From 7048e7ccc92bdcb158843b33a2f52f126f2ad14e Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Fri, 17 May 2024 19:31:56 +0100
Subject: [PATCH] Correct decimal test case.

---
 test/test_next_decimal.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/test/test_next_decimal.cpp b/test/test_next_decimal.cpp
index 07d59aa87..6827a9339 100644
--- a/test/test_next_decimal.cpp
+++ b/test/test_next_decimal.cpp
@@ -176,12 +176,12 @@ void test_values(const T& val, const char* name)
       BOOST_CHECK_EQUAL(boost::math::float_advance(val, primes[i]), v1);
       BOOST_CHECK_EQUAL(boost::math::float_advance(val, -primes[i]), v2);
    }
-   if(std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_infinity))
+   BOOST_IF_CONSTEXPR(std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_infinity))
    {
       BOOST_CHECK_EQUAL(boost::math::float_prior(std::numeric_limits<T>::infinity()), (std::numeric_limits<T>::max)());
       BOOST_CHECK_EQUAL(boost::math::float_next(-std::numeric_limits<T>::infinity()), -(std::numeric_limits<T>::max)());
-      BOOST_MATH_CHECK_THROW(boost::math::float_prior(-std::numeric_limits<T>::infinity()), std::domain_error);
-      BOOST_MATH_CHECK_THROW(boost::math::float_next(std::numeric_limits<T>::infinity()), std::domain_error);
+      BOOST_CHECK_EQUAL(boost::math::float_prior(-std::numeric_limits<T>::infinity()), -std::numeric_limits<T>::infinity());
+      BOOST_CHECK_EQUAL(boost::math::float_next(std::numeric_limits<T>::infinity()), std::numeric_limits<T>::infinity());
       if(boost::math::policies:: BOOST_MATH_OVERFLOW_ERROR_POLICY == boost::math::policies::throw_on_error)
       {
          BOOST_MATH_CHECK_THROW(boost::math::float_prior(-(std::numeric_limits<T>::max)()), std::overflow_error);
@@ -193,6 +193,11 @@ void test_values(const T& val, const char* name)
          BOOST_CHECK_EQUAL(boost::math::float_next((std::numeric_limits<T>::max)()), std::numeric_limits<T>::infinity());
       }
    }
+   BOOST_IF_CONSTEXPR(std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_quiet_NaN))
+   {
+      BOOST_MATH_CHECK_THROW(boost::math::float_prior(std::numeric_limits<T>::quiet_NaN()), std::domain_error);
+      BOOST_MATH_CHECK_THROW(boost::math::float_next(std::numeric_limits<T>::quiet_NaN()), std::domain_error);
+   }
 }
 
 BOOST_AUTO_TEST_CASE( test_main )