add new single state test

tests/07-single-state.cpp

@@ -0,0 +1,41 @@
+/* -----------------------------------------------------------------------------
+ * The Cyberiada GraphML C++ library implemention
+ *
+ * The test
+ *
+ * Copyright (C) 2024 Alexey Fedoseev <aleksey@fedoseev.net>
+ *
+ * This program 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
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see https://www.gnu.org/licenses/
+ * ----------------------------------------------------------------------------- */
+
+#include <iostream>
+#include "cyberiadamlpp.h"
+#include "testutils.h"
+
+using namespace Cyberiada;
+using namespace std;
+
+int main(int argc, char** argv)
+{
+	Document d;
+	StateMachine* sm = d.new_state_machine("SM");
+	d.new_state(sm, "First state");
+	try {
+		cout << d << endl;
+		d.save(string(argv[0]) + ".graphml", formatCyberiada10);
+	} catch (const Cyberiada::Exception&) {
+		return 1;
+	}
+	return 0;
+}