 0 ) );
REQUIRE_THAT( -0., WithinULP( 0., 0 ) );
}
SECTION( "Composed" ) {
REQUIRE_THAT( 1., WithinAbs( 1., 0.5 ) || WithinULP( 2., 1 ) );
REQUIRE_THAT( 1., WithinAbs( 2., 0.5 ) || WithinULP( 1., 0 ) );
REQUIRE_THAT( 0.0001, WithinAbs( 0., 0.001 ) || WithinRel( 0., 0.1 ) );
}
SECTION( "Constructor validation" ) {
REQUIRE_NOTHROW( WithinAbs( 1., 0. ) );
REQUIRE_THROWS_AS( WithinAbs( 1., -1. ), std::domain_error );
REQUIRE_NOTHROW( WithinULP( 1., 0 ) );
REQUIRE_NOTHROW( WithinRel( 1., 0. ) );
REQUIRE_THROWS_AS( WithinRel( 1., -0.2 ), std::domain_error );
REQUIRE_THROWS_AS( WithinRel( 1., 1. ), std::domain_error );
}
}
TEST_CASE( "Floating point matchers that are problematic in approvals",
"[approvals][matchers][floating-point]" ) {
REQUIRE_THAT( NAN, !WithinAbs( NAN, 0 ) );
REQUIRE_THAT( NAN, !( WithinAbs( NAN, 100 ) || WithinULP( NAN, 123 ) ) );
REQUIRE_THAT( NAN, !WithinULP( NAN, 123 ) );
REQUIRE_THAT( INFINITY, WithinRel( INFINITY ) );
REQUIRE_THAT( -INFINITY, !WithinRel( INFINITY ) );
REQUIRE_THAT( 1., !WithinRel( INFINITY ) );
REQUIRE_THAT( INFINITY, !WithinRel( 1. ) );
REQUIRE_THAT( NAN, !WithinRel( NAN ) );
REQUIRE_THAT( 1., !WithinRel( NAN ) );
REQUIRE_THAT( NAN, !WithinRel( 1. ) );
}
TEST_CASE( "Arbitrary predicate matcher", "[matchers][generic]" ) {
SECTION( "Function pointer" ) {
REQUIRE_THAT( 1, Predicate<int>( alwaysTrue, "always true" ) );
REQUIRE_THAT( 1, !Predicate<int>( alwaysFalse, "always false" ) );
}
SECTION( "Lambdas + different type" ) {
REQUIRE_THAT( "Hello olleH",
Predicate<std::string>(
[]( std::string const& str ) -> bool {
return str.front() == str.back();
},
"First and last character should be equal" ) );
REQUIRE_THAT(
"This wouldn't pass",
!Predicate<std::string>( []( std::string const& str ) -> bool {
return str.front() == str.back();
} ) );
}
}
TEST_CASE( "Regression test #1", "[matchers][vector]" ) {
// At some point, UnorderedEqualsMatcher skipped
// mismatched prefixed before doing the comparison itself
std::vector<char> actual = { 'a', 'b' };
std::vector<char> expected = { 'c', 'b' };
CHECK_THAT( actual, !UnorderedEquals( expected ) );
}
TEST_CASE( "Predicate matcher can accept const char*",
"[matchers][compilation]" ) {
REQUIRE_THAT( "foo", Predicate<const char*>( []( const char* const& ) {
return true;
} ) );
}
TEST_CASE( "Vector Approx matcher", "[matchers][approx][vector]" ) {
using Catch::Matchers::Approx;
SECTION( "Empty vector is roughly equal to an empty vector" ) {
std::vector<double> empty;
REQUIRE_THAT( empty, Approx( empty ) );
}
SECTION( "Vectors with elements" ) {
std::vector<double> v1( { 1., 2., 3. } );
SECTION( "A vector is approx equal to itself" ) {
REQUIRE_THAT( v1, Approx( v1 ) );
REQUIRE_THAT( v1, Approx<double>( { 1., 2., 3. } ) );
}
std::vector<double> v2( { 1.5, 2.5, 3.5 } );
SECTION( "Different length" ) {
auto temp( v1 );
temp.push_back( 4 );
REQUIRE_THAT( v1, !Approx( temp ) );
}
SECTION( "Same length, different elements" ) {
REQUIRE_THAT( v1, !Approx( v2 ) );
REQUIRE_THAT( v1, Approx( v2 ).margin( 0.5 ) );
REQUIRE_THAT( v1, Approx( v2 ).epsilon( 0.5 ) );
REQUIRE_THAT( v1, Approx( v2 ).epsilon( 0.1 ).scale( 500 ) );
}
}
}
TEST_CASE( "Vector Approx matcher -- failing",
"[matchers][approx][vector][.failing]" ) {
