Add test that prints command line help menu.

Author: gamemann

Makefile

@@ -61,6 +61,7 @@ config: mk_build
 
 custom_tests:
 	$(CC) -O2 -g -I src/ $(shell $(PKG_CONF) --libs json-c) $(BUILD_DIR)/$(CMD_LINE_OUT) $(BUILD_DIR)/$(CONFIG_OUT) -o $(BUILD_DIR)/test_cfg_print $(TESTS_DIR)/cfg_print.c
+	$(CC) -O2 -g -I src/ $(shell $(PKG_CONF) --libs json-c) $(BUILD_DIR)/$(CMD_LINE_OUT) $(BUILD_DIR)/$(CONFIG_OUT) -o $(BUILD_DIR)/test_cmd_help $(TESTS_DIR)/cmd_help.c
 
 # Install (copy base config file if it doesn't already exist).
 install:

tests/cmd_help.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <linux/types.h>
+#include <getopt.h>
+#include <errno.h>
+
+#include <cmd_line.h>
+
+int main(int argc, char *argv[])
+{
+    print_cmd_help();
+
+    return EXIT_SUCCESS;
+}