Fix eventlet wsgi websocket __call__ return

engineio/async_eventlet.py

@@ -10,7 +10,7 @@ def __call__(self, environ, start_response):
             raise RuntimeError('You need to use the eventlet server. '
                                'See the Deployment section of the '
                                'documentation for more information.')
-        super(WebSocketWSGI, self).__call__(environ, start_response)
+        return super(WebSocketWSGI, self).__call__(environ, start_response)
 
 
 async = {

tests/test_async_eventlet.py

@@ -0,0 +1,25 @@
+import logging
+import unittest
+
+import six
+if six.PY3:
+    from unittest import mock
+else:
+    import mock
+
+from engineio import async_eventlet
+
+
+class TestServer(unittest.TestCase):
+    def setUp(self):
+        logging.getLogger('engineio').setLevel(logging.NOTSET)
+
+    @mock.patch('engineio.async_eventlet._WebSocketWSGI.__call__',
+                return_value='data')
+    def test_wsgi_call(self, _WebSocketWSGI):
+        _WebSocketWSGI.__call__ = lambda e,s: 'data'
+        environ = {"eventlet.input": None}
+        start_response = "bar"
+        wsgi = async_eventlet.WebSocketWSGI(None)
+        self.assertEqual(wsgi(environ, start_response), 'data')
+