code: def test_limit_column_characters_all_unique(dataframe):
      df = dataframe.limit_column_characters(2)
      assert df.columns[0] == "a"
      assert df.columns[1] == "Be"
      assert df.columns[2] == "de"
      assert df.columns[3] == "an"
      assert df.columns[4] == "ci"
  
imports: import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_limit_column_characters_all_unique(dataframe) without return types