Function tests

loader/tests/src/test_platform.cpp:60–119

<!-- description --> @brief Used to execute the actual checks. We put the checks in this function so that we can validate the tests both at compile-time and at run-time. If a bsl::ut_check fails, the tests will either fail fast at run-time, or will produce a compile-time error. <!-- inputs/outputs --> @return Always returns bsl::exit_success.

    ///   @return Always returns bsl::exit_success.
    ///
    [[nodiscard]] constexpr auto
    tests() noexcept -> bsl::exit_code
    {
        helpers::init();

        bsl::ut_scenario{"platform_alloc success"} = [&]() noexcept {
            bsl::ut_given{} = [&]() noexcept {
                bsl::ut_when{} = [&]() noexcept {
                    auto const *const ptr{platform_alloc(HYPERVISOR_PAGE_SIZE)};
                    bsl::ut_then{} = [&]() noexcept {
                        bsl::ut_check(nullptr != ptr);
                    };
                    bsl::ut_cleanup{} = [&]() noexcept {
                        platform_free(ptr, HYPERVISOR_PAGE_SIZE);
                    };
                };
            };
        };

        bsl::ut_scenario{"platform_alloc non-aligned success"} = [&]() noexcept {
            bsl::ut_given{} = [&]() noexcept {
                constexpr auto size{0x2042_umx};
                bsl::ut_when{} = [&]() noexcept {
                    auto const *const ptr{platform_alloc(size.get())};
                    bsl::ut_then{} = [&]() noexcept {
                        bsl::ut_check(nullptr != ptr);
                    };
                    bsl::ut_cleanup{} = [&]() noexcept {
                        platform_free(ptr, HYPERVISOR_PAGE_SIZE);
                    };
                };
            };
        };

        bsl::ut_scenario{"platform_alloc fails"} = [&]() noexcept {
            bsl::ut_given{} = [&]() noexcept {
                bsl::ut_when{} = [&]() noexcept {
                    helpers::g_mut_platform_alloc = 1;
                    auto const *const ptr{platform_alloc(HYPERVISOR_PAGE_SIZE)};
                    bsl::ut_then{} = [&]() noexcept {
                        bsl::ut_check(nullptr == ptr);
                    };
                };
            };

            bsl::ut_given{} = [&]() noexcept {
                bsl::ut_when{} = [&]() noexcept {
                    helpers::g_mut_platform_alloc = 2;
                    auto const *const ptr1{platform_alloc(HYPERVISOR_PAGE_SIZE)};
                    auto const *const ptr2{platform_alloc(HYPERVISOR_PAGE_SIZE)};
                    bsl::ut_then{} = [&]() noexcept {
                        bsl::ut_check(nullptr != ptr1);
                        bsl::ut_check(nullptr == ptr2);
                    };
                    bsl::ut_cleanup{} = [&]() noexcept {
                        platform_free(ptr1, HYPERVISOR_PAGE_SIZE);
                    };
                };