catch2/tests/SelfTest/UsageTests/MatchersRanges.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_container_properties.hpp>
#include <catch2/matchers/catch_matchers_contains.hpp>
#include <catch2/matchers/catch_matchers_floating.hpp>
#include <array>
#include <cmath>
#include <list>
#include <map>
#include <vector>
namespace {
namespace unrelated {
class needs_ADL_begin {
std::array<int, 5> elements{ {1, 2, 3, 4, 5} };
public:
using iterator = std::array<int, 5>::iterator;
using const_iterator = std::array<int, 5>::const_iterator;
const_iterator Begin() const { return elements.begin(); }
const_iterator End() const { return elements.end(); }
friend const_iterator begin(needs_ADL_begin const& lhs) {
return lhs.Begin();
}
friend const_iterator end(needs_ADL_begin const& rhs) {
return rhs.End();
}
};
} // end unrelated namespace
} // end anon namespace
struct MoveOnlyTestElement {
int num = 0;
MoveOnlyTestElement(int n) :num(n) {}
MoveOnlyTestElement(MoveOnlyTestElement&& rhs) = default;
MoveOnlyTestElement& operator=(MoveOnlyTestElement&& rhs) = default;
friend bool operator==(MoveOnlyTestElement const& lhs, MoveOnlyTestElement const& rhs) {
return lhs.num == rhs.num;
}
friend std::ostream& operator<<(std::ostream& out, MoveOnlyTestElement const& elem) {
out << elem.num;
return out;
}
};
TEST_CASE("Basic use of the Contains range matcher", "[matchers][templated][contains]") {
using Catch::Matchers::Contains;
SECTION("Different argument ranges, same element type, default comparison") {
std::array<int, 3> a{ { 1,2,3 } };
std::vector<int> b{ 0,1,2 };
std::list<int> c{ 4,5,6 };
// A contains 1
REQUIRE_THAT(a, Contains(1));
// B contains 1
REQUIRE_THAT(b, Contains(1));
// C does not contain 1
REQUIRE_THAT(c, !Contains(1));
}
SECTION("Different argument ranges, same element type, custom comparison") {
std::array<int, 3> a{ { 1,2,3 } };
std::vector<int> b{ 0,1,2 };
std::list<int> c{ 4,5,6 };
auto close_enough = [](int lhs, int rhs) { return std::abs(lhs - rhs) <= 1; };
// A contains 1, which is "close enough" to 0
REQUIRE_THAT(a, Contains(0, close_enough));
// B contains 0 directly
REQUIRE_THAT(b, Contains(0, close_enough));
// C does not contain anything "close enough" to 0
REQUIRE_THAT(c, !Contains(0, close_enough));
}
SECTION("Different element type, custom comparisons") {
std::array<std::string, 3> a{ { "abc", "abcd" , "abcde" } };
REQUIRE_THAT(a, Contains(4, [](auto&& lhs, size_t sz) {
return lhs.size() == sz;
}));
}
SECTION("Can handle type that requires ADL-found free function begin and end") {
unrelated::needs_ADL_begin in;
REQUIRE_THAT(in, Contains(1));
REQUIRE_THAT(in, !Contains(8));
}
SECTION("Initialization with move only types") {
std::array<MoveOnlyTestElement, 3> in{ { MoveOnlyTestElement{ 1 }, MoveOnlyTestElement{ 2 }, MoveOnlyTestElement{ 3 } } };
REQUIRE_THAT(in, Contains(MoveOnlyTestElement{ 2 }));
REQUIRE_THAT(in, !Contains(MoveOnlyTestElement{ 9 }));
}
SECTION("Matching using matcher") {
std::array<double, 4> in{ {1, 2, 3} };
REQUIRE_THAT(in, Contains(Catch::Matchers::WithinAbs(0.5, 0.5)));
}
}
namespace {
struct has_empty {
bool empty() const { return false; }
};
namespace unrelated {
struct ADL_empty {
bool Empty() const { return true; }
friend bool empty(ADL_empty e) {
return e.Empty();
}
};
} // end namespace unrelated
} // end unnamed namespace
TEST_CASE("Basic use of the Empty range matcher", "[matchers][templated][empty]") {
using Catch::Matchers::IsEmpty;
SECTION("Simple, std-provided containers") {
std::array<int, 0> empty_array{};
std::array<double, 1> non_empty_array{};
REQUIRE_THAT(empty_array, IsEmpty());
REQUIRE_THAT(non_empty_array, !IsEmpty());
std::vector<std::string> empty_vec;
std::vector<char> non_empty_vec{ 'a', 'b', 'c' };
REQUIRE_THAT(empty_vec, IsEmpty());
REQUIRE_THAT(non_empty_vec, !IsEmpty());
std::list<std::list<std::list<int>>> inner_lists_are_empty;
inner_lists_are_empty.push_back({});
REQUIRE_THAT(inner_lists_are_empty, !IsEmpty());
REQUIRE_THAT(inner_lists_are_empty.front(), IsEmpty());
}
SECTION("Type with empty") {
REQUIRE_THAT(has_empty{}, !IsEmpty());
}
SECTION("Type requires ADL found empty free function") {
REQUIRE_THAT(unrelated::ADL_empty{}, IsEmpty());
}
}
namespace {
class LessThanMatcher final : public Catch::Matchers::MatcherBase<size_t> {
size_t m_target;
public:
explicit LessThanMatcher(size_t target):
m_target(target)
{}
bool match(size_t const& size) const override {
return size < m_target;
}
std::string describe() const override {
return "is less than " + std::to_string(m_target);
}
};
LessThanMatcher Lt(size_t sz) {
return LessThanMatcher{ sz };
}
namespace unrelated {
struct ADL_size {
size_t sz() const {
return 12;
}
friend size_t size(ADL_size s) {
return s.sz();
}
};
} // end namespace unrelated
struct has_size {
size_t size() const {
return 13;
}
};
} // end unnamed namespace
TEST_CASE("Usage of the SizeIs range matcher", "[matchers][templated][size]") {
using Catch::Matchers::SizeIs;
SECTION("Some with stdlib containers") {
std::vector<int> empty_vec;
REQUIRE_THAT(empty_vec, SizeIs(0));
REQUIRE_THAT(empty_vec, !SizeIs(2));
REQUIRE_THAT(empty_vec, SizeIs(Lt(2)));
std::array<int, 2> arr{};
REQUIRE_THAT(arr, SizeIs(2));
REQUIRE_THAT(arr, SizeIs( Lt(3)));
REQUIRE_THAT(arr, !SizeIs(!Lt(3)));
std::map<int, int> map{ {1, 1}, {2, 2}, {3, 3} };
REQUIRE_THAT(map, SizeIs(3));
}
SECTION("Type requires ADL found size free function") {
REQUIRE_THAT(unrelated::ADL_size{}, SizeIs(12));
}
SECTION("Type has size member") {
REQUIRE_THAT(has_size{}, SizeIs(13));
}
}