diff --git a/tests/test_main.py b/tests/test_main.py
new file mode 100644
index 0000000..0dedbbd
--- /dev/null
+++ b/tests/test_main.py
@@ -0,0 +1,45 @@
+import unittest
+
+from tornado.web import Application
+from webssh.handler import open_to_public
+from webssh.main import app_listen
+
+
+class TestMain(unittest.TestCase):
+
+    def test_app_listen(self):
+        app = Application()
+        app.listen = lambda x, y, **kwargs: 1
+        open_to_public['https'] = None
+        open_to_public['http'] = None
+
+        server_settings = dict(ssl_options=False)
+        app_listen(app, 80, '127.0.0.1', server_settings)
+        self.assertEqual(open_to_public['http'], False)
+        self.assertIsNone(open_to_public['https'])
+        open_to_public['http'] = None
+
+        server_settings = dict(ssl_options=False)
+        app_listen(app, 80, '0.0.0.0', server_settings)
+        self.assertEqual(open_to_public['http'], True)
+        self.assertIsNone(open_to_public['https'])
+        open_to_public['http'] = None
+
+        server_settings = dict(ssl_options=True)
+        app_listen(app, 443, '127.0.0.1', server_settings)
+        self.assertEqual(open_to_public['https'], False)
+        self.assertIsNone(open_to_public['http'])
+        open_to_public['https'] = None
+
+        server_settings = dict(ssl_options=True)
+        app_listen(app, 443, '0.0.0.0', server_settings)
+        self.assertEqual(open_to_public['https'], True)
+        self.assertIsNone(open_to_public['http'])
+        open_to_public['https'] = None
+
+        server_settings = dict(ssl_options=False)
+        app_listen(app, 80, '0.0.0.0', server_settings)
+        server_settings = dict(ssl_options=True)
+        app_listen(app, 443, '0.0.0.0', server_settings)
+        self.assertEqual(open_to_public['https'], True)
+        self.assertEqual(open_to_public['http'], True)
diff --git a/webssh/handler.py b/webssh/handler.py
index 09665f8..f9bfd0d 100644
--- a/webssh/handler.py
+++ b/webssh/handler.py
@@ -43,6 +43,7 @@ open_to_public = {
 
 def config_open_to_public(address, server_type):
     status = True if is_name_open_to_public(address) else False
+    logging.debug('{} server open to public: {}'.format(server_type, status))
     open_to_public[server_type] = status