371 lines
14 KiB
C++
371 lines
14 KiB
C++
/* Unit testing for outcomes
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(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (30 commits)
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifdef TESTING_WG21_EXPERIMENTAL_RESULT
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#include <boost/outcome/experimental/result.hpp>
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#define BOOST_OUTCOME_AUTO_TEST_CASE(...) BOOST_AUTO_TEST_CASE(__VA_ARGS__)
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#else
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#include <boost/outcome/result.hpp>
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#endif
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#include <boost/test/unit_test.hpp>
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#include <boost/test/unit_test_monitor.hpp>
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#include <iostream>
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#ifndef BOOST_NO_EXCEPTIONS
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// Custom error type with payload
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struct payload
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{
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boost::system::error_code ec;
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const char *str{nullptr};
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payload() = default;
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payload(boost::system::errc::errc_t _ec, const char *_str)
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: ec(make_error_code(_ec))
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, str(_str)
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{
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}
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};
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struct payload_exception : std::runtime_error
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{
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explicit payload_exception(const char *what)
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: std::runtime_error(what)
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{
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}
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};
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inline const boost::system::error_code &make_error_code(const payload &p)
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{
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return p.ec;
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}
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inline void outcome_throw_as_system_error_with_payload(const payload &p)
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{
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throw payload_exception(p.str);
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}
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#endif
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BOOST_OUTCOME_AUTO_TEST_CASE(works_result, "Tests that the result works as intended")
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{
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#ifdef TESTING_WG21_EXPERIMENTAL_RESULT
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using namespace std::experimental;
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using std::in_place_type;
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#else
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using namespace BOOST_OUTCOME_V2_NAMESPACE;
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#endif
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static_assert(std::is_constructible<result<long>, int>::value, "Sanity check that monad can be constructed from a value_type");
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static_assert(!std::is_constructible<result<result<long>>, int>::value, "Sanity check that outer monad can be constructed from an inner monad's value_type");
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static_assert(!std::is_constructible<result<result<result<long>>>, int>::value, "Sanity check that outer monad can be constructed from an inner inner monad's value_type");
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static_assert(!std::is_constructible<result<result<result<result<long>>>>, int>::value, "Sanity check that outer monad can be constructed from an inner inner monad's value_type");
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static_assert(std::is_constructible<result<int>, result<long>>::value, "Sanity check that compatible monads can be constructed from one another");
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static_assert(std::is_constructible<result<result<int>>, result<long>>::value, "Sanity check that outer monad can be constructed from a compatible monad");
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static_assert(!std::is_constructible<result<result<result<int>>>, result<long>>::value, "Sanity check that outer monad can be constructed from a compatible monad up to two nestings deep");
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static_assert(!std::is_constructible<result<result<result<result<int>>>>, result<long>>::value, "Sanity check that outer monad can be constructed from a compatible monad three or more nestings deep");
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static_assert(!std::is_constructible<result<std::string>, result<int>>::value, "Sanity check that incompatible monads cannot be constructed from one another");
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#ifndef TESTING_WG21_EXPERIMENTAL_RESULT
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static_assert(std::is_constructible<result<int>, result<void>>::value, "Sanity check that all monads can be constructed from a void monad");
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static_assert(std::is_constructible<result<result<int>>, result<void>>::value, "Sanity check that outer monad can be constructed from a compatible monad");
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static_assert(std::is_constructible<result<result<result<int>>>, result<void>>::value, "Sanity check that outer monad can be constructed from a compatible monad up to two nestings deep");
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static_assert(!std::is_constructible<result<void>, result<int>>::value, "Sanity check that incompatible monads cannot be constructed from one another");
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#endif
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static_assert(std::is_void<result<void>::value_type>::value, "Sanity check that result<void> has a void value_type");
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#ifndef TESTING_WG21_EXPERIMENTAL_RESULT
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static_assert(std::is_void<result<void, void>::error_type>::value, "Sanity check that result<void, void> has a void error_type");
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#endif
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static_assert(std::is_same<result<int>::value_type, int>::value, "Sanity check that result<int> has a int value_type");
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static_assert(std::is_same<result<int>::error_type, boost::system::error_code>::value, "Sanity check that result<int> has a error_code error_type");
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{ // errored int
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result<int> m(boost::system::errc::bad_address);
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BOOST_CHECK(!m);
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BOOST_CHECK(!m.has_value());
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BOOST_CHECK(m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK_THROW(m.value(), boost::system::system_error);
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BOOST_CHECK_NO_THROW(m.error());
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}
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{ // errored void
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result<void> m(boost::system::errc::bad_address);
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BOOST_CHECK(!m);
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BOOST_CHECK(!m.has_value());
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BOOST_CHECK(m.has_error());
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// BOOST_CHECK(!m.has_exception());
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#ifndef TESTING_WG21_EXPERIMENTAL_RESULT
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BOOST_CHECK_THROW(([&m]() -> void { return m.value(); }()), boost::system::system_error);
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#endif
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BOOST_CHECK_NO_THROW(m.error());
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}
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{ // valued int
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result<int> m(5);
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BOOST_CHECK(m);
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BOOST_CHECK(m.has_value());
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BOOST_CHECK(!m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK(m.value() == 5);
