new_contents: import pytest
  from demag import Demag
  
  class TestDemag(object):
      def test_get_mif(self):
          demag = Demag()
  
          mif = demag.get_mif()
          mif_lines = mif.split('\n')
  
          # Assert comment line.
          l = mif_lines[0].split()
          assert l[0] == '#'
          assert l[1] == 'Demag'
  
          # Assert Specify line.
          assert mif[-2:] == '\n\n'
          l = mif_lines[1].split()
          assert l[0] == 'Specify'
          assert l[1] == 'Oxs_Demag'
          assert l[2] == '{}'
  
subject: Add Demag tests.