code: def duplicates_data():
      df = pd.DataFrame(
          dict(
              Foo=[1, 2, 3, 4, 5],
              foo=[1, 2, 3, 4, 5],
              fOo=[4, 5, 6, 7, 8],
              foO=[4, 4, 4, 4, 4],
              bar=[5, 5, 5, 6, 6],
          )
      )
      return df[["Foo", "foo", "fOo", "foO", "bar"]]
  
file_path: dtale/tests/dtale/test_duplicates.py
imports: import json
  import pandas
  import pytest
  from dtale.duplicate_checks import DuplicateCheck, NoDuplicatesException, NoDuplicatesToShowException, RemoveAllDataException
  from tests.dtale.test_views import app
  from tests.dtale import build_data_inst, build_dtypes
label_desc: Use image node_id 1 for calling a global function with example usage: duplicates_data() and returns: df