old_contents: #!/usr/bin/python
  
  import sys
  sys.path.append('../src')
  
  import drake
  
  drake.run('..')
  
new_contents: #!/usr/bin/python
  
  import os
  import sys
  
  sys.path.append('../src')
  if 'PYTHONPATH' in os.environ:
    os.environ['PYTHONPATH'] = '../src:%s' % os.environ['PYTHONPATH']
  else:
    os.environ['PYTHONPATH'] = '../src'
  
  import drake
  
  drake.run('..')
  
subject: Add drake in the PYTHONPATH for the tests.