fix: virtual connections username

Closes #1626

VirtualConnections leverages the ConnectionItem object to parse
the database connections server response. Most of other endpoints
return "userName" and the VirtualConnections' "Get Database Connections"
endpoint returns "username." Resolves the issue by allowing the
ConnectionItem to read either. Update the test assets to reflect the
actual returned value.

Author: jorwoods

tableauserverclient/models/connection_item.py

@@ -108,7 +108,7 @@ def from_response(cls, resp, ns) -> list["ConnectionItem"]:
             connection_item.embed_password = string_to_bool(connection_xml.get("embedPassword", ""))
             connection_item.server_address = connection_xml.get("serverAddress", connection_xml.get("server", None))
             connection_item.server_port = connection_xml.get("serverPort", connection_xml.get("port", None))
-            connection_item.username = connection_xml.get("userName", None)
+            connection_item.username = connection_xml.get("userName", connection_xml.get("username", None))
             connection_item._query_tagging = (
                 string_to_bool(s) if (s := connection_xml.get("queryTagging", None)) else None
             )

test/assets/virtual_connection_populate_connections.xml

@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api http://tableau.com/api/ts-api-2.3.xsd">
     <virtualConnectionConnections>
-    <connection id="37ca6ced-58d7-4dcf-99dc-f0a85223cbef" dbClass="postgres" serverAddress="localhost" userName="pgadmin" serverPort="5432"/>
+    <connection id="37ca6ced-58d7-4dcf-99dc-f0a85223cbef" dbClass="postgres" serverAddress="localhost" username="pgadmin" serverPort="5432"/>
     </virtualConnectionConnections>
 </tsResponse>

test/assets/virtual_connection_populate_connections2.xml

@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api http://tableau.com/api/ts-api-2.3.xsd">
     <virtualConnectionConnections>
-    <connection connectionId="37ca6ced-58d7-4dcf-99dc-f0a85223cbef" dbClass="postgres" server="localhost" userName="pgadmin" port="5432"/>
+    <connection connectionId="37ca6ced-58d7-4dcf-99dc-f0a85223cbef" dbClass="postgres" server="localhost" username="pgadmin" port="5432"/>
     </virtualConnectionConnections>
 </tsResponse>