diff --git a/pydatastructs/linear_data_structures/tests/test_linked_lists.py b/pydatastructs/linear_data_structures/tests/test_linked_lists.py
index 63d473bbd..0087031f4 100644
--- a/pydatastructs/linear_data_structures/tests/test_linked_lists.py
+++ b/pydatastructs/linear_data_structures/tests/test_linked_lists.py
@@ -13,15 +13,16 @@ def test_DoublyLinkedList():
     dll.insert_after(dll[-1], 4)
     dll.insert_after(dll[2], 6)
     dll.insert_before(dll[4], 1)
+    dll.insert_before(dll[0], 7)
     dll.insert_at(0, 2)
     dll.insert_at(-1, 9)
     dll.extract(2)
     dll.extract(0)
     dll.extract(-1)
     dll[-2].data = 0
-    assert str(dll) == "[2, 1, 6, 1, 0, 9]"
-    assert len(dll) == 6
-    assert raises(IndexError, lambda: dll.insert_at(7, None))
+    assert str(dll) == "[7, 5, 1, 6, 1, 0, 9]"
+    assert len(dll) == 7
+    assert raises(IndexError, lambda: dll.insert_at(8, None))
     assert raises(IndexError, lambda: dll.extract(20))
     dll_copy = copy.deepcopy(dll)
     for i in range(len(dll)):