Tests lowercasing argument on cmd_connect

tests/test_cmd_connect.h

@@ -5,3 +5,4 @@ void cmd_connect_shows_message_when_undefined(void **state);
 void cmd_connect_when_no_account(void **state);
 void cmd_connect_with_altdomain_when_provided(void **state);
 void cmd_connect_fail_message(void **state);
+void cmd_connect_lowercases_argument(void **state);