text: #!/usr/bin/env python3
  # Copyright (c) 2014-2017 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 RPCs related to blockchainstate.
  
  Test the following RPCs:
      - getblockchaininfo
      - gettxoutsetinfo
      - getdifficulty
      - getbestblockhash
      - getblockhash
      - getblockheader
      - getchaintxstats
      - getnetworkhashps
      - verifychain
  
  Tests correspond to code in rpc/blockchain.cpp.
  """
  
  from decimal import Decimal
  import http.client
  import subprocess
  
  from test_framework.test_framework import SurgeTestFramework
  from test_framework.util import (
      assert_equal,
      assert_greater_than,
      assert_greater_than_or_equal,
      assert_raises,
      assert_raises_rpc_error,
      assert_is_hex_string,
      assert_is_hash_string,
  )
  
  class BlockchainTest(SurgeTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
  
      def run_test(self):
          #self._test_getblockchaininfo()
          self._test_gettxoutsetinfo()
          self._test_getblockheader()
          #self._test_getdifficulty()
          self.nodes[0].verifychain(0)
  
      def _test_getblockchaininfo(self):
          self.log.info("Test getblockchaininfo")
  
          keys = [
              'bestblockhash',
              'blocks',
              'chain',
              'chainwork',
              'difficulty',
              'headers',
              'verificationprogress',
              'warnings',
          ]
          res = self.nodes[0].getblockchaininfo()
          # result should have these additional pruning keys if manual pruning is enabled
          assert_equal(sorted(res.keys()), sorted(keys))
  
      def _test_gettxoutsetinfo(self):
          node = self.nodes[0]
          res = node.gettxoutsetinfo()
  
          assert_equal(res['total_amount'], Decimal('50000.00000000'))
          assert_equal(res['transactions'], 200)
          assert_equal(res['height'], 200)
          assert_equal(res['txouts'], 200)
          assert_equal(res['bestblock'], node.getblockhash(200))
          size = res['disk_size']
          assert_greater_than_or_equal(size, 6400)
          assert_greater_than_or_equal(64000, size)
          assert_equal(len(res['bestblock']), 64)
          assert_equal(len(res['hash_serialized_2']), 64)
  
      def _test_getblockheader(self):
          node = self.nodes[0]
  
          assert_raises_rpc_error(-5, "Block not found",
                                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(int(header['versionHex'], 16), int)
          assert isinstance(header['difficulty'], Decimal)
  
      def _test_getdifficulty(self):
          difficulty = self.nodes[0].getdifficulty()
          # 1 hash in 2 should be valid, so difficulty should be 1/2**31
          # binary => decimal => binary math is why we do this check
          assert abs(difficulty * 2**31 - 1) < 0.0001
  
  if __name__ == '__main__':
      BlockchainTest().main()
  