black-format tests/rest/client/v1/test_login.py
black-format tests/rest/client/v1/test_login.py

black seems to want to reformat this, despite `black --check` being happy with
it :/

matrix-org/synapse,matrix-org/synapse,matrix-org/synapse,matrix-org/synapse,matrix-org/synapse,matrix-org/synapse