diff --git a/tests/unit/test_dependency_register.py b/tests/unit/test_dependency_register.py
index <HASH>..<HASH> 100644
--- a/tests/unit/test_dependency_register.py
+++ b/tests/unit/test_dependency_register.py
@@ -160,7 +160,7 @@ class Test_DependencyRegister_register:
     def test__giving_resource_name_and_dependent__should_only_call_expected_methods(
             self, dep_reg, mock_dep_reg, fake_resource_name, fake_dependent):
 
-        def give_unexpected_calls(method_calls, expected_method_names):
+        def give_unexpected_calls(method_calls, expected_methods_names):
             return [call for call in method_calls
                     if call[0] not in expected_methods_names]
tests: Fixes bug in previous commit: typo in function arg name.

The inner function give_unexpected_calls() had an argument 'expected_method_names' which should have been 'expected_methods_names'.