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diff --git a/mpfr/tests/tcopysign.c b/mpfr/tests/tcopysign.c
new file mode 100644
index 00000000..55185d1f
--- /dev/null
+++ b/mpfr/tests/tcopysign.c
@@ -0,0 +1,116 @@
+/* Test file for mpfr_copysign, mpfr_setsign and mpfr_signbit.
+
+Copyright 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MPFR Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpfr-test.h"
+
+static void
+copysign_variant (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y,
+                  mp_rnd_t rnd_mode, int k)
+{
+  mpfr_clear_flags ();
+  switch (k)
+    {
+    case 0:
+      mpfr_copysign (z, x, y, GMP_RNDN);
+      return;
+    case 1:
+      (mpfr_copysign) (z, x, y, GMP_RNDN);
+      return;
+    case 2:
+      mpfr_setsign (z, x, mpfr_signbit (y), GMP_RNDN);
+      return;
+    case 3:
+      mpfr_setsign (z, x, (mpfr_signbit) (y), GMP_RNDN);
+      return;
+    case 4:
+      (mpfr_setsign) (z, x, mpfr_signbit (y), GMP_RNDN);
+      return;
+    case 5:
+      (mpfr_setsign) (z, x, (mpfr_signbit) (y), GMP_RNDN);
+      return;
+    }
+}
+
+int
+main (void)
+{
+  mpfr_t x, y, z;
+  int i, j, k;
+
+  tests_start_mpfr ();
+
+  mpfr_init (x);
+  mpfr_init (y);
+  mpfr_init (z);
+
+  for (i = 0; i <= 1; i++)
+    for (j = 0; j <= 1; j++)
+      for (k = 0; k <= 5; k++)
+        {
+          mpfr_set_nan (x);
+          i ? MPFR_SET_NEG (x) : MPFR_SET_POS (x);
+          mpfr_set_nan (y);
+          j ? MPFR_SET_NEG (y) : MPFR_SET_POS (y);
+          copysign_variant (z, x, y, GMP_RNDN, k);
+          if (MPFR_SIGN (z) != MPFR_SIGN (y) || !mpfr_nanflag_p ())
+            {
+              printf ("Error in mpfr_copysign (%cNaN, %cNaN)\n",
+                      i ? '-' : '+', j ? '-' : '+');
+              exit (1);
+            }
+
+          mpfr_set_si (x, i ? -1250 : 1250, GMP_RNDN);
+          mpfr_set_nan (y);
+          j ? MPFR_SET_NEG (y) : MPFR_SET_POS (y);
+          copysign_variant (z, x, y, GMP_RNDN, k);
+          if (i != j)
+            mpfr_neg (x, x, GMP_RNDN);
+          if (! mpfr_equal_p (z, x) || mpfr_nanflag_p ())
+            {
+              printf ("Error in mpfr_copysign (%c1250, %cNaN)\n",
+                      i ? '-' : '+', j ? '-' : '+');
+              exit (1);
+            }
+
+          mpfr_set_si (x, i ? -1250 : 1250, GMP_RNDN);
+          mpfr_set_si (y, j ? -1717 : 1717, GMP_RNDN);
+          copysign_variant (z, x, y, GMP_RNDN, k);
+          if (i != j)
+            mpfr_neg (x, x, GMP_RNDN);
+          if (! mpfr_equal_p (z, x) || mpfr_nanflag_p ())
+            {
+              printf ("Error in mpfr_copysign (%c1250, %c1717)\n",
+                      i ? '-' : '+', j ? '-' : '+');
+              exit (1);
+            }
+        }
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+  mpfr_clear (z);
+
+  tests_end_mpfr ();
+  return 0;
+}