code: def test_repr_unicode_columns(self):
      df = DataFrame(
          {"\u05d0": [1, 2, 3], "\u05d1": [4, 5, 6], "c": [7, 8, 9]}
      )
      repr(df.columns)
  
imports: from datetime import datetime, timedelta
  from io import StringIO
  import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas import NA, Categorical, CategoricalIndex, DataFrame, IntervalIndex, MultiIndex, NaT, PeriodIndex, Series, Timestamp, date_range, option_context, period_range
  import pandas._testing
label_desc: Use image node_id 21 for calling the TestDataFrameRepr obj's underlying member method code with example usage: obj.test_repr_unicode_columns() without return types