old_contents: from nose.tools import istest, assert_equal
  
  from mammoth import style_reader
  from mammoth.options import read_options, _default_style_map
  
  
  @istest
  def default_style_map_is_used_if_style_map_is_not_set():
      assert_equal(_default_style_map, read_options({})["style_map"])
  
  
  @istest
  def custom_style_mappings_are_prepended_to_default_style_mappings():
      style_map = read_options({
          "style_map": "p.SectionTitle => h2"
      })["style_map"]
      assert_equal(style_reader.read_style("p.SectionTitle => h2"), style_map[0])
      assert_equal(_default_style_map, style_map[1:])
  
  
  @istest
  def default_style_mappings_are_ignored_if_include_default_style_map_is_false():
      style_map = read_options({
          "style_map": "p.SectionTitle => h2",
          "include_default_style_map": False
      })["style_map"]
      assert_equal([style_reader.read_style("p.SectionTitle => h2")], style_map)
  
new_contents: from nose.tools import istest, assert_equal
  
  from mammoth import style_reader
  from mammoth.options import read_options, _default_style_map
  
  
  @istest
  def default_style_map_is_used_if_style_map_is_not_set():
      assert_equal(_default_style_map, read_options({})["style_map"])
  
  
  @istest
  def custom_style_mappings_are_prepended_to_default_style_mappings():
      style_map = read_options({
          "style_map": "p.SectionTitle => h2"
      })["style_map"]
      assert_equal(style_reader.read_style("p.SectionTitle => h2"), style_map[0])
      assert_equal(_default_style_map, style_map[1:])
  
  
  @istest
  def default_style_mappings_are_ignored_if_include_default_style_map_is_false():
      style_map = read_options({
          "style_map": "p.SectionTitle => h2",
          "include_default_style_map": False
      })["style_map"]
      assert_equal([style_reader.read_style("p.SectionTitle => h2")], style_map)
  
  
  @istest
  def lines_starting_with_hash_in_custom_style_map_are_ignored():
      style_map = read_options({
          "style_map": "#p.SectionTitle => h3\np.SectionTitle => h2",
          "include_default_style_map": False
      })["style_map"]
      assert_equal([style_reader.read_style("p.SectionTitle => h2")], style_map)
  
subject: Add test to ensure that style map lines beginning with hash are ignored