text: import sys
  import unittest
  
  
  try:
      import crypt
      IMPORT_ERROR = None
  except ImportError as ex:
      crypt = None
      IMPORT_ERROR = str(ex)
  
  
  @unittest.skipIf(crypt, 'This should only run on windows')
  class TestWhyCryptDidNotImport(unittest.TestCase):
      def test_failure_only_for_windows(self):
          self.assertEqual(sys.platform, 'win32')
  
      def test_import_failure_message(self):
          self.assertIn('not supported', IMPORT_ERROR)
  
  
  @unittest.skipUnless(crypt, 'Not supported on Windows')
  class CryptTestCase(unittest.TestCase):
  
      def test_crypt(self):
          cr = crypt.crypt('mypassword')
          cr2 = crypt.crypt('mypassword', cr)
          self.assertEqual(cr2, cr)
          cr = crypt.crypt('mypassword', 'ab')
          if cr is not None:
              cr2 = crypt.crypt('mypassword', cr)
              self.assertEqual(cr2, cr)
  
      def test_salt(self):
          self.assertEqual(len(crypt._saltchars), 64)
          for method in crypt.methods:
              salt = crypt.mksalt(method)
              self.assertIn(len(salt) - method.salt_chars, {0, 1, 3, 4, 6, 7})
              if method.ident:
                  self.assertIn(method.ident, salt[:len(salt)-method.salt_chars])
  
      def test_saltedcrypt(self):
          for method in crypt.methods:
              cr = crypt.crypt('assword', method)
              self.assertEqual(len(cr), method.total_size)
              cr2 = crypt.crypt('assword', cr)
              self.assertEqual(cr2, cr)
              cr = crypt.crypt('assword', crypt.mksalt(method))
              self.assertEqual(len(cr), method.total_size)
  
      def test_methods(self):
          self.assertTrue(len(crypt.methods) >= 1)
          if sys.platform.startswith('openbsd'):
              self.assertEqual(crypt.methods, [crypt.METHOD_BLOWFISH])
          else:
              self.assertEqual(crypt.methods[-1], crypt.METHOD_CRYPT)
  
      @unittest.skipUnless(
          crypt
          and (
              crypt.METHOD_SHA256 in crypt.methods or crypt.METHOD_SHA512 in crypt.methods
          ),
          'requires support of SHA-2',
      )
      def test_sha2_rounds(self):
          for method in (crypt.METHOD_SHA256, crypt.METHOD_SHA512):
              for rounds in 1000, 10_000, 100_000:
                  salt = crypt.mksalt(method, rounds=rounds)
                  self.assertIn('$rounds=%d$' % rounds, salt)
                  self.assertEqual(len(salt) - method.salt_chars,
                                   11 + len(str(rounds)))
                  cr = crypt.crypt('mypassword', salt)
                  self.assertTrue(cr)
                  cr2 = crypt.crypt('mypassword', cr)
                  self.assertEqual(cr2, cr)
  
      @unittest.skipUnless(
          crypt and crypt.METHOD_BLOWFISH in crypt.methods, 'requires support of Blowfish'
      )
      def test_blowfish_rounds(self):
          for log_rounds in range(4, 11):
              salt = crypt.mksalt(crypt.METHOD_BLOWFISH, rounds=1 << log_rounds)
              self.assertIn('$%02d$' % log_rounds, salt)
              self.assertIn(len(salt) - crypt.METHOD_BLOWFISH.salt_chars, {6, 7})
              cr = crypt.crypt('mypassword', salt)
              self.assertTrue(cr)
              cr2 = crypt.crypt('mypassword', cr)
              self.assertEqual(cr2, cr)
  
      def test_invalid_rounds(self):
          for method in (crypt.METHOD_SHA256, crypt.METHOD_SHA512,
                         crypt.METHOD_BLOWFISH):
              with self.assertRaises(TypeError):
                  crypt.mksalt(method, rounds='4096')
              with self.assertRaises(TypeError):
                  crypt.mksalt(method, rounds=4096.0)
              for rounds in (0, 1, -1, 1<<999):
                  with self.assertRaises(ValueError):
                      crypt.mksalt(method, rounds=rounds)
          with self.assertRaises(ValueError):
              crypt.mksalt(crypt.METHOD_BLOWFISH, rounds=1000)
          for method in (crypt.METHOD_CRYPT, crypt.METHOD_MD5):
              with self.assertRaisesRegex(ValueError, 'support'):
                  crypt.mksalt(method, rounds=4096)
  
  
  if __name__ == "__main__":
      unittest.main()
  