text: #!/usr/bin/env python3
  # Copyright (c) 2017 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test the -uacomment option."""
  
  from test_framework.test_framework import ClearCoinTestFramework
  from test_framework.util import assert_equal
  
  class UacommentTest(ClearCoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.setup_clean_chain = True
  
      def run_test(self):
          self.log.info("test multiple -uacomment")
          test_uacomment = self.nodes[0].getnetworkinfo()["subversion"][-12:-1]
          assert_equal(test_uacomment, "(testnode0)")
  
          self.restart_node(0, ["-uacomment=foo"])
          foo_uacomment = self.nodes[0].getnetworkinfo()["subversion"][-17:-1]
          assert_equal(foo_uacomment, "(testnode0; foo)")
  
          self.log.info("test -uacomment max length")
          self.stop_node(0)
          expected = "exceeds maximum length (256). Reduce the number or size of uacomments."
          self.assert_start_raises_init_error(0, ["-uacomment=" + 'a' * 256], expected)
  
          self.log.info("test -uacomment unsafe characters")
          for unsafe_char in ['/', ':', '(', ')']:
              expected = "User Agent comment (" + unsafe_char + ") contains unsafe characters"
              self.assert_start_raises_init_error(0, ["-uacomment=" + unsafe_char], expected)
  
  if __name__ == '__main__':
      UacommentTest().main()
  