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diff --git a/mpfr/tests/tadd_ui.c b/mpfr/tests/tadd_ui.c
new file mode 100644
index 00000000..fc1d8829
--- /dev/null
+++ b/mpfr/tests/tadd_ui.c
@@ -0,0 +1,116 @@
+/* Test file for mpfr_add_ui
+
+Copyright 2000, 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 <stdio.h>
+#include <stdlib.h>
+#include <float.h>
+
+#include "mpfr-test.h"
+
+/* checks that x+y gives the right results with 53 bits of precision */
+static void
+check3 (const char *xs, unsigned long y, mp_rnd_t rnd_mode, const char *zs)
+{
+  mpfr_t xx, zz;
+
+  mpfr_inits2 (53, xx, zz, (mpfr_ptr) 0);
+  mpfr_set_str1 (xx, xs);
+  mpfr_add_ui (zz, xx, y, rnd_mode);
+  if (mpfr_cmp_str1(zz, zs) )
+    {
+      printf ("expected sum is %s, got ",zs);
+      mpfr_out_str(stdout, 10, 0, zz, GMP_RNDN);
+      printf ("\nmpfr_add_ui failed for x=%s y=%lu with rnd_mode=%s\n",
+              xs, y, mpfr_print_rnd_mode(rnd_mode));
+      exit (1);
+  }
+  mpfr_clears (xx, zz, (mpfr_ptr) 0);
+}
+
+static void
+special (void)
+{
+  mpfr_t x, y;
+
+  mpfr_init2 (x, 63);
+  mpfr_init2 (y, 63);
+  mpfr_set_str_binary (x, "0.110100000000000001110001110010111111000000000101100011100100011");
+  mpfr_add_ui (y, x, 1, GMP_RNDD);
+  mpfr_clear (x);
+  mpfr_clear (y);
+}
+
+static void
+check_nans (void)
+{
+  mpfr_t  x, y;
+
+  mpfr_init2 (x, 123L);
+  mpfr_init2 (y, 123L);
+
+  /* nan + 2394875 == nan */
+  mpfr_set_nan (x);
+  mpfr_add_ui (y, x, 2394875L, GMP_RNDN);
+  MPFR_ASSERTN (mpfr_nan_p (y));
+
+  /* +inf + 2394875 == +inf */
+  mpfr_set_inf (x, 1);
+  mpfr_add_ui (y, x, 2394875L, GMP_RNDN);
+  MPFR_ASSERTN (mpfr_inf_p (y));
+  MPFR_ASSERTN (mpfr_sgn (y) > 0);
+
+  /* -inf + 2394875 == -inf */
+  mpfr_set_inf (x, -1);
+  mpfr_add_ui (y, x, 2394875L, GMP_RNDN);
+  MPFR_ASSERTN (mpfr_inf_p (y));
+  MPFR_ASSERTN (mpfr_sgn (y) < 0);
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+}
+
+#define TEST_FUNCTION mpfr_add_ui
+#define INTEGER_TYPE  unsigned long
+#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1)
+#include "tgeneric_ui.c"
+
+int
+main (int argc, char *argv[])
+{
+  tests_start_mpfr ();
+
+  check_nans ();
+
+  special ();
+  check3 ("-1.716113812768534e-140", 1271212614, GMP_RNDZ,
+          "1.27121261399999976e9");
+  check3 ("1.22191250737771397120e+20", 948002822, GMP_RNDN,
+          "122191250738719408128.0");
+  check3 ("-6.72658901114033715233e-165", 2000878121, GMP_RNDZ,
+          "2.0008781209999997615e9");
+  check3 ("-2.0769715792901673e-5", 880524, GMP_RNDN,
+          "8.8052399997923023e5");
+  test_generic_ui (2, 1000, 100);
+
+  tests_end_mpfr ();
+  return 0;
+}