code: def test_groupby(self):
      # XXX: This is under tested
      # TODO:
      #  - apply
      #  - transform
      #  - Should passing a grouper that disallows duplicates propagate?
      df = pd.DataFrame({"A": [1, 2, 3]}).set_flags(
          allows_duplicate_labels=False
      )
      result = df.groupby([0, 0, 1]).agg("count")
      assert result.flags.allows_duplicate_labels is False
  
imports: import operator
  import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 11 for calling the TestPreserves obj's underlying member method code with example usage: obj.test_groupby() without return types