text: #!/usr/bin/env python3
  # Copyright (c) 2019 The PIVX Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  '''
  Performs the same check as in Test_02 verifying that zPoS forked blocks that stake a zerocoin which is spent on mainchain on an higher block are still accepted.
  '''
  
  from test_framework.authproxy import JSONRPCException
  from fake_stake.base_test import SCTR_FakeStakeTest
  from time import sleep
  
  class zPoSFakeStakeAccepted(SCTR_FakeStakeTest):
  
  
      def set_test_params(self):
          ''' Setup test environment
          :param:
          :return:
          '''
          self.setup_clean_chain = True
          self.num_nodes = 1
          self.extra_args = [['-staking=1', '-debug=net', '-zsctrstake']] * self.num_nodes
  
      def run_test(self):
          self.description = "Performs the same check as in Test_02 verifying that zPoS forked blocks that stake a zerocoin which is spent on mainchain on an higher block are still accepted."
          self.init_test()
  
          DENOM_TO_USE = 1000  # zc denomination
          INITAL_MINED_BLOCKS = 321
          MORE_MINED_BLOCKS = 301
          FORK_DEPTH = 75
          self.NUM_BLOCKS = 2
  
          # 1) Starting mining blocks
          self.log.info("Mining %d blocks to get to zPOS activation...." % INITAL_MINED_BLOCKS)
          self.node.generate(INITAL_MINED_BLOCKS)
          sleep(2)
  
          # 2) Collect the possible prevouts and mint zerocoins with those
          self.log.info("Collecting all unspent coins which we generated from mining...")
          balance = self.node.getbalance("*", 100)
          self.log.info("Minting zerocoins...")
          initial_mints = 0
          while balance > DENOM_TO_USE:
              try:
                  self.node.mintzerocoin(DENOM_TO_USE)
              except JSONRPCException:
                  break
              sleep(1)
              initial_mints += 1
              self.node.generate(1)
              sleep(1)
  
              if initial_mints % 5 == 0:
                  self.log.info("Minted %d coins" % initial_mints)
              if initial_mints >= 20:
                  break
              balance = self.node.getbalance("*", 100)
          self.log.info("Minted %d coins in the %d-denom, remaining balance %d", initial_mints, DENOM_TO_USE, balance)
          sleep(2)
  
          # 3) mine more blocks
          self.log.info("Mining %d more blocks ... and getting spendable zerocoins" % MORE_MINED_BLOCKS)
          self.node.generate(MORE_MINED_BLOCKS)
          sleep(2)
          mints = self.node.listmintedzerocoins(True, True)
          sleep(1)
          mints_hashes = [x["serial hash"] for x in mints]
  
          # This mints are not ready spendable, only few of them.
          self.log.info("Got %d confirmed mints" % len(mints_hashes))
  
          # 4) Start mining again so that spends get confirmed in a block.
          self.log.info("Mining 200 more blocks...")
          self.node.generate(200)
          sleep(2)
  
          # 5) spend mints
          self.log.info("Spending mints in block %d..." % self.node.getblockcount())
          spends = 0
          for mint in mints_hashes:
              # create a single element list to pass to RPC spendzerocoinmints
              mint_arg = []
              mint_arg.append(mint)
              try:
                  self.node.spendzerocoinmints(mint_arg)
                  sleep(1)
                  spends += 1
              except JSONRPCException as e:
                  self.log.warning(str(e))
                  continue
          sleep(1)
          self.log.info("Successfully spent %d mints" % spends)
  
          self.log.info("Mining 6 more blocks...")
          self.node.generate(6)
          sleep(2)
  
          # 6) Collect some prevouts for random txes
          self.log.info("Collecting inputs for txes...")
          utxo_list = self.node.listunspent()
          sleep(1)
  
          # 7) Create valid forked zPoS blocks and send them
          self.log.info("Creating stake zPoS blocks...")
          err_msgs = self.test_spam("Fork", mints, spending_utxo_list=utxo_list, fZPoS=True, fRandomHeight=True, randomRange=FORK_DEPTH, randomRange2=50, fMustPass=True)
  
          if not len(err_msgs) == 0:
              self.log.error("result: " + " | ".join(err_msgs))
              raise AssertionError("TEST FAILED")
  
          self.log.info("%s PASSED" % self.__class__.__name__)
  
  if __name__ == '__main__':
      zPoSFakeStakeAccepted().main()
  