code: def test_limit_column_characters(dataframe):
      df = dataframe.limit_column_characters(1)
      assert df.columns[0] == "a"
      assert df.columns[1] == "B"
      assert df.columns[2] == "d"
      assert df.columns[3] == "a_1"
      assert df.columns[4] == "c"
  
imports: import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: test_limit_column_characters(dataframe) without return types