code: def test_round_digits(dataframe):
      """Checks rounding to the specified number of digits."""
      df = dataframe.round_to_fraction("Bell__Chart", 7, digits=3)
      assert df.iloc[0, 1] == 1.286
      assert df.iloc[1, 1] == 2.429
      assert df.iloc[2, 1] == 3.286
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_round_digits(dataframe) without return types