--- /dev/null
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+
+#include <util.h>
+
+#include "dhcp-protocol.h"
+#include "dhcp-internal.h"
+
+static void test_invalid_buffer_length(void)
+{
+ DHCPMessage message;
+
+ assert(dhcp_option_parse(&message, 0, NULL, NULL) == -EINVAL);
+ assert(dhcp_option_parse(&message, sizeof(DHCPMessage), NULL, NULL)
+ == -EINVAL);
+}
+
+static void test_cookie(void)
+{
+ DHCPMessage *message;
+ size_t len = sizeof(DHCPMessage) + 4;
+ uint8_t *opt;
+
+ message = malloc0(len);
+
+ opt = (uint8_t *)(message + 1);
+ opt[0] = 0xff;
+
+ assert(dhcp_option_parse(message, len, NULL, NULL) == -EINVAL);
+
+ opt[0] = 99;
+ opt[1] = 130;
+ opt[2] = 83;
+ opt[3] = 99;
+
+ assert(dhcp_option_parse(message, len, NULL, NULL) == -ENOMSG);
+
+ free(message);
+}
+
+int main(int argc, char *argv[])
+{
+ test_invalid_buffer_length();
+ test_cookie();
+
+ return 0;
+}