using Catch::Matchers::Approx;
SECTION( "Empty and non empty vectors are not approx equal" ) {
std::vector<double> empty, t1( { 1, 2 } );
CHECK_THAT( empty, Approx( t1 ) );
}
SECTION( "Just different vectors" ) {
std::vector<double> v1( { 2., 4., 6. } ), v2( { 1., 3., 5. } );
CHECK_THAT( v1, Approx( v2 ) );
}
}
TEST_CASE( "Exceptions matchers", "[matchers][exceptions][!throws]" ) {
REQUIRE_THROWS_MATCHES( throwsDerivedException(),
DerivedException,
Message( "DerivedException::what" ) );
REQUIRE_THROWS_MATCHES( throwsDerivedException(),
DerivedException,
!Message( "derivedexception::what" ) );
REQUIRE_THROWS_MATCHES( throwsSpecialException( 2 ),
SpecialException,
!Message( "DerivedException::what" ) );
REQUIRE_THROWS_MATCHES( throwsSpecialException( 2 ),
SpecialException,
Message( "SpecialException::what" ) );
}
struct CheckedTestingMatcher : Catch::Matchers::MatcherBase<int> {
mutable bool matchCalled = false;
bool matchSucceeds = false;
bool match( int const& ) const override {
matchCalled = true;
return matchSucceeds;
}
std::string describe() const override {
return "CheckedTestingMatcher set to " +
( matchSucceeds ? std::string( "succeed" )
: std::string( "fail" ) );
}
};
TEST_CASE( "Composed matchers shortcircuit", "[matchers][composed]" ) {
// Check that if first returns false, second is not touched
CheckedTestingMatcher first, second;
SECTION( "MatchAllOf" ) {
first.matchSucceeds = false;
Detail::MatchAllOf<int> matcher =
Detail::MatchAllOf<int>{} && first && second;
CHECK_FALSE( matcher.match( 1 ) );
// These two assertions are the important ones
REQUIRE( first.matchCalled );
REQUIRE( !second.matchCalled );
}
// Check that if first returns true, second is not touched
SECTION( "MatchAnyOf" ) {
first.matchSucceeds = true;
Detail::MatchAnyOf<int> matcher =
Detail::MatchAnyOf<int>{} || first || second;
CHECK( matcher.match( 1 ) );
// These two assertions are the important ones
REQUIRE( first.matchCalled );
REQUIRE( !second.matchCalled );
}
}
struct CheckedTestingGenericMatcher : Catch::Matchers::MatcherGenericBase {
mutable bool matchCalled = false;
bool matchSucceeds = false;
bool match( int const& ) const {
matchCalled = true;
return matchSucceeds;
}
std::string describe() const override {
return "CheckedTestingGenericMatcher set to " +
( matchSucceeds ? std::string( "succeed" )
: std::string( "fail" ) );
}
};
TEST_CASE( "Composed generic matchers shortcircuit",
"[matchers][composed][generic]" ) {
// Check that if first returns false, second is not touched
CheckedTestingGenericMatcher first, second;
SECTION( "MatchAllOf" ) {
first.matchSucceeds = false;
Detail::MatchAllOfGeneric<CheckedTestingGenericMatcher,
CheckedTestingGenericMatcher>
matcher{ first, second };
CHECK_FALSE( matcher.match( 1 ) );
// These two assertions are the important ones
REQUIRE( first.matchCalled );
REQUIRE( !second.matchCalled );
}
// Check that if first returns true, second is not touched
SECTION( "MatchAnyOf" ) {
first.matchSucceeds = true;
Detail::MatchAnyOfGeneric<CheckedTestingGenericMatcher,
CheckedTestingGenericMatcher>
matcher{ first, second };
CHECK( matcher.match( 1 ) );
// These two assertions are the important ones
REQUIRE( first.matchCalled );
REQUIRE( !second.matchCalled );
}
}
template <typename Range>
