new_contents: import luhnProofFunction
  
  tooShort = '123'
  def test_proof_too_short_fails(tooShort):
      assert doLuhn(tooShort) == False
  
  tooLong = '123456789123456789'
  def test_proof_too_long_fails(tooLong):
      assert doLuhn(tooLong) == False
  
  sixteenDigitLuhn = '2222222222222224'
  def test_16_digit_proof_success(sixteenDigitLuhn):
      assert doLuhn(sixteenDigitLuhn) == True
  
  sixteenDigitDud = '2222222222222222'
  def test_16_digit_proof_fails(sixteenDigitDud):
      assert doLuhn(sixteenDigitDud) == False
  
  fifteenDigitLuhn = '111111111111119'
  def test_15_digit_proof_success(fifteenDigitLuhn):
      assert doLuhn(fifteenDigitLuhn) == True
  
  fifteenDigitDud = '111111111111111'
  def test_15_digit_proof_fails(fifteenDigitDud):
      assert doLuhn(fifteenDigitDud) == False
  
  fourteenDigitLuhn = '33333333333330'
  def test_14_digit_proof_success(fourteenDigitLuhn):
      assert doLuhn(fourteenDigitLuhn) == True
  
  fourteenDigitDud = '33333333333330'
  def test_14_digit_proof_fails(fourteenDigitDud):
      assert doLuhn(fourteenDigitDud) == False
  
  anyAlphaFails = '3a333333333330'
  def test_14_digit_proof_fails(anyAlphaFails):
      assert doLuhn(anyAlphaFails) == False
  
  anythinButDigitsFails = '33.3333333330'
  def test_14_digit_proof_fails(anythinButDigitsFails):
      assert doLuhn(anythinButDigitsFails) == False
  
subject: add luhnTestProofs.py