diff --git a/lib/galaxy/tool_util/unittest_utils/__init__.py b/lib/galaxy/tool_util/unittest_utils/__init__.py
index cd527f21260..fbe392e6498 100644
--- a/lib/galaxy/tool_util/unittest_utils/__init__.py
+++ b/lib/galaxy/tool_util/unittest_utils/__init__.py
@@ -1,11 +1,11 @@
-from galaxy.util.bunch import Bunch
+from unittest.mock import Mock
 
 
 def mock_trans(has_user=True, is_admin=False):
     """A mock ``trans`` object for exposing user info to toolbox filter unit tests."""
-    trans = Bunch(user_is_admin=is_admin)
+    trans = Mock(user_is_admin=is_admin)
     if has_user:
-        trans.user = Bunch(preferences={})
+        trans.user = Mock(preferences={})
     else:
         trans.user = None
     return trans
diff --git a/setup.cfg b/setup.cfg
index d0240643107..ffa5d652aa9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -66,8 +66,6 @@ check_untyped_defs = False
 check_untyped_defs = False
 [mypy-galaxy.tools.bundled.data_source.microbial_import_code]
 check_untyped_defs = False
-[mypy-galaxy.tool_util.unittest_utils]
-check_untyped_defs = False
 [mypy-galaxy.security]
 check_untyped_defs = False
 [mypy-galaxy.datatypes.converters.pileup_to_interval_index_converter]