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diff --git a/gmp/tests/mpq/t-aors.c b/gmp/tests/mpq/t-aors.c
new file mode 100644
index 00000000..df2dbe21
--- /dev/null
+++ b/gmp/tests/mpq/t-aors.c
@@ -0,0 +1,183 @@
+/* Test mpq_add and mpq_sub.
+
+Copyright 2001 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 3 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+void
+check_all (mpq_ptr x, mpq_ptr y, mpq_ptr want_add, mpq_ptr want_sub)
+{
+  mpq_t  got;
+  int    neg_x, neg_y, swap;
+
+  mpq_init (got);
+
+  MPQ_CHECK_FORMAT (want_add);
+  MPQ_CHECK_FORMAT (want_sub);
+  MPQ_CHECK_FORMAT (x);
+  MPQ_CHECK_FORMAT (y);
+
+  for (swap = 0; swap <= 1; swap++)
+    {
+      for (neg_x = 0; neg_x <= 1; neg_x++)
+        {
+          for (neg_y = 0; neg_y <= 1; neg_y++)
+            {
+              mpq_add (got, x, y);
+              MPQ_CHECK_FORMAT (got);
+              if (! mpq_equal (got, want_add))
+                {
+                  printf ("mpq_add wrong\n");
+                  mpq_trace ("  x   ", x);
+                  mpq_trace ("  y   ", y);
+                  mpq_trace ("  got ", got);
+                  mpq_trace ("  want", want_add);
+                  abort ();
+                }
+
+              mpq_sub (got, x, y);
+              MPQ_CHECK_FORMAT (got);
+              if (! mpq_equal (got, want_sub))
+                {
+                  printf ("mpq_sub wrong\n");
+                  mpq_trace ("  x   ", x);
+                  mpq_trace ("  y   ", y);
+                  mpq_trace ("  got ", got);
+                  mpq_trace ("  want", want_sub);
+                  abort ();
+                }
+
+
+              mpq_neg (y, y);
+              mpq_swap (want_add, want_sub);
+            }
+
+          mpq_neg (x, x);
+          mpq_swap (want_add, want_sub);
+          mpq_neg (want_add, want_add);
+          mpq_neg (want_sub, want_sub);
+        }
+
+      mpq_swap (x, y);
+      mpq_neg (want_sub, want_sub);
+    }
+
+  mpq_clear (got);
+}
+
+
+void
+check_data (void)
+{
+  static const struct {
+    const char  *x;
+    const char  *y;
+    const char  *want_add;
+    const char  *want_sub;
+
+  } data[] = {
+
+    { "0", "0", "0", "0" },
+    { "1", "0", "1", "1" },
+    { "1", "1", "2", "0" },
+
+    { "1/2", "1/2", "1", "0" },
+    { "5/6", "14/15", "53/30", "-1/10" },
+  };
+
+  mpq_t  x, y, want_add, want_sub;
+  int i;
+
+  mpq_init (x);
+  mpq_init (y);
+  mpq_init (want_add);
+  mpq_init (want_sub);
+
+  for (i = 0; i < numberof (data); i++)
+    {
+      mpq_set_str_or_abort (x, data[i].x, 0);
+      mpq_set_str_or_abort (y, data[i].y, 0);
+      mpq_set_str_or_abort (want_add, data[i].want_add, 0);
+      mpq_set_str_or_abort (want_sub, data[i].want_sub, 0);
+
+      check_all (x, y, want_add, want_sub);
+    }
+
+  mpq_clear (x);
+  mpq_clear (y);
+  mpq_clear (want_add);
+  mpq_clear (want_sub);
+}
+
+
+void
+check_rand (void)
+{
+  mpq_t  x, y, want_add, want_sub;
+  int i;
+  gmp_randstate_ptr  rands = RANDS;
+
+  mpq_init (x);
+  mpq_init (y);
+  mpq_init (want_add);
+  mpq_init (want_sub);
+
+  for (i = 0; i < 500; i++)
+    {
+      mpz_errandomb (mpq_numref(x), rands, 512L);
+      mpz_errandomb_nonzero (mpq_denref(x), rands, 512L);
+      mpq_canonicalize (x);
+
+      mpz_errandomb (mpq_numref(y), rands, 512L);
+      mpz_errandomb_nonzero (mpq_denref(y), rands, 512L);
+      mpq_canonicalize (y);
+
+      refmpq_add (want_add, x, y);
+      refmpq_sub (want_sub, x, y);
+
+      check_all (x, y, want_add, want_sub);
+    }
+
+  mpq_clear (x);
+  mpq_clear (y);
+  mpq_clear (want_add);
+  mpq_clear (want_sub);
+}
+
+
+int
+main (void)
+{
+  tests_start ();
+
+  check_data ();
+  check_rand ();
+
+  tests_end ();
+
+  exit (0);
+}