text: #!/usr/bin/env python2
  # Copyright (c) 2014-2019 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 fee estimation code
  #
  
  from test_framework import BitcoinTestFramework
  from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
  from util import *
  
  class EstimateFeeTest(BitcoinTestFramework):
  
      def setup_network(self):
          self.nodes = []
          self.nodes.append(start_node(0, self.options.tmpdir,
                              ["-debug=mempool", "-debug=estimatefee", "-relaypriority=0"]))
          # Node1 mines small-but-not-tiny blocks, and allows free transactions.
          # NOTE: the CreateNewBlock code starts counting block size at 1,000 bytes,
          # so blockmaxsize of 2,000 is really just 1,000 bytes (room enough for
          # 6 or 7 transactions)
          self.nodes.append(start_node(1, self.options.tmpdir,
                                  ["-blockprioritysize=1500", "-blockmaxsize=2000",
                                   "-debug=mempool", "-debug=estimatefee", "-relaypriority=0"]))
          connect_nodes(self.nodes[1], 0)
  
          # Node2 is a stingy miner, that
          # produces very small blocks (room for only 3 or so transactions)
          node2args = [ "-blockprioritysize=0", "-blockmaxsize=1500",
                        "-debug=mempool", "-debug=estimatefee", "-relaypriority=0"]
          self.nodes.append(start_node(2, self.options.tmpdir, node2args))
          connect_nodes(self.nodes[2], 0)
  
          self.is_network_split = False
          self.sync_all()
          
  
      def run_test(self):
          # Prime the memory pool with pairs of transactions
          # (high-priority, random fee and zero-priority, random fee)
          min_fee = Decimal("0.001")
          fees_per_kb = [];
          for i in range(12):
              (txid, txhex, fee) = random_zeropri_transaction(self.nodes, Decimal("1.1"),
                                                              min_fee, min_fee, 20)
              tx_kbytes = (len(txhex)/2)/1000.0
              fees_per_kb.append(float(fee)/tx_kbytes)
  
          # Mine blocks with node2 until the memory pool clears:
          count_start = self.nodes[2].getblockcount()
          while len(self.nodes[2].getrawmempool()) > 0:
              self.nodes[2].setgenerate(True, 1)
              self.sync_all()
  
          all_estimates = [ self.nodes[0].estimatefee(i) for i in range(1,20) ]
          print("Fee estimates, super-stingy miner: "+str([str(e) for e in all_estimates]))
  
          # Estimates should be within the bounds of what transactions fees actually were:
          delta = 1.0e-6 # account for rounding error
          for e in filter(lambda x: x >= 0, all_estimates):
              if float(e)+delta < min(fees_per_kb) or float(e)-delta > max(fees_per_kb):
                  raise AssertionError("Estimated fee (%f) out of range (%f,%f)"%(float(e), min_fee_kb, max_fee_kb))
  
          # Generate transactions while mining 30 more blocks, this time with node1:
          for i in range(30):
              for j in range(random.randrange(6-4,6+4)):
                  (txid, txhex, fee) = random_transaction(self.nodes, Decimal("1.1"),
                                                          Decimal("0.0"), min_fee, 20)
                  tx_kbytes = (len(txhex)/2)/1000.0
                  fees_per_kb.append(float(fee)/tx_kbytes)
              self.nodes[1].setgenerate(True, 1)
              self.sync_all()
  
          all_estimates = [ self.nodes[0].estimatefee(i) for i in range(1,20) ]
          print("Fee estimates, more generous miner: "+str([ str(e) for e in all_estimates]))
          for e in filter(lambda x: x >= 0, all_estimates):
              if float(e)+delta < min(fees_per_kb) or float(e)-delta > max(fees_per_kb):
                  raise AssertionError("Estimated fee (%f) out of range (%f,%f)"%(float(e), min_fee_kb, max_fee_kb))
  
          # Finish by mining a normal-sized block:
          while len(self.nodes[0].getrawmempool()) > 0:
              self.nodes[0].setgenerate(True, 1)
              self.sync_all()
  
          final_estimates = [ self.nodes[0].estimatefee(i) for i in range(1,20) ]
          print("Final fee estimates: "+str([ str(e) for e in final_estimates]))
  
  
  if __name__ == '__main__':
      EstimateFeeTest().main()
  