struct EqualsRangeMatcher : Catch::Matchers::MatcherGenericBase {
EqualsRangeMatcher( Range const& range ): m_range{ range } {}
template <typename OtherRange> bool match( OtherRange const& other ) const {
using std::begin;
using std::end;
return std::equal(
begin( m_range ), end( m_range ), begin( other ), end( other ) );
}
std::string describe() const override {
return "Equals: " + Catch::rangeToString( m_range );
}
private:
Range const& m_range;
};
template <typename Range>
auto EqualsRange( const Range& range ) -> EqualsRangeMatcher<Range> {
return EqualsRangeMatcher<Range>{ range };
}
TEST_CASE( "Combining templated matchers", "[matchers][templated]" ) {
std::array<int, 3> container{ { 1, 2, 3 } };
std::array<int, 3> a{ { 1, 2, 3 } };
std::vector<int> b{ 0, 1, 2 };
std::list<int> c{ 4, 5, 6 };
REQUIRE_THAT( container,
EqualsRange( a ) || EqualsRange( b ) || EqualsRange( c ) );
}
TEST_CASE( "Combining templated and concrete matchers",
"[matchers][templated]" ) {
std::vector<int> vec{ 1, 3, 5 };
std::array<int, 3> a{ { 5, 3, 1 } };
REQUIRE_THAT( vec,
Predicate<std::vector<int>>(
[]( auto const& v ) {
return std::all_of(
v.begin(), v.end(), []( int elem ) {
return elem % 2 == 1;
} );
},
"All elements are odd" ) &&
!EqualsRange( a ) );
const std::string str = "foobar";
const std::array<char, 6> arr{ { 'f', 'o', 'o', 'b', 'a', 'r' } };
const std::array<char, 6> bad_arr{ { 'o', 'o', 'f', 'b', 'a', 'r' } };
using Catch::Matchers::EndsWith;
using Catch::Matchers::StartsWith;
REQUIRE_THAT(
str, StartsWith( "foo" ) && EqualsRange( arr ) && EndsWith( "bar" ) );
REQUIRE_THAT( str,
StartsWith( "foo" ) && !EqualsRange( bad_arr ) &&
EndsWith( "bar" ) );
REQUIRE_THAT(
str, EqualsRange( arr ) && StartsWith( "foo" ) && EndsWith( "bar" ) );
REQUIRE_THAT( str,
!EqualsRange( bad_arr ) && StartsWith( "foo" ) &&
EndsWith( "bar" ) );
REQUIRE_THAT( str,
EqualsRange( bad_arr ) ||
( StartsWith( "foo" ) && EndsWith( "bar" ) ) );
REQUIRE_THAT( str,
( StartsWith( "foo" ) && EndsWith( "bar" ) ) ||
EqualsRange( bad_arr ) );
}
TEST_CASE( "Combining concrete matchers does not use templated matchers",
"[matchers][templated]" ) {
using Catch::Matchers::EndsWith;
using Catch::Matchers::StartsWith;
STATIC_REQUIRE(
std::is_same<decltype( StartsWith( "foo" ) ||
( StartsWith( "bar" ) && EndsWith( "bar" ) &&
!EndsWith( "foo" ) ) ),
Catch::Matchers::Detail::MatchAnyOf<std::string>>::value );
}
struct MatcherA : Catch::Matchers::MatcherGenericBase {
std::string describe() const override {
return "equals: (int) 1 or (float) 1.0f";
}
bool match( int i ) const { return i == 1; }
bool match( float f ) const { return f == 1.0f; }
};
struct MatcherB : Catch::Matchers::MatcherGenericBase {
std::string describe() const override { return "equals: (long long) 1"; }
bool match( long long l ) const { return l == 1ll; }
};
struct MatcherC : Catch::Matchers::MatcherGenericBase {
std::string describe() const override { return "equals: (T) 1"; }
template <typename T> bool match( T t ) const { return t == T{ 1 }; }
};
struct MatcherD : Catch::Matchers::MatcherGenericBase {
std::string describe() const override { return "equals: true"; }
bool match( bool b ) const { return b == true; }
};
TEST_CASE( "Combining only templated matchers", "[matchers][templated]" ) {
