#include "pch.h"

#ifdef __cpp_lib_format

import std;

import winrt.Windows.Foundation;

//

// These tests confirm that std::format and std::formatter specializations work

// correctly when consumed via modules. Mirrors test/test_cpp20/format.cpp.

//

using namespace winrt;

using namespace Windows::Foundation;

TEST_CASE("module_format_hstring")

{

hstring str = L"World";

REQUIRE(std::format(L"Hello {}", str) == L"Hello World");

}

TEST_CASE("module_format_IStringable")

{

// Uri implements IStringable — exercises the generated

// std::formatter<IStringable, wchar_t> specialization through modules.

Uri uri(L"https://example.com/path");

IStringable stringable = uri;

REQUIRE(std::format(L"Visit: {}", stringable) == L"Visit: https://example.com/path");

}

TEST_CASE("module_format_projected_class")

{

// Exercises the generated std::formatter<Uri, wchar_t> specialization

// (inherits from formatter<IStringable>) through modules.

Uri uri(L"https://example.com");

REQUIRE(std::format(L"URL: {}", uri) == L"URL: https://example.com/");

}

#if __cpp_lib_format >= 202207L

TEST_CASE("module_format_winrt_format")

{

// winrt::format helper (C++23 formattable concept)

std::wstring str = L"World";

REQUIRE(winrt::format(L"Hello {}", str) == L"Hello World");

REQUIRE(winrt::format(L"C++/WinRT #{:d}", 1) == L"C++/WinRT #1");

}

#endif

#endif // __cpp_lib_format