--- /dev/null
+/* Test of libgmp or its mini-mpq substitute.
+ Copyright (C) 2024 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <gmp.h>
+
+#include <limits.h>
+#include <string.h>
+
+#include "macros.h"
+
+int
+main ()
+{
+ /* A simple sanity check that 2/3 + 2/3 = 4/3. */
+ static mp_limb_t const twobody[] = { 2 };
+ static mp_limb_t const threebody[] = { 3 };
+ static mpz_t const two = MPZ_ROINIT_N ((mp_limb_t *) twobody, 1);
+ static mpz_t const three = MPZ_ROINIT_N ((mp_limb_t *) threebody, 1);
+ ASSERT (mpz_fits_slong_p (two));
+ ASSERT (mpz_get_si (two) == 2);
+ ASSERT (mpz_fits_slong_p (three));
+ ASSERT (mpz_get_si (three) == 3);
+
+ mpq_t q;
+ mpq_init (q);
+ mpz_set (mpq_numref (q), two);
+ mpz_set (mpq_denref (q), three);
+ mpq_add (q, q, q);
+ ASSERT (mpz_fits_slong_p (mpq_numref (q)));
+ ASSERT (mpz_get_si (mpq_numref (q)) == 4);
+ ASSERT (mpz_fits_slong_p (mpq_denref (q)));
+ ASSERT (mpz_get_si (mpq_denref (q)) == 3);
+ mpq_clear (q);
+
+ return test_exit_status;
+}