Autoformat tests with black

tests/conftest.py

@@ -124,6 +124,7 @@ def pytest_terminal_summary(terminalreporter):
         for line in summary_lines:
             tr.write_line(line)
 
+
 @pytest.fixture
 def imap(maildomain):
     return ImapConn(maildomain)
@@ -241,7 +242,6 @@ def db(tmpdir):
     return Database(db_path)
 
 
-
 #
 # Delta Chat testplugin re-use
 # use the cmfactory fixture to get chatmail instance accounts