Raise exception if we try to reserve an already reserve port

tests/modules/test_port_manager.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2015 GNS3 Technologies Inc.
+#
+# 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 <http://www.gnu.org/licenses/>.
+
+import aiohttp
+import pytest
+from gns3server.modules.port_manager import PortManager
+
+
+def test_reserve_console_port():
+    pm = PortManager.instance()
+    pm.reserve_console_port(4242)
+    with pytest.raises(aiohttp.web.HTTPConflict):
+        pm.reserve_console_port(4242)