Improve error message when client is not yet initialised #3698
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User.client
is only set afteropen
is called. Since having a validclient
instance is necessary to test anything, whetherclient
is set is checked in most methods. However, this is done with a simpleassert self.client
, which gives an opaqueAssertionError
if the user has indeed forgotten to callopen
. This PR improves the error message to specifically call that out.