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diff --git a/tests/libknot/test_rdata.c b/tests/libknot/test_rdata.c
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+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdbool.h>
+#include <tap/basic.h>
+
+#include "libknot/rdata.h"
+
+int main(int argc, char *argv[])
+{
+ plan_lazy();
+
+ // Test array size
+ ok(knot_rdata_size(1) == 2 + 1 + 1, "rdata: array size odd.");
+ ok(knot_rdata_size(2) == 2 + 2, "rdata: array size even.");
+
+ // Test init
+ const size_t data_size = 16;
+ uint8_t buf1[knot_rdata_size(data_size)];
+ knot_rdata_t *rdata = (knot_rdata_t *)buf1;
+ uint8_t payload[] = "abcdefghijklmnop";
+ knot_rdata_init(rdata, data_size, payload);
+ const bool set_ok = rdata->len == data_size &&
+ memcmp(rdata->data, payload, data_size) == 0;
+ ok(set_ok, "rdata: init.");
+
+ // Test compare
+ rdata->len = data_size;
+ ok(knot_rdata_cmp(rdata, rdata) == 0, "rdata: cmp eq.");
+
+ knot_rdata_t *lower = rdata;
+ uint8_t buf2[knot_rdata_size(data_size)];
+ knot_rdata_t *greater = (knot_rdata_t *)buf2;
+ knot_rdata_init(greater, data_size, (uint8_t *)"qrstuvwxyz123456");
+ ok(knot_rdata_cmp(lower, greater) < 0, "rdata: cmp lower.");
+ ok(knot_rdata_cmp(greater, lower) > 0, "rdata: cmp greater.");
+
+ // Payloads will be the same.
+ memcpy(greater->data, lower->data, data_size);
+ assert(knot_rdata_cmp(lower, greater) == 0);
+
+ lower->len = data_size - 1;
+ ok(knot_rdata_cmp(lower, greater) < 0, "rdata: cmp lower size.");
+ ok(knot_rdata_cmp(greater, lower) > 0, "rdata: cmp greater size.");
+
+ return 0;
+}