new_contents: import unittest
  import zlib
  
  from jackrabbit.compressors.zlib_compressor import ZlibCompressor
  
  
  class TestZlibCompressor(unittest.TestCase):
      def test_compress(self):
          s = 'The quick brown fox jumps over the lazy dog'
          c = ZlibCompressor.compress(s)
          self.assertEqual(zlib.compress(s), c)
  
      def test_decompress(self):
          c = 'x\x9c\x0b\xc9HU(,\xcdL\xceVH*\xca/\xcfSH\xcb\xafP\xc8*\xcd-(V\xc8/K-R(\x01J\xe7$VU*\xa4\xe4\xa7\x03\x00[\xdc\x0f\xda'
          s = ZlibCompressor.decompress(c)
          self.assertEqual('The quick brown fox jumps over the lazy dog', s)
  
subject: Add zlib compressor tests