diff --git a/tests/common_testing.py b/tests/common_testing.py
index 729d56e72..9935f07a1 100644
--- a/tests/common_testing.py
+++ b/tests/common_testing.py
@@ -16,6 +16,14 @@ def assertSeparate(self, tensor1, tensor2) -> None:
             tensor1.storage().data_ptr(), tensor2.storage().data_ptr()
         )
 
+    def assertNotSeparate(self, tensor1, tensor2) -> None:
+        """
+        Verify that tensor1 and tensor2 have their data in the same locations.
+        """
+        self.assertEqual(
+            tensor1.storage().data_ptr(), tensor2.storage().data_ptr()
+        )
+
     def assertAllSeparate(self, tensor_list) -> None:
         """
         Verify that all tensors in tensor_list have their data in