SubscriptionsTransportWS.SocketTest.connect

You're seeing just the macro connect, go back to SubscriptionsTransportWS.SocketTest module for more information.
Link to this macro

connect(handler, params, connect_info \\ quote do %{} end)

View Source (macro)

Initiates a transport connection for the socket handler. Useful for testing UserSocket authentication. Returns the result of the handler's connect/3 callback.