Add some tests for `password_auth_providers` (#8819)

These things seemed to be completely untested, so I added a load of tests for
them.

1 files changed, 1 insertions, 0 deletions

diff --git a/mypy.ini b/mypy.ini

index a5503abe26..3c8d303064 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -80,6 +80,7 @@ files =
   synapse/util/metrics.py,
   tests/replication,
   tests/test_utils,
+  tests/handlers/test_password_providers.py,
   tests/rest/client/v2_alpha/test_auth.py,
   tests/util/test_stream_change_cache.py