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diff --git a/gmp/tests/mpz/t-scan.c b/gmp/tests/mpz/t-scan.c
new file mode 100644
index 00000000..6598ed96
--- /dev/null
+++ b/gmp/tests/mpz/t-scan.c
@@ -0,0 +1,132 @@
+/* Tests of mpz_scan0 and mpz_scan1.
+
+Copyright 2000, 2001, 2002, 2003 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 <stdio.h>
+#include <stdlib.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+unsigned long
+refmpz_scan (mpz_srcptr z, unsigned long i, int sought)
+{
+  unsigned long  z_bits = (unsigned long) ABSIZ(z) * GMP_NUMB_BITS;
+
+  do
+    {
+      if (mpz_tstbit (z, i) == sought)
+        return i;
+      i++;
+    }
+  while (i <= z_bits);
+
+  return ULONG_MAX;
+}
+
+unsigned long
+refmpz_scan0 (mpz_srcptr z, unsigned long starting_bit)
+{
+  return refmpz_scan (z, starting_bit, 0);
+}
+
+unsigned long
+refmpz_scan1 (mpz_srcptr z, unsigned long starting_bit)
+{
+  return refmpz_scan (z, starting_bit, 1);
+}
+
+
+void
+check_ref (void)
+{
+  static const int offset[] = {
+    -2, -1, 0, 1, 2, 3
+  };
+
+  mpz_t          z;
+  int            test, neg, sought, oindex, o;
+  mp_size_t      size, isize;
+  unsigned long  start, got, want;
+
+  mpz_init (z);
+  for (test = 0; test < 5; test++)
+    {
+      for (size = 0; size < 5; size++)
+        {
+          mpz_random2 (z, size);
+
+          for (neg = 0; neg <= 1; neg++)
+            {
+              if (neg)
+                mpz_neg (z, z);
+
+              for (isize = 0; isize <= size; isize++)
+                {
+                  for (oindex = 0; oindex <= numberof (offset); oindex++)
+                    {
+                      o = offset[oindex];
+                      if ((int) isize*GMP_NUMB_BITS < -o)
+                        continue;  /* start would be negative */
+
+                      start = isize*GMP_NUMB_BITS + o;
+
+                      for (sought = 0; sought <= 1; sought++)
+                        {
+                          if (sought == 0)
+                            {
+                              got = mpz_scan0 (z, start);
+                              want = refmpz_scan0 (z, start);
+                            }
+                          else
+                            {
+                              got = mpz_scan1 (z, start);
+                              want = refmpz_scan1 (z, start);
+                            }
+
+                          if (got != want)
+                            {
+                              printf ("wrong at test=%d, size=%ld, neg=%d, start=%lu, sought=%d\n",
+                                      test, size, neg, start, sought);
+                              printf ("   z 0x");
+                              mpz_out_str (stdout, -16, z);
+                              printf ("\n");
+                              printf ("   got=%lu, want=%lu\n", got, want);
+                              exit (1);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+  mpz_clear (z);
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  tests_start ();
+
+  check_ref ();
+
+  tests_end ();
+  exit (0);
+}