diff -r 5ad29b5bf1c7 -r 225762d4e206 protocols/ircv3/tests/test_ircv3_source.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/protocols/ircv3/tests/test_ircv3_source.c	Mon Mar 25 21:43:28 2024 -0500
@@ -0,0 +1,158 @@
+/*
+ * Purple - Internet Messaging Library
+ * Copyright (C) Pidgin Developers <devel@pidgin.im>
+ *
+ * This 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 2 of the License, or (at your option) any later version.
+ *
+ * This 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 this library; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+
+#include <purple.h>
+
+#include "../purpleircv3source.h"
+
+/******************************************************************************
+ * Tests
+ *****************************************************************************/
+static void
+test_ircv3_source_parse_return_address_required(void) {
+	if(g_test_subprocess()) {
+		purple_ircv3_source_parse("pidgy", NULL, NULL, NULL);
+	}
+
+	g_test_trap_subprocess(NULL, 0, G_TEST_SUBPROCESS_DEFAULT);
+	g_test_trap_assert_stderr("*nick != NULL || user != NULL || host != NULL' failed*");
+}
+
+static void
+test_ircv3_source_parse_nick(void) {
+	char *nick = NULL;
+	char *user = NULL;
+	char *host = NULL;
+
+	/* Once to make sure that user and host are null. */
+	purple_ircv3_source_parse("pidgy", &nick, &user, &host);
+	g_assert_cmpstr(nick, ==, "pidgy");
+	g_clear_pointer(&nick, g_free);
+
+	g_assert_null(user);
+	g_assert_null(host);
+
+	/* Again to make sure it works without user and host. */
+	purple_ircv3_source_parse("pidgy", &nick, NULL, NULL);
+	g_assert_cmpstr(nick, ==, "pidgy");
+	g_clear_pointer(&nick, g_free);
+}
+
+static void
+test_ircv3_source_parse_user(void) {
+	char *nick = NULL;
+	char *user = NULL;
+	char *host = NULL;
+
+	/* Once to make sure host is null. */
+	purple_ircv3_source_parse("pidgy!~u", &nick, &user, &host);
+	g_assert_cmpstr(nick, ==, "pidgy");
+	g_clear_pointer(&nick, g_free);
+
+	g_assert_cmpstr(user, ==, "~u");
+	g_clear_pointer(&user, g_free);
+
+	g_assert_null(host);
+
+	/* Again to make sure nick and host aren't required. */
+	purple_ircv3_source_parse("pidgy!~u", NULL, &user, NULL);
+	g_assert_cmpstr(user, ==, "~u");
+	g_clear_pointer(&user, g_free);
+}
+
+static void
+test_ircv3_source_parse_host(void) {
+	char *nick = NULL;
+	char *user = NULL;
+	char *host = NULL;
+
+	/* Once to make sure everything works. */
+	purple_ircv3_source_parse("pidgy!~u@53unc8n42i868.irc", &nick, &user,
+	                          &host);
+	g_assert_cmpstr(nick, ==, "pidgy");
+	g_clear_pointer(&nick, g_free);
+
+	g_assert_cmpstr(user, ==, "~u");
+	g_clear_pointer(&user, g_free);
+
+	g_assert_cmpstr(host, ==, "53unc8n42i868.irc");
+	g_clear_pointer(&host, g_free);
+
+	/* Again to make sure nick and host aren't required. */
+	purple_ircv3_source_parse("pidgy!~u@53unc8n42i868.irc", NULL, NULL, &host);
+	g_assert_cmpstr(host, ==, "53unc8n42i868.irc");
+	g_clear_pointer(&host, g_free);
+}
+
+static void
+test_ircv3_source_parse_baddies(void) {
+	char *nick = NULL;
+	char *user = NULL;
+	char *server = NULL;
+
+	purple_ircv3_source_parse("\n", &nick, NULL, NULL);
+	g_assert_null(nick);
+
+	purple_ircv3_source_parse("a\nb", &nick, NULL, NULL);
+	g_assert_null(nick);
+
+	purple_ircv3_source_parse("\r", &nick, NULL, NULL);
+	g_assert_null(nick);
+
+	purple_ircv3_source_parse("c\rd", &nick, NULL, NULL);
+	g_assert_null(nick);
+
+	purple_ircv3_source_parse(" ", &nick, NULL, NULL);
+	g_assert_null(nick);
+
+	purple_ircv3_source_parse("e f", &nick, NULL, NULL);
+	g_assert_null(nick);
+
+	purple_ircv3_source_parse("nick@foo!user@server", &nick, &user, &server);
+	g_assert_cmpstr(nick, ==, "nick@foo");
+	g_clear_pointer(&nick, g_free);
+	g_assert_cmpstr(user, ==, "user");
+	g_clear_pointer(&user, g_free);
+	g_assert_cmpstr(server, ==, "server");
+	g_clear_pointer(&server, g_free);
+
+	purple_ircv3_source_parse("nick!user@server!foo", &nick, &user, &server);
+	g_assert_cmpstr(nick, ==, "nick!user@server!foo");
+	g_assert_null(user);
+	g_assert_null(server);
+}
+
+/******************************************************************************
+ * Main
+ *****************************************************************************/
+int
+main(int argc, char *argv[]) {
+	g_test_init(&argc, &argv, NULL);
+
+	g_test_add_func("/ircv3/source/parse/return-address-required",
+	                test_ircv3_source_parse_return_address_required);
+	g_test_add_func("/ircv3/source/parse/nick", test_ircv3_source_parse_nick);
+	g_test_add_func("/ircv3/source/parse/user", test_ircv3_source_parse_user);
+	g_test_add_func("/ircv3/source/parse/host", test_ircv3_source_parse_host);
+	g_test_add_func("/ircv3/source/parse/baddies",
+	                test_ircv3_source_parse_baddies);
+
+	return g_test_run();
+}
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