Add temporary test set

Author: mborland

test/Jamfile

@@ -45,6 +45,7 @@ run-fail benchmarks.cpp ;
 compile-fail concepts_test.cpp ;
 run github_issue_426.cpp ;
 run github_issue_448.cpp ;
+run github_issue_519.cpp ;
 run ibm_abs.cpp ;
 run ibm_add.cpp ;
 run link_1.cpp link_2.cpp link_3.cpp ;

test/github_issue_519.cpp

@@ -0,0 +1,45 @@
+// Copyright 2024 Matt Borland
+// Copyright 2024 Christopher Kormanyos
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/decimal.hpp>
+
+#include <iomanip>
+#include <iostream>
+#include <limits>
+#include <sstream>
+
+auto main() -> int
+{
+    using local_decimal_type = boost::decimal::decimal128;
+
+    // N[Gamma[456/100], 34]
+    // 12.64819265438397922113369900828315
+    //
+    // For Decimal 128:
+    // 4.56
+    // 12.64819265438397922113369900828314
+
+    const local_decimal_type x = local_decimal_type { 456, -2 };
+
+    const auto tg = tgamma(x);
+
+    {
+        std::stringstream strm;
+
+        strm << std::setprecision(std::numeric_limits<local_decimal_type>::digits10) << x;
+
+        std::cout << strm.str() << std::endl;
+    }
+
+    {
+        std::stringstream strm;
+
+        strm << std::setprecision(std::numeric_limits<local_decimal_type>::digits10) << tg;
+
+        std::cout << strm.str() << std::endl;
+    }
+
+    return 1;
+}