From e6f97e0c24040814ca3eec82822251d049e85d1c Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Wed, 25 Oct 2023 10:27:59 -0700
Subject: [PATCH] Add test of negative NaN

---
 tests/d2s_test.rs | 3 ++-
 tests/f2s_test.rs | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/d2s_test.rs b/tests/d2s_test.rs
index 368cab6..7e8eba6 100644
--- a/tests/d2s_test.rs
+++ b/tests/d2s_test.rs
@@ -82,7 +82,8 @@ fn test_basic() {
     check!(-0.0);
     check!(1.0);
     check!(-1.0);
-    assert_eq!(pretty(f64::NAN), "NaN");
+    assert_eq!(pretty(f64::NAN.copysign(1.0)), "NaN");
+    assert_eq!(pretty(f64::NAN.copysign(-1.0)), "NaN");
     assert_eq!(pretty(f64::INFINITY), "inf");
     assert_eq!(pretty(f64::NEG_INFINITY), "-inf");
 }
diff --git a/tests/f2s_test.rs b/tests/f2s_test.rs
index 927fa7e..d6249a3 100644
--- a/tests/f2s_test.rs
+++ b/tests/f2s_test.rs
@@ -75,7 +75,8 @@ fn test_basic() {
     check!(-0.0);
     check!(1.0);
     check!(-1.0);
-    assert_eq!(pretty(f32::NAN), "NaN");
+    assert_eq!(pretty(f32::NAN.copysign(1.0)), "NaN");
+    assert_eq!(pretty(f32::NAN.copysign(-1.0)), "NaN");
     assert_eq!(pretty(f32::INFINITY), "inf");
     assert_eq!(pretty(f32::NEG_INFINITY), "-inf");
 }