Make default_config only return a dict representation

This does make mypy happy, and does reduce a bit of confusion, though it's
a shame we have to duplicate the parsing code around everywhere now.

Is there a better way to solve this?

tests/http/federation/test_matrix_federation_agent.py

@@ -67,7 +67,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
 
         self.mock_resolver = Mock()
 
-        config_dict = default_config("test", parse=False)
+        config_dict = default_config("test")
         config_dict["federation_custom_ca_list"] = [get_test_ca_cert_file()]
 
         self._config = config = HomeServerConfig()
@@ -957,7 +957,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
         self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
         self.reactor.lookups["testserv"] = "1.2.3.4"
 
-        config = default_config("test", parse=True)
+        config_dict = default_config("test")
+        config = HomeServerConfig()
+        config.parse_config_dict(config_dict)
 
         # Build a new agent and WellKnownResolver with a different tls factory
         tls_factory = FederationPolicyForHTTPS(config)

tests/storage/test_base.py

@@ -18,6 +18,7 @@ from unittest.mock import Mock
 
 from twisted.internet import defer
 
+from synapse.config.homeserver import HomeServerConfig
 from synapse.storage._base import SQLBaseStore
 from synapse.storage.database import DatabasePool
 from synapse.storage.engines import create_engine
@@ -47,7 +48,10 @@ class SQLBaseStoreTestCase(unittest.TestCase):
 
         self.db_pool.runWithConnection = runWithConnection
 
-        config = default_config(name="test", parse=True)
+        config_dict = default_config(name="test")
+        config = HomeServerConfig()
+        config.parse_config_dict(config_dict)
+
         hs = TestHomeServer("test", config=config)
 
         sqlite_config = {"name": "sqlite3"}

tests/test_state.py

@@ -19,6 +19,7 @@ from twisted.internet import defer
 from synapse.api.auth import Auth
 from synapse.api.constants import EventTypes, Membership
 from synapse.api.room_versions import RoomVersions
+from synapse.config.homeserver import HomeServerConfig
 from synapse.events import make_event_from_dict
 from synapse.events.snapshot import EventContext
 from synapse.state import StateHandler, StateResolutionHandler
@@ -172,7 +173,11 @@ class StateTestCase(unittest.TestCase):
                 "hostname",
             ]
         )
-        hs.config = default_config("tesths", True)
+
+        config_dict = default_config("tesths")
+        hs.config = HomeServerConfig()
+        hs.config.parse_config_dict(config_dict)
+
         hs.get_datastore.return_value = self.store
         hs.get_state_handler.return_value = None
         hs.get_clock.return_value = MockClock()

tests/utils.py

@@ -104,9 +104,15 @@ def setupdb():
         atexit.register(_cleanup)
 
 
-def default_config(name, parse=False):
+def default_config(name: str) -> Dict[str, Any]:
     """
     Create a reasonable test config.
+
+    Args:
+        name: The value of the 'server_name' option in the returned config.
+
+    Returns:
+        A sensible, default homeserver config.
     """
     config_dict = {
         "server_name": name,
@@ -175,11 +181,6 @@ def default_config(name, parse=False):
         "listeners": [{"port": 0, "type": "http"}],
     }
 
-    if parse:
-        config = HomeServerConfig()
-        config.parse_config_dict(config_dict, "", "")
-        return config
-
     return config_dict
 
 
@@ -212,9 +213,10 @@ def setup_test_homeserver(
         from twisted.internet import reactor
 
     if config is None:
-        config = default_config(name, parse=True)
+        config_dict = default_config(name)
 
-    config.ldap_enabled = False
+        config = HomeServerConfig()
+        config.parse_config_dict(config_dict)
 
     if "clock" not in kwargs:
         kwargs["clock"] = MockClock()