ceil, floor, round, trunc: enhance tests of -0

[gnulib.git] / tests / test-round1.c

diff --git a/tests/test-round1.c b/tests/test-round1.c
index 86fd1de..4711a74 100644 (file)
--- a/tests/test-round1.c
+++ b/tests/test-round1.c
@@ -35,7 +35,9 @@ main ()
 {
   /* Zero.  */
   ASSERT (round (0.0) == 0.0);
+  ASSERT (!signbit (round (0.0)));
   ASSERT (round (minus_zerod) == 0.0);
+  ASSERT (!!signbit (minus_zerod) == !!signbit (round (minus_zerod)));
   /* Positive numbers.  */
   ASSERT (round (0.3) == 0.0);
   ASSERT (round (0.5) == 1.0);