new_contents: 
  import unittest
  import os
  
  from msi.io.tiffwriter import TiffWriter
  from msi.io.tiffreader import TiffReader
  from msi.test import helpers
  
  
  class TestTiffWriter(unittest.TestCase):
  
      def setUp(self):
          # setup file and the path where it shall be written to
          self.msi = helpers.getFakeMsi()
          self.msi.set_image(self.msi.get_image())
          self.fileUriToWrite = os.path.join(os.getcwd(), "testfiles")
  
      def tearDown(self):
          # remove the hopefully written files
          folder, file_prefix = os.path.split(self.fileUriToWrite)
          image_files = [f for f in os.listdir(folder) if
                         os.path.isfile(os.path.join(folder, f))]
          image_files = [f for f in image_files if f.startswith(file_prefix)]
          # expand to full path
          image_files = [os.path.join(folder, f) for f in image_files]
          for f in image_files:
              os.remove(f)
  
      def test_imageWriterCreatesFile(self):
          writer = TiffWriter(self.msi, convert_to_nm=False)
          writer.write(self.fileUriToWrite)
  
      def test_imageWriterCreatesCorrectFile(self):
          writer = TiffWriter(self.msi, convert_to_nm=False)
          writer.write(self.fileUriToWrite)
  
          reader = TiffReader(shift_bits=0)
          msi = reader.read(self.fileUriToWrite)
          self.assertTrue(msi == helpers.getFakeMsi(),
                                         "image correctly written and read")
  
subject: Add a test for the new tiff writer.