old_contents: """Utilities for tests.
  """
  import codecs
  import codecs
  import os
  import re
  
  
  def strip_ansi(string):
      """Strip ANSI encoding from given string.
      
      Parameters
      ----------
      string : str
          String from which encoding needs to be removed
      
      Returns
      -------
      str
          Encoding free string
      """
      pattern = r'(\x1b\[|\x9b)[^@-_]*[@-_]|\x1b[@-_]'
      return re.sub(pattern, '', string, flags=re.I)
  
  
  def remove_file(filename):
      """Removes file silently.
      
      Parameters
      ----------
      filename : str
          File name to be removed
      
      Raises
      ------
      Exception
          If given file is not deletable
      """
      try:
          os.remove(filename)
      except OSError as e:
          if e.errno != errno.ENOENT:
              raise Exception(e)
  
  
  def decode_utf_8_text(text):
      """Decodes the text from utf-8 format.
      
      Parameters
      ----------
      text : str
          Text to be decoded
      
      Returns
      -------
      str
          Decoded text
      """
      try:
          return codecs.decode(text, 'utf-8')
      except:
          return text
  
  
  def encode_utf_8_text(text):
      """Encodes the text to utf-8 format
      
      Parameters
      ----------
      text : str
          Text to be encoded
      
      Returns
      -------
      str
          Encoded text
      """
      try:
          return codecs.encode(text, 'utf-8')
      except:
          return text
  
new_contents: """Utilities for tests.
  """
  import errno
  import codecs
  import os
  import re
  
  
  def strip_ansi(string):
      """Strip ANSI encoding from given string.
      
      Parameters
      ----------
      string : str
          String from which encoding needs to be removed
      
      Returns
      -------
      str
          Encoding free string
      """
      pattern = r'(\x1b\[|\x9b)[^@-_]*[@-_]|\x1b[@-_]'
      return re.sub(pattern, '', string, flags=re.I)
  
  
  def remove_file(filename):
      """Removes file silently.
      
      Parameters
      ----------
      filename : str
          File name to be removed
      
      Raises
      ------
      Exception
          If given file is not deletable
      """
      try:
          os.remove(filename)
      except OSError as e:
          if e.errno != errno.ENOENT:
              raise Exception(e)
  
  
  def decode_utf_8_text(text):
      """Decodes the text from utf-8 format.
      
      Parameters
      ----------
      text : str
          Text to be decoded
      
      Returns
      -------
      str
          Decoded text
      """
      try:
          return codecs.decode(text, 'utf-8')
      except:
          return text
  
  
  def encode_utf_8_text(text):
      """Encodes the text to utf-8 format
      
      Parameters
      ----------
      text : str
          Text to be encoded
      
      Returns
      -------
      str
          Encoded text
      """
      try:
          return codecs.encode(text, 'utf-8')
      except:
          return text
  
subject: Test Utils: Cleans up the code