old_contents: """
  py.test tests/ --cov=src/mrfitty
  """
  from mrfitty.combination_fit import ReferenceSpectrum
  
  
  def test_fit_with_fixed_energy_range(tmpdir):
      pass
  
  
  def test_fit():
      pass
  
new_contents: """
  py.test tests/ --cov=src/mrfitty
  """
  
  
  def test_fit_with_fixed_energy_range(tmpdir):
      pass
  
  
  def test_fit():
      pass
  
subject: remove unused import