old_contents: """
  @file
  @brief run all unit tests
  """
  
  import unittest, os, sys, io
  
  def main():
      try:
          import pyquickhelper
      except ImportError:
          sys.path.append ( os.path.normpath (os.path.abspath(os.path.join( os.path.split(__file__)[0],"..","src"))))
          import pyquickhelper
  
      from pyquickhelper import fLOG, run_cmd, main_wrapper_tests
      fLOG(OutputPrint = True)
      main_wrapper_tests(__file__)
  
  if __name__ == "__main__" :
      main()
new_contents: """
  @file
  @brief run all unit tests
  """
  
  import unittest, os, sys, io
  
  def main():
      try:
          import pyquickhelper
      except ImportError:
          sys.path.append ( os.path.normpath (os.path.abspath(os.path.join( os.path.split(__file__)[0],"..","src"))))
          import pyquickhelper
  
      from pyquickhelper import fLOG, main_wrapper_tests
      fLOG(OutputPrint = True)
      main_wrapper_tests(__file__)
  
  if __name__ == "__main__" :
      main()
subject: remove unnecessary import