There are no build tests for XMPP
There aren't currently any tests to ensure XMPP is functional.
However, it's unclear if anyone uses this functionality in Symbiosis at present, as it mostly looks like other chat systems (Slack and its companions) have supplanted running your own instance, especially as there's no web front end so you would need to run a local client.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information