Add wide string formatting tests

Author: mborland

test/test_format.cpp

@@ -265,6 +265,42 @@ void test_locale_conversion(const char* locale, const std::string& result)
     // LCOV_EXCL_STOP
 }
 
+template <typename T>
+void test_wide_strings()
+{
+    BOOST_TEST(std::format(L"{}", T{1}) == L"1");
+    BOOST_TEST(std::format(L"{}", T{10}) == L"10");
+    BOOST_TEST(std::format(L"{}", T{100}) == L"100");
+    BOOST_TEST(std::format(L"{}", T{1000}) == L"1000");
+    BOOST_TEST(std::format(L"{}", T{10000}) == L"10000");
+    BOOST_TEST(std::format(L"{}", T{210000}) == L"210000");
+    BOOST_TEST(std::format(L"{}", T{2100000}) == L"2100000");
+
+    BOOST_TEST(std::format(u"{}", T{1}) == u"1");
+    BOOST_TEST(std::format(u"{}", T{10}) == u"10");
+    BOOST_TEST(std::format(u"{}", T{100}) == u"100");
+    BOOST_TEST(std::format(u"{}", T{1000}) == u"1000");
+    BOOST_TEST(std::format(u"{}", T{10000}) == u"10000");
+    BOOST_TEST(std::format(u"{}", T{210000}) == u"210000");
+    BOOST_TEST(std::format(u"{}", T{2100000}) == u"2100000");
+
+    BOOST_TEST(std::format(U"{}", T{1}) == U"1");
+    BOOST_TEST(std::format(U"{}", T{10}) == U"10");
+    BOOST_TEST(std::format(U"{}", T{100}) == U"100");
+    BOOST_TEST(std::format(U"{}", T{1000}) == U"1000");
+    BOOST_TEST(std::format(U"{}", T{10000}) == U"10000");
+    BOOST_TEST(std::format(U"{}", T{210000}) == U"210000");
+    BOOST_TEST(std::format(U"{}", T{2100000}) == U"2100000");
+
+    BOOST_TEST(std::format(u8"{}", T{1}) == u8"1");
+    BOOST_TEST(std::format(u8"{}", T{10}) == u8"10");
+    BOOST_TEST(std::format(u8"{}", T{100}) == u8"100");
+    BOOST_TEST(std::format(u8"{}", T{1000}) == u8"1000");
+    BOOST_TEST(std::format(u8"{}", T{10000}) == u8"10000");
+    BOOST_TEST(std::format(u8"{}", T{210000}) == u8"210000");
+    BOOST_TEST(std::format(u8"{}", T{2100000}) == u8"2100000");
+}
+
 int main()
 {
     test_general<decimal32_t>();
@@ -317,6 +353,13 @@ int main()
 
     #endif
 
+    test_wide_strings<decimal32_t>();
+    test_wide_strings<decimal_fast32_t>();
+    test_wide_strings<decimal64_t>();
+    test_wide_strings<decimal_fast64_t>();
+    test_wide_strings<decimal128_t>();
+    test_wide_strings<decimal_fast128_t>();
+
     return boost::report_errors();
 }