old_contents: # Import nacl libs
  import libnacl
  
  # Import python libs
  import unittest
  
  
  class TestHash(unittest.TestCase):
      '''
      Test sign functions
      '''
      def test_hash(self):
          msg1 = b'Are you suggesting coconuts migrate?'
          msg2 = b'Not at all, they could be carried.'
          chash1 = libnacl.crypto_hash(msg1)
          chash2 = libnacl.crypto_hash(msg2)
          self.assertNotEqual(msg1, chash1)
          self.assertNotEqual(msg2, chash2)
          self.assertNotEqual(chash2, chash1)
  
  
new_contents: # Import nacl libs
  import libnacl
  from hashlib import sha256, sha512
  
  # Import python libs
  import unittest
  
  
  class TestHash(unittest.TestCase):
      """
      Test sign functions
      """
      def test_hash(self):
          msg1 = b'Are you suggesting coconuts migrate?'
          msg2 = b'Not at all, they could be carried.'
          chash1 = libnacl.crypto_hash(msg1)
          chash2 = libnacl.crypto_hash(msg2)
          self.assertNotEqual(msg1, chash1)
          self.assertNotEqual(msg2, chash2)
          self.assertNotEqual(chash2, chash1)
  
          ref256 = sha256(msg1)
          self.assertEqual(ref256.digest_size, libnacl.crypto_hash_sha256_BYTES)
          self.assertEqual(ref256.digest(), libnacl.crypto_hash_sha256(msg1))
  
          ref512 = sha512(msg1)
          self.assertEqual(ref512.digest_size, libnacl.crypto_hash_sha512_BYTES)
          self.assertEqual(ref512.digest(), libnacl.crypto_hash_sha512(msg1))
  
  
subject: add tests for hash256 & hash512 raw api