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m.value() = 6;
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BOOST_CHECK(m.value() == 6);
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BOOST_CHECK_THROW(m.error(), bad_result_access);
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}
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{ // valued bool
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result<bool> m(false);
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BOOST_CHECK(m);
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BOOST_CHECK(m.has_value());
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BOOST_CHECK(!m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK(m.value() == false);
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m.value() = true;
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BOOST_CHECK(m.value() == true);
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BOOST_CHECK_THROW(m.error(), bad_result_access);
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}
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{ // moves do not clear state
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result<std::string> m("niall");
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BOOST_CHECK(m);
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BOOST_CHECK(m.has_value());
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BOOST_CHECK(!m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK(m.value() == "niall");
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m.value() = "NIALL";
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BOOST_CHECK(m.value() == "NIALL");
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auto temp(std::move(m).value());
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BOOST_CHECK(temp == "NIALL");
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BOOST_CHECK(m.value().empty()); // NOLINT
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}
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{ // valued void
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result<void> m(in_place_type<void>);
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BOOST_CHECK(m);
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BOOST_CHECK(m.has_value());
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BOOST_CHECK(!m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK_NO_THROW(m.value()); // works, but type returned is unusable
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BOOST_CHECK_THROW(m.error(), bad_result_access);
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}
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{ // errored
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boost::system::error_code ec(5, boost::system::system_category());
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result<int> m(ec);
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BOOST_CHECK(!m);
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BOOST_CHECK(!m.has_value());
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BOOST_CHECK(m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK_THROW(m.value(), boost::system::system_error);
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BOOST_CHECK(m.error() == ec);
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}
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#if !defined(__APPLE__) || defined(__cpp_exceptions)
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{ // errored, custom
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boost::system::error_code ec(5, boost::system::system_category());
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auto e = boost::copy_exception(boost::system::system_error(ec)); // NOLINT
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result<int, boost::exception_ptr> m(e);
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BOOST_CHECK(!m);
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BOOST_CHECK(!m.has_value());
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BOOST_CHECK(m.has_error());
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// BOOST_CHECK(!m.has_exception());
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BOOST_CHECK_THROW(m.value(), boost::system::system_error);
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BOOST_CHECK(m.error() == e);
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}
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#endif
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#ifndef TESTING_WG21_EXPERIMENTAL_RESULT
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{ // custom error type
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struct Foo
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{
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};
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result<int, Foo> m(in_place_type<Foo>);
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BOOST_CHECK(!m);
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BOOST_CHECK(!m.has_value());
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BOOST_CHECK(m.has_error());
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// BOOST_CHECK(!m.has_exception());
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// BOOST_CHECK_NO_THROW(m.value());
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// BOOST_CHECK_NO_THROW(m.error());
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}
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if(false) // NOLINT
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{ // void, void is permitted, but is not constructible
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result<void, void> *m = nullptr;
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m->value();
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m->error();
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}
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#endif
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{
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// Deliberately define non-trivial operations
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struct udt
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{
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int _v{0};
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udt() = default;
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udt(udt &&o) noexcept : _v(o._v) {}
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udt(const udt &o) // NOLINT
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: _v(o._v)
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{
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}
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udt &operator=(udt &&o) noexcept
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{
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_v = o._v;
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return *this;
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}
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udt &operator=(const udt &o) // NOLINT
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{
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_v = o._v;
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return *this;
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}
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~udt() { _v = 0; }
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};
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// No default construction, no copy nor move
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struct udt2
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{
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udt2() = delete;
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udt2(udt2 &&) = delete;
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udt2(const udt2 &) = delete;
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udt2 &operator=(udt2 &&) = delete;
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udt2 &operator=(const udt2 &) = delete;
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explicit udt2(int /*unused*/) {}
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~udt2() = default;
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};
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// Can only be constructed via multiple args
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struct udt3
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{
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udt3() = delete;
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udt3(udt3 &&) = delete;
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udt3(const udt3 &) = delete;
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udt3 &operator=(udt3 &&) = delete;
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udt3 &operator=(const udt3 &) = delete;
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explicit udt3(int /*unused*/, const char * /*unused*/, std::nullptr_t /*unused*/) {}
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~udt3() = default;
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};
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result<int> a(5);
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result<int> b(make_error_code(boost::system::errc::invalid_argument));
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std::cout << sizeof(a) << std::endl; // 32 bytes
