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diff --git a/mpfr/tests/tout_str.c b/mpfr/tests/tout_str.c
new file mode 100644
index 00000000..5c587fa9
--- /dev/null
+++ b/mpfr/tests/tout_str.c
@@ -0,0 +1,141 @@
+/* Test file for mpfr_out_str.
+
+Copyright 1999, 2001, 2002, 2003, 2004, 2005, 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 <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mpfr-test.h"
+
+FILE *fout;
+
+#define check(d,r,b) check4(d,r,b,53)
+
+static void
+check4 (double d, mp_rnd_t rnd, int base, int prec)
+{
+  mpfr_t x;
+
+  mpfr_init2 (x, prec);
+  mpfr_set_d (x, d, rnd);
+  fprintf (fout, "%1.19e base %d rnd %d:\n ", d, base, rnd);
+  mpfr_out_str (fout, base, (base == 2) ? prec : 0, x, rnd);
+  fputc ('\n', fout);
+  mpfr_clear (x);
+}
+
+static void
+special (void)
+{
+  mpfr_t x;
+
+  mpfr_init (x);
+
+  mpfr_set_nan (x);
+  mpfr_out_str (fout, 10, 0, x, GMP_RNDN);
+
+  mpfr_set_inf (x, 1);
+  mpfr_out_str (fout, 10, 0, x, GMP_RNDN);
+
+  mpfr_set_inf (x, -1);
+  mpfr_out_str (fout, 10, 0, x, GMP_RNDN);
+
+  mpfr_set_ui (x, 0, GMP_RNDN);
+  mpfr_out_str (fout, 10, 0, x, GMP_RNDN);
+  mpfr_neg (x, x, GMP_RNDN);
+  mpfr_out_str (fout, 10, 0, x, GMP_RNDN);
+
+  mpfr_clear (x);
+}
+
+int
+main (int argc, char *argv[])
+{
+  int i, N=10000, p;
+  mp_rnd_t rnd;
+  double d;
+
+  tests_start_mpfr ();
+
+  /* with no argument: prints to /dev/null,
+     tout_str N: prints N tests to stdout */
+  if (argc == 1)
+    {
+      fout = fopen ("/dev/null", "w");
+      /* If we failed to open this device, try with a dummy file */
+      if (fout == NULL)
+        fout = fopen ("mpfrtest.txt", "w");
+    }
+  else
+    {
+      fout = stdout;
+      N = atoi (argv[1]);
+    }
+
+  if (fout == NULL)
+    {
+      printf ("Can't open /dev/null or stdout\n");
+      exit (1);
+    }
+
+  special ();
+
+  check (-1.37247529013405550000e+15, GMP_RNDN, 7);
+  check (-1.5674376729569697500e+15, GMP_RNDN, 19);
+  check (-5.71262771772792640000e-79, GMP_RNDU, 16);
+  check (DBL_NEG_ZERO, GMP_RNDU, 7);
+  check (-4.5306392613572974756e-308, GMP_RNDN, 8);
+  check (-6.7265890111403371523e-165, GMP_RNDN, 4);
+  check (-1.3242553591261807653e+156, GMP_RNDN, 16);
+  check (-6.606499965302424244461355e233, GMP_RNDN, 10);
+  check4 (1.0, GMP_RNDN, 10, 120);
+  check (1.0, GMP_RNDU, 10);
+  check (4.059650008e-83, GMP_RNDN, 10);
+  check (-7.4, GMP_RNDN, 10);
+  check (0.997, GMP_RNDN, 10);
+  check (-4.53063926135729747564e-308, GMP_RNDN, 10);
+  check (2.14478198760196000000e+16, GMP_RNDN, 10);
+  check (7.02293374921793516813e-84, GMP_RNDN, 10);
+
+  /* random tests */
+  for (i=0;i<N;i++)
+    {
+      do
+        {
+          d = DBL_RAND ();
+        }
+#ifdef HAVE_DENORMS
+      while (0);
+#else
+      while (ABS(d) < DBL_MIN);
+#endif
+      rnd = RND_RAND ();
+      p = 2 + randlimb () % 35;
+      check (d, rnd, p);
+    }
+
+  fclose (fout);
+
+  tests_end_mpfr ();
+  return 0;
+}