code: def test_simple_line_detection():
      page_layout = load_pdf("tests/fixtures/io/example.pdf")[0]
  
      pdf_lines = simple_line_detection(page_layout)
  
      assert len(pdf_lines) == 15
  
imports: from layoutparser import load_pdf
  from layoutparser.tools import generalized_connected_component_analysis_1d, simple_line_detection, group_textblocks_based_on_category
label_desc: Use image node_id 2 for calling a global function with example usage: test_simple_line_detection() without return types