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if(false) // NOLINT
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{
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b.assume_value();
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a.assume_error();
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}
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#ifndef BOOST_NO_EXCEPTIONS
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try
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{
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b.value();
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std::cerr << "fail" << std::endl;
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std::terminate();
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}
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catch(const boost::system::system_error & /*unused*/)
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{
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}
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#endif
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static_assert(!std::is_default_constructible<decltype(a)>::value, "");
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static_assert(!std::is_nothrow_default_constructible<decltype(a)>::value, "");
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static_assert(std::is_copy_constructible<decltype(a)>::value, "");
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// Quality of implementation of std::optional is poor :(
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#ifndef TESTING_WG21_EXPERIMENTAL_RESULT
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static_assert(std::is_trivially_copy_constructible<decltype(a)>::value, "");
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static_assert(std::is_nothrow_copy_constructible<decltype(a)>::value, "");
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static_assert(std::is_copy_assignable<decltype(a)>::value, "");
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static_assert(std::is_trivially_copy_assignable<decltype(a)>::value, "");
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static_assert(std::is_nothrow_copy_assignable<decltype(a)>::value, "");
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#endif
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static_assert(std::is_trivially_destructible<decltype(a)>::value, "");
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static_assert(std::is_nothrow_destructible<decltype(a)>::value, "");
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// Test void compiles
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result<void> c(in_place_type<void>);
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result<void> c2(c);
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(void) c2;
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// Test a standard udt compiles
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result<udt> d(in_place_type<udt>);
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result<udt> d2(d);
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static_assert(!std::is_default_constructible<decltype(d)>::value, "");
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static_assert(!std::is_nothrow_default_constructible<decltype(d)>::value, "");
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static_assert(std::is_copy_constructible<decltype(d)>::value, "");
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static_assert(!std::is_trivially_copy_constructible<decltype(d)>::value, "");
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static_assert(!std::is_nothrow_copy_constructible<decltype(d)>::value, "");
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static_assert(std::is_copy_assignable<decltype(d)>::value, "");
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static_assert(!std::is_trivially_copy_assignable<decltype(d)>::value, "");
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static_assert(!std::is_nothrow_copy_assignable<decltype(d)>::value, "");
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static_assert(std::is_move_assignable<decltype(d)>::value, "");
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static_assert(!std::is_trivially_move_assignable<decltype(d)>::value, "");
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static_assert(std::is_nothrow_move_assignable<decltype(d)>::value, "");
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static_assert(!std::is_trivially_destructible<decltype(d)>::value, "");
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static_assert(std::is_nothrow_destructible<decltype(d)>::value, "");
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// Test a highly pathological udt compiles
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result<udt2> e(in_place_type<udt2>, 5);
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// result<udt2> e2(e);
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static_assert(!std::is_default_constructible<decltype(e)>::value, "");
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static_assert(!std::is_nothrow_default_constructible<decltype(e)>::value, "");
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static_assert(!std::is_copy_constructible<decltype(e)>::value, "");
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static_assert(!std::is_trivially_copy_constructible<decltype(e)>::value, "");
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static_assert(!std::is_nothrow_copy_constructible<decltype(e)>::value, "");
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static_assert(!std::is_copy_assignable<decltype(e)>::value, "");
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static_assert(!std::is_trivially_copy_assignable<decltype(e)>::value, "");
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static_assert(!std::is_nothrow_copy_assignable<decltype(e)>::value, "");
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static_assert(!std::is_move_assignable<decltype(e)>::value, "");
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static_assert(!std::is_trivially_move_assignable<decltype(e)>::value, "");
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static_assert(!std::is_nothrow_move_assignable<decltype(e)>::value, "");
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// Test a udt which can only be constructed in place compiles
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result<udt3> g(in_place_type<udt3>, 5, static_cast<const char *>("niall"), nullptr);
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// Does converting inplace construction also work?
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result<udt3> h(5, static_cast<const char *>("niall"), nullptr);
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result<udt3> i(ENOMEM, boost::system::generic_category());
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BOOST_CHECK(h.has_value());
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BOOST_CHECK(i.has_error());
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}
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// Test direct use of error code enum works
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{
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constexpr result<int, boost::system::errc::errc_t> a(5), b(boost::system::errc::invalid_argument);
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static_assert(a.value() == 5, "a is not 5");
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static_assert(b.error() == boost::system::errc::invalid_argument, "b is not errored");
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BOOST_CHECK_THROW(b.value(), boost::system::system_error);
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}
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#ifndef TESTING_WG21_EXPERIMENTAL_RESULT
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#ifndef BOOST_NO_EXCEPTIONS
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// Test payload facility
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{
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const char *niall = "niall";
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result<int, payload> b{boost::system::errc::invalid_argument, niall};
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try
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{
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b.value();
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BOOST_CHECK(false);
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}
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catch(const payload_exception &e)
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{
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BOOST_CHECK(!strcmp(e.what(), niall));
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}
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catch(...)
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{
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BOOST_CHECK(false);
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}
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}
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#endif
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#endif
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}
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