Remove ignores and add test

.gitignore

@@ -1,3 +0,0 @@
-build/
-.clangd/
-compile_commands.json

CMakeLists.txt

@@ -99,6 +99,7 @@ if (BUILD_TESTS)
 	add_test(NAME "OptCRLF" COMMAND "optcrlf")
 	add_test(NAME "Allocators" COMMAND "allocs")
 	add_test(NAME "ManualAssemblers" COMMAND "manassm")
+	add_test(NAME "ErrorNumbers" COMMAND "errno")
 endif()
 
 add_library(uirc ${UIRC_SOURCE})

tests/CMakeLists.txt

@@ -16,3 +16,6 @@ target_link_libraries(manassm uirc)
 
 add_executable(allocs allocs.c common.c)
 target_link_libraries(allocs uirc)
+
+add_executable(errno errno.c common.c)
+target_link_libraries(errno uirc)

tests/errno.c

@@ -0,0 +1,35 @@
+/*
+ *  This file is part of uIRC. (https://git.redxen.eu/caskd/uIRC)
+ *  Copyright (c) 2019-2021 Alex-David Denes
+ *
+ *  uIRC 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
+ *  any later version.
+ *
+ *  uIRC 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 uIRC.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "common.h" // expect() print_irc_message()
+#include "uirc.h"   // uirc_* IRC_*
+
+#include <stdbool.h> // true
+#include <stdio.h>   // fprintf()
+#include <stdlib.h>  // EXIT_*
+#include <string.h>  // strcmp()
+
+int
+main(void)
+{
+	if (uirc_errno != UIRC_ERR_NERROR) return EXIT_FAILURE;
+	const char* const str = "???? THIS IS INVALID";
+	IRC_Message*      m   = uirc_tokenizer_message(str);
+	if (m != NULL || uirc_errno != UIRC_ERR_INVFMT) return EXIT_FAILURE;
+	return EXIT_SUCCESS;
+}