Create a /server API for register servers

This allow to push to the controller information about
the connection to a server.

tests/controller/test_controller.py

@@ -18,19 +18,23 @@
 import pytest
 
 from gns3server.controller import Controller
+from gns3server.controller.server import Server
 from gns3server.config import Config
 
 
-@pytest.fixture
-def controller():
-    Controller._instance = None
-    return Controller.instance()
-
-
-
 def test_isEnabled(controller):
     Config.instance().set("Server", "controller", False)
     assert not controller.isEnabled()
     Config.instance().set("Server", "controller", True)
     assert controller.isEnabled()
 
+
+def test_addServer(controller):
+    server1 = Server("test1")
+
+    controller.addServer(server1)
+    assert len(controller.servers) == 1
+    controller.addServer(Server("test1"))
+    assert len(controller.servers) == 1
+    controller.addServer(Server("test2"))
+    assert len(controller.servers) == 2

tests/controller/test_server.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2016 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 pytest
+
+from gns3server.controller.server import Server
+
+
+@pytest.fixture
+def server():
+    return Server("my_server_id", protocol="https", host="example.com", port=84, user="test", password="secure")
+
+
+def test_init(server):
+    assert server.id == "my_server_id"
+
+
+def test_json(server):
+    assert server.__json__() == {
+        "server_id": "my_server_id",
+        "protocol": "https",
+        "host": "example.com",
+        "port": 84,
+        "user": "test",
+        "connected": False,
+        "version": None
+    }
+
+
+def test__eq__(server):
+    assert server != 1
+    assert server == server
+    assert server == Server("my_server_id")
+    assert server != Server("test")