need to set show_messages=True in explicit show_messages test

Author: keflavich

astroquery/esa/hubble/tests/test_esa_hubble.py

@@ -738,7 +738,7 @@ def test_cone_search_criteria_typeerror(self, mock_query_criteria):
     @patch('astroquery.esa.integral.core.pyvo.dal.TAPService.capabilities', [])
     @patch('astroquery.esa.utils.utils.execute_servlet_request')
     def test_show_messages(self, mock_execute_servlet_request):
-        ESAHubbleClass()
+        ESAHubbleClass(show_messages=True)
         mock_execute_servlet_request.assert_called()
 
     def test_parse_messages_response(self):