STATIC_REQUIRE(
std::is_same<decltype( MatcherA() || MatcherB() ),
Catch::Matchers::Detail::
MatchAnyOfGeneric<MatcherA, MatcherB>>::value );
REQUIRE_THAT( 1, MatcherA() || MatcherB() );
STATIC_REQUIRE(
std::is_same<decltype( MatcherA() && MatcherB() ),
Catch::Matchers::Detail::
MatchAllOfGeneric<MatcherA, MatcherB>>::value );
REQUIRE_THAT( 1, MatcherA() && MatcherB() );
STATIC_REQUIRE(
std::is_same<
decltype( MatcherA() || !MatcherB() ),
Catch::Matchers::Detail::MatchAnyOfGeneric<
MatcherA,
Catch::Matchers::Detail::MatchNotOfGeneric<MatcherB>>>::value );
REQUIRE_THAT( 1, MatcherA() || !MatcherB() );
}
TEST_CASE( "Combining MatchAnyOfGeneric does not nest",
"[matchers][templated]" ) {
// MatchAnyOfGeneric LHS + some matcher RHS
STATIC_REQUIRE(
std::is_same<
decltype( ( MatcherA() || MatcherB() ) || MatcherC() ),
Catch::Matchers::Detail::
MatchAnyOfGeneric<MatcherA, MatcherB, MatcherC>>::value );
REQUIRE_THAT( 1, ( MatcherA() || MatcherB() ) || MatcherC() );
// some matcher LHS + MatchAnyOfGeneric RHS
STATIC_REQUIRE(
std::is_same<
decltype( MatcherA() || ( MatcherB() || MatcherC() ) ),
Catch::Matchers::Detail::
MatchAnyOfGeneric<MatcherA, MatcherB, MatcherC>>::value );
REQUIRE_THAT( 1, MatcherA() || ( MatcherB() || MatcherC() ) );
// MatchAnyOfGeneric LHS + MatchAnyOfGeneric RHS
STATIC_REQUIRE(
std::is_same<
decltype( ( MatcherA() || MatcherB() ) ||
( MatcherC() || MatcherD() ) ),
Catch::Matchers::Detail::
MatchAnyOfGeneric<MatcherA, MatcherB, MatcherC, MatcherD>>::
value );
REQUIRE_THAT(
1, ( MatcherA() || MatcherB() ) || ( MatcherC() || MatcherD() ) );
}
TEST_CASE( "Combining MatchAllOfGeneric does not nest",
"[matchers][templated]" ) {
// MatchAllOfGeneric lhs + some matcher RHS
STATIC_REQUIRE(
std::is_same<
decltype( ( MatcherA() && MatcherB() ) && MatcherC() ),
Catch::Matchers::Detail::
MatchAllOfGeneric<MatcherA, MatcherB, MatcherC>>::value );
REQUIRE_THAT( 1, ( MatcherA() && MatcherB() ) && MatcherC() );
// some matcher LHS + MatchAllOfGeneric RSH
STATIC_REQUIRE(
std::is_same<
decltype( MatcherA() && ( MatcherB() && MatcherC() ) ),
Catch::Matchers::Detail::
MatchAllOfGeneric<MatcherA, MatcherB, MatcherC>>::value );
REQUIRE_THAT( 1, MatcherA() && ( MatcherB() && MatcherC() ) );
// MatchAllOfGeneric LHS + MatchAllOfGeneric RHS
STATIC_REQUIRE(
std::is_same<
decltype( ( MatcherA() && MatcherB() ) &&
( MatcherC() && MatcherD() ) ),
Catch::Matchers::Detail::
MatchAllOfGeneric<MatcherA, MatcherB, MatcherC, MatcherD>>::
value );
REQUIRE_THAT(
1, ( MatcherA() && MatcherB() ) && ( MatcherC() && MatcherD() ) );
}
TEST_CASE( "Combining MatchNotOfGeneric does not nest",
"[matchers][templated]" ) {
STATIC_REQUIRE(
std::is_same<
decltype( !MatcherA() ),
Catch::Matchers::Detail::MatchNotOfGeneric<MatcherA>>::value );
REQUIRE_THAT( 0, !MatcherA() );
STATIC_REQUIRE(
std::is_same<decltype( !!MatcherA() ), MatcherA const&>::value );
REQUIRE_THAT( 1, !!MatcherA() );
STATIC_REQUIRE(
std::is_same<
decltype( !!!MatcherA() ),
Catch::Matchers::Detail::MatchNotOfGeneric<MatcherA>>::value );
REQUIRE_THAT( 0, !!!MatcherA() );
STATIC_REQUIRE(
std::is_same<decltype( !!!!MatcherA() ), MatcherA const&>::value );
REQUIRE_THAT( 1, !!!!MatcherA() );
}
struct EvilAddressOfOperatorUsed : std::exception {
