code: def test_col_format_len(styler):
      # gh 46037
      result = styler.to_latex(
          environment="longtable", column_format="lrr{10cm}"
      )
      expected = r"\multicolumn{4}{r}{Continued on next page} \\"
      assert expected in result
  
imports: from textwrap import dedent
  import numpy
  import pytest
  from pandas import DataFrame, MultiIndex, Series, option_context
  from pandas.io.formats.style import Styler
  from pandas.io.formats.style_render import _parse_latex_cell_styles, _parse_latex_css_conversion, _parse_latex_header_span, _parse_latex_table_styles, _parse_latex_table_wrapping
label_desc: Use image node_id 52 for calling a global function with example usage: test_col_format_len(styler) without return types