new_contents: from pip.req.req_file import (parse_requirement_options, parse_content,
                                parse_line, join_lines, ignore_comments,
                                partition_line, REQUIREMENT_EDITABLE, REQUIREMENT,
                                FLAG, OPTION)
  
  
  class TestIgnoreComments(object):
      """tests for `ignore_comment`"""
      pass
  
  
  class TestPartitionLine(object):
      """tests for `partition_line`"""
      pass
  
  
  class TestJoinLines(object):
      """tests for `join_lines`"""
      pass
  
  
  class TestParseRequirementOptions(object):
      """tests for `parse_requirement_options`"""
      pass
  
  
  class TestParseLine(object):
      """tests for `parse_line`"""
      pass
  
  
  class TestParseContent(object):
      """tests for `parse_content`"""
      pass
  
  
  class TestParseRequirements(object):
      """tests for `parse_requirements`"""
      pass
  
subject: create new test module for req_file.py and stub out the classes