EvilAddressOfOperatorUsed() {}
const char* what() const noexcept override {
return "overloaded address-of operator of matcher was used instead of "
"std::addressof";
}
};
struct EvilCommaOperatorUsed : std::exception {
EvilCommaOperatorUsed() {}
const char* what() const noexcept override {
return "overloaded comma operator of matcher was used";
}
};
struct EvilMatcher : Catch::Matchers::MatcherGenericBase {
std::string describe() const override { return "equals: 45"; }
bool match( int i ) const { return i == 45; }
EvilMatcher const* operator&() const { throw EvilAddressOfOperatorUsed(); }
int operator,( EvilMatcher const& ) const { throw EvilCommaOperatorUsed(); }
};
TEST_CASE( "Overloaded comma or address-of operators are not used",
"[matchers][templated]" ) {
REQUIRE_THROWS_AS( ( EvilMatcher(), EvilMatcher() ),
EvilCommaOperatorUsed );
REQUIRE_THROWS_AS( &EvilMatcher(), EvilAddressOfOperatorUsed );
REQUIRE_NOTHROW( EvilMatcher() || ( EvilMatcher() && !EvilMatcher() ) );
REQUIRE_NOTHROW( ( EvilMatcher() && EvilMatcher() ) || !EvilMatcher() );
}
struct ImmovableMatcher : Catch::Matchers::MatcherGenericBase {
ImmovableMatcher() = default;
ImmovableMatcher( ImmovableMatcher const& ) = delete;
ImmovableMatcher( ImmovableMatcher&& ) = delete;
ImmovableMatcher& operator=( ImmovableMatcher const& ) = delete;
ImmovableMatcher& operator=( ImmovableMatcher&& ) = delete;
std::string describe() const override { return "always false"; }
template <typename T> bool match( T&& ) const { return false; }
};
struct MatcherWasMovedOrCopied : std::exception {
MatcherWasMovedOrCopied() {}
const char* what() const noexcept override {
return "attempted to copy or move a matcher";
}
};
struct ThrowOnCopyOrMoveMatcher : Catch::Matchers::MatcherGenericBase {
ThrowOnCopyOrMoveMatcher() = default;
[[noreturn]] ThrowOnCopyOrMoveMatcher( ThrowOnCopyOrMoveMatcher const& ):
Catch::Matchers::MatcherGenericBase() {
throw MatcherWasMovedOrCopied();
}
[[noreturn]] ThrowOnCopyOrMoveMatcher( ThrowOnCopyOrMoveMatcher&& ):
Catch::Matchers::MatcherGenericBase() {
throw MatcherWasMovedOrCopied();
}
ThrowOnCopyOrMoveMatcher& operator=( ThrowOnCopyOrMoveMatcher const& ) {
throw MatcherWasMovedOrCopied();
}
ThrowOnCopyOrMoveMatcher& operator=( ThrowOnCopyOrMoveMatcher&& ) {
throw MatcherWasMovedOrCopied();
}
std::string describe() const override { return "always false"; }
template <typename T> bool match( T&& ) const { return false; }
};
TEST_CASE( "Matchers are not moved or copied",
"[matchers][templated][approvals]" ) {
REQUIRE_NOTHROW(
( ThrowOnCopyOrMoveMatcher() && ThrowOnCopyOrMoveMatcher() ) ||
!ThrowOnCopyOrMoveMatcher() );
}
TEST_CASE( "Immovable matchers can be used",
"[matchers][templated][approvals]" ) {
REQUIRE_THAT( 123,
( ImmovableMatcher() && ImmovableMatcher() ) ||
!ImmovableMatcher() );
}
struct ReferencingMatcher : Catch::Matchers::MatcherGenericBase {
std::string describe() const override { return "takes reference"; }
bool match( int& i ) const { return i == 22; }
};
TEST_CASE( "Matchers can take references",
"[matchers][templated][approvals]" ) {
REQUIRE_THAT( 22, ReferencingMatcher{} );
}
#ifdef __clang__
# pragma clang diagnostic pop
#endif
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