diff --git a/lab - linked list lab/TestDequesDifferentially.py b/lab - linked list lab/TestDequesDifferentially.py
new file mode 100644
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+++ b/lab - linked list lab/TestDequesDifferentially.py	
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+"""
+Create a new Python file and a new test class TestDequesDifferentially.
+In it, write differential test cases exercising collections.deque (a
+built-in, array-based implementation with slightly different method
+namesLinks to an external site.) and your LinkedDeque implementation.
+Your test should exercise the deques in a variety of situations,
+including situations where they have been modified on both sides.
+Verify that the two implementations agree on your test cases.
+"""
+from unittest import TestCase
+from linked_list_example import doubly_linked_node
+from linked_list_example import LinkedDeque
+
+class TestDequesDifferentially(TestCase):
+