text: #!/usr/bin/env python2
  # Copyright (c) 2014-2015 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 RPC calls related to blockchain state. Tests correspond to code in
  # rpcblockchain.cpp.
  #
  
  from decimal import Decimal
  
  from test_framework.test_framework import IranbitTestFramework
  from test_framework.authproxy import JSONRPCException
  from test_framework.util import (
      initialize_chain,
      assert_equal,
      assert_raises,
      assert_is_hex_string,
      assert_is_hash_string,
      start_nodes,
      connect_nodes_bi,
  )
  
  
  class BlockchainTest(IranbitTestFramework):
      """
      Test blockchain-related RPC calls:
  
          - gettxoutsetinfo
  
      """
  
      def setup_chain(self):
          print("Initializing test directory " + self.options.tmpdir)
          initialize_chain(self.options.tmpdir)
  
      def setup_network(self, split=False):
          self.nodes = start_nodes(2, self.options.tmpdir)
          connect_nodes_bi(self.nodes, 0, 1)
          self.is_network_split = False
          self.sync_all()
  
      def run_test(self):
          self._test_gettxoutsetinfo()
          self._test_getblockheader()
  
      def _test_gettxoutsetinfo(self):
          node = self.nodes[0]
          res = node.gettxoutsetinfo()
  
          assert_equal(res[u'total_amount'], Decimal('8725.00000000'))
          assert_equal(res[u'transactions'], 200)
          assert_equal(res[u'height'], 200)
          assert_equal(res[u'txouts'], 200)
          assert_equal(res[u'bytes_serialized'], 13924),
          assert_equal(len(res[u'bestblock']), 64)
          assert_equal(len(res[u'hash_serialized']), 64)
  
      def _test_getblockheader(self):
          node = self.nodes[0]
  
          assert_raises(
              JSONRPCException, lambda: node.getblockheader('nonsense'))
  
          besthash = node.getbestblockhash()
          secondbesthash = node.getblockhash(199)
          header = node.getblockheader(besthash)
  
          assert_equal(header['hash'], besthash)
          assert_equal(header['height'], 200)
          assert_equal(header['confirmations'], 1)
          assert_equal(header['previousblockhash'], secondbesthash)
          assert_is_hex_string(header['chainwork'])
          assert_is_hash_string(header['hash'])
          assert_is_hash_string(header['previousblockhash'])
          assert_is_hash_string(header['merkleroot'])
          assert_is_hash_string(header['bits'], length=None)
          assert isinstance(header['time'], int)
          assert isinstance(header['mediantime'], int)
          assert isinstance(header['nonce'], int)
          assert isinstance(header['version'], int)
          assert isinstance(header['difficulty'], Decimal)
  
  if __name__ == '__main__':
      BlockchainTest().main()
  