diff --git a/pyproject.toml b/pyproject.toml
index 75d90c1..7db6fb6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ target-version = "py312"
 line-length = 88
 
 [tool.ruff.lint]
-select = ["PL"]
+select = ["B", "F", "PL"]
 
 [tool.ruff.lint.isort]
 known-first-party = ["into-dbus-python"]
diff --git a/src/dbus_python_client_gen/__init__.py b/src/dbus_python_client_gen/__init__.py
index acfd826..0f4f35e 100644
--- a/src/dbus_python_client_gen/__init__.py
+++ b/src/dbus_python_client_gen/__init__.py
@@ -5,18 +5,16 @@
 Top-level classes and methods.
 """
 
-from ._errors import (
-    DPClientError,
-    DPClientGenerationError,
-    DPClientGetPropertyContext,
-    DPClientInvalidArgError,
-    DPClientInvocationContext,
-    DPClientInvocationError,
-    DPClientKeywordError,
-    DPClientMarshallingError,
-    DPClientMethodCallContext,
-    DPClientRuntimeError,
-    DPClientSetPropertyContext,
-)
-from ._invokers import make_class
-from ._version import __version__
+from ._errors import DPClientError as DPClientError
+from ._errors import DPClientGenerationError as DPClientGenerationError
+from ._errors import DPClientGetPropertyContext as DPClientGetPropertyContext
+from ._errors import DPClientInvalidArgError as DPClientInvalidArgError
+from ._errors import DPClientInvocationContext as DPClientInvocationContext
+from ._errors import DPClientInvocationError as DPClientInvocationError
+from ._errors import DPClientKeywordError as DPClientKeywordError
+from ._errors import DPClientMarshallingError as DPClientMarshallingError
+from ._errors import DPClientMethodCallContext as DPClientMethodCallContext
+from ._errors import DPClientRuntimeError as DPClientRuntimeError
+from ._errors import DPClientSetPropertyContext as DPClientSetPropertyContext
+from ._invokers import make_class as make_class
+from ._version import __version__ as __version__
diff --git a/src/dbus_python_client_gen/_errors.py b/src/dbus_python_client_gen/_errors.py
index 8b4ee3e..19aaa77 100644
--- a/src/dbus_python_client_gen/_errors.py
+++ b/src/dbus_python_client_gen/_errors.py
@@ -5,10 +5,8 @@
 Exception hierarchy for this package.
 """
 
-from abc import ABC
 
-
-class DPClientInvocationContext(ABC):
+class DPClientInvocationContext:
     """
     Identifies the context in which an invocation error occurred.
 
diff --git a/tests/test_generated.py b/tests/test_generated.py
index 0cb16d0..7ca4887 100644
--- a/tests/test_generated.py
+++ b/tests/test_generated.py
@@ -51,7 +51,7 @@ def _test_property(self, klass, prop):
             self.assertTrue(hasattr(prop_klass, "Get"))
 
             with self.assertRaises(AttributeError):
-                getattr(prop_klass, "Get")(None)
+                prop_klass.Get(None)
 
         if "write" in access:
             self.assertTrue(hasattr(prop_klass, "Set"))
@@ -63,14 +63,14 @@ def _test_property(self, klass, prop):
                 pass
             else:
                 with self.assertRaises(DPClientMarshallingError):
-                    getattr(prop_klass, "Set")(None, None)
+                    prop_klass.Set(None, None)
 
         if "readwrite" in access:
             self.assertTrue(hasattr(prop_klass, "Get"))
             self.assertTrue(hasattr(prop_klass, "Set"))
 
             with self.assertRaises(AttributeError):
-                getattr(prop_klass, "Get")(None)
+                prop_klass.Get(None)
 
     def _test_method(self, klass, method):
         """
@@ -95,8 +95,8 @@ def _test_klasses(self):
             self.assertTrue(hasattr(klass, "Properties"))
             self.assertTrue(hasattr(klass, "Methods"))
 
-            properties = getattr(klass, "Properties")
-            methods = getattr(klass, "Methods")
+            properties = klass.Properties
+            methods = klass.Methods
 
             for method in spec.findall("./method"):
                 self._test_method(methods, method)