add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/tc-testing/tdc_helper.py
..
..
@@ -17,7 +17,10 @@
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 def get_unique_item(lst):
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     """ For a list, return a list of the unique items in the list. """
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-    return list(set(lst))
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+    if len(lst) > 1:
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+        return list(set(lst))
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+    else:
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+        return lst
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 def get_test_categories(alltests):