old_contents: #!/usr/bin/env python2
  
  from prioritize import Prioritize
  
  deps = set(
      [('c', 'a'),
       ('d', 'a'),
       ('g', 'a'),
       ('c', 'b'),
       ('b', 'd'),
       ('e', 'd'),
       ('e', 'f'),
       ('f', 'g'),
       ('g', 'b'),
       ])
  p = Prioritize()
  p.convertFrom(deps)
  print(p._priorityLevel)
  
  deps = set(
      [('a', 'b'),
       ('b', 'c'),
       ('b', 'd'),
       ('c', 'e'),
       ('d', 'e'),
       ('e', 'f'),
       ('g', 'd')
       ])
  p.convertFrom(deps)
  print(p._priorityLevel)
  
  deps = set([('a', 'b')])
  p.convertFrom(deps)
  print(p._priorityLevel)
  
  deps = set(
      [('a', 'b'),
       ('b', 'c'),
       ('c', 'a')
       ])
  p.convertFrom(deps)
  print(p._priorityLevel)
  
new_contents: #!/usr/bin/env python2
  
  from prioritize import Prioritize
  
  deps = set(
      [('c', 'a'),
       ('d', 'a'),
       ('g', 'a'),
       ('c', 'b'),
       ('b', 'd'),
       ('e', 'd'),
       ('e', 'f'),
       ('f', 'g'),
       ('g', 'b'),
       ])
  p = Prioritize()
  p.convertFrom(deps)
  print(p._priorityLevel)
  """
  Expected result:
  a: 0
  d: 1
  b: 2
  c/g: 3
  f: 4
  e: 5
  """
  
  deps = set(
      [('a', 'b'),
       ('b', 'c'),
       ('b', 'd'),
       ('c', 'e'),
       ('d', 'e'),
       ('e', 'f'),
       ('g', 'd')
       ])
  p.convertFrom(deps)
  print(p._priorityLevel)
  """
  Expected result:
  f: 0
  e: 1
  c/d: 2
  b/g: 3
  a: 4
  """
  
  deps = set([('a', 'b')])
  p.convertFrom(deps)
  print(p._priorityLevel)
  """
  Expected result:
  b: 0
  a: 1
  """
  
  deps = set(
      [('a', 'b'),
       ('b', 'c'),
       ('c', 'a')
       ])
  p.convertFrom(deps)
  print(p._priorityLevel)
  """
  Expected result:
  ERROR
  """
  
  
subject: Add expected result in test code.