test_handlers.h

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte.
 *
 * StormByte is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * or later, as published by the Free Software Foundation.
 *
 * StormByte is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with StormByte. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 */
 
#pragma once
 
#include <exception>
#include <filesystem>
#include <iostream>
#include <ostream>
#include <string_view>
 
namespace StormByte::Test::Detail {
    template<typename T>
    void PrintValue(std::ostream& stream, const T& value) {
        if constexpr (requires { stream << value; }) {
            stream << value;
        } else {
            stream << "<unprintable>";
        }
    }
}
 
#define RETURN_TEST(fn_name, fn_result) do { \
    const int stormbyte_test_result = (fn_result); \
    if (stormbyte_test_result != 0) { \
        std::cerr << "Test " << fn_name << " FAILED!" << std::endl; \
    } \
    return stormbyte_test_result; \
} while (false)
 
#define CurrentFileDirectory std::filesystem::path(__FILE__).parent_path()
 
#define ASSERT_EQUAL(fn_name, expected, actual) do { \
    const auto& stormbyte_expected = (expected); \
    const auto& stormbyte_actual = (actual); \
    if (!(stormbyte_expected == stormbyte_actual)) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": expected \""; \
        ::StormByte::Test::Detail::PrintValue(std::cerr, stormbyte_expected); \
        std::cerr << "\", got \""; \
        ::StormByte::Test::Detail::PrintValue(std::cerr, stormbyte_actual); \
        std::cerr << "\"" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_NOT_EQUAL(fn_name, expected, actual) do { \
    const auto& stormbyte_expected = (expected); \
    const auto& stormbyte_actual = (actual); \
    if (stormbyte_expected == stormbyte_actual) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": values should differ; both were \""; \
        ::StormByte::Test::Detail::PrintValue(std::cerr, stormbyte_actual); \
        std::cerr << "\"" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_FALSE(fn_name, condition) do { \
    if ((condition)) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": condition is true, expected false" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_TRUE(fn_name, condition) do { \
    if (!(condition)) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": condition is false, expected true" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_THROWS(fn_name, expression, exception_type) do { \
    bool stormbyte_threw = false; \
    try { \
        (void)(expression); \
    } catch (const exception_type&) { \
        stormbyte_threw = true; \
    } catch (...) { \
    } \
    if (!stormbyte_threw) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": expected " << #exception_type << " to be thrown" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_NO_THROW(fn_name, expression) do { \
    try { \
        (void)(expression); \
    } catch (const std::exception& stormbyte_exception) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": unexpected exception: " << stormbyte_exception.what() << std::endl; \
        return 1; \
    } catch (...) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": unexpected non-standard exception" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_NEAR(fn_name, expected, actual, tolerance) do { \
    const auto stormbyte_expected = (expected); \
    const auto stormbyte_actual = (actual); \
    const auto stormbyte_tolerance = (tolerance); \
    const auto stormbyte_difference = stormbyte_expected > stormbyte_actual ? \
        stormbyte_expected - stormbyte_actual : stormbyte_actual - stormbyte_expected; \
    if (stormbyte_difference > stormbyte_tolerance) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": values differ beyond tolerance" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_CONTAINS(fn_name, haystack, needle) do { \
    const auto& stormbyte_haystack = (haystack); \
    const auto& stormbyte_needle = (needle); \
    if (stormbyte_haystack.find(stormbyte_needle) == std::string_view::npos) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": expected text to contain \"" << stormbyte_needle << "\"" << std::endl; \
        return 1; \
    } \
} while (false)
 
#define ASSERT_NOT_NULL(fn_name, pointer) do { \
    if ((pointer) == nullptr) { \
        std::cerr << fn_name << ": Assertion failed at " << __FILE__ << ":" << __LINE__ << ": pointer is null" << std::endl; \
        return 1; \
    } \
} while (false)