Add test set

Author: mborland

test/Jamfile

@@ -88,3 +88,4 @@ run ../examples/charconv.cpp ;
 # Github Issues
 run github_issue_207.cpp ;
 run github_issue_210.cpp ;
+run github_issue_221.cpp ;

test/github_issue_221.cpp

@@ -0,0 +1,36 @@
+// Copyright 2025 Matt Borland
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+//
+// See: https://github.com/cppalliance/int128/issues/221
+
+#include <boost/int128.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <random>
+#include <limits>
+
+constexpr std::size_t N {1024u};
+static std::mt19937_64 gen(42);
+
+template <typename T>
+void test()
+{
+    constexpr T numerator {0};
+
+    using dist_type = std::conditional_t<std::numeric_limits<T>::is_signed, std::int64_t, std::uint64_t>;
+    std::uniform_int_distribution<dist_type> dist {std::numeric_limits<dist_type>::min(), std::numeric_limits<dist_type>::max()};
+
+    for (std::size_t i {0}; i < N; ++i)
+    {
+        const auto value {dist(gen)};
+        BOOST_TEST_EQ(numerator / value, numerator);
+    }
+}
+
+int main()
+{
+    test<boost::int128::int128_t>();
+    test<boost::int128::uint128_t>();
+
+    return boost::report_errors();
+}