def reorg_test(self):
        # Node 1 will mine a 300 block chain starting 287 blocks back from Node 0 and Node 2's tip
        # This will cause Node 2 to do a reorg requiring 288 blocks of undo data to the reorg_test chain
        # Reboot node 1 to clear its mempool (hopefully make the invalidate faster)
        # Lower the block max size so we don't keep mining all our big mempool transactions (from disconnected blocks)
        self.stop_node(1)
        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-blockmaxweight=20000", "-checkblocks=5"])

        height = self.nodes[1].getblockcount()
        self.log.info("Current block height: %d" % height)

        invalidheight = height-287
        badhash = self.nodes[1].getblockhash(invalidheight)
        self.log.info("Invalidating block %s at height %d" % (badhash,invalidheight))
        self.nodes[1].invalidateblock(badhash)

        # We've now switched to our previously mined-24 block fork on node 1, but that's not what we want
        # So invalidate that fork as well, until we're on the same chain as node 0/2 (but at an ancestor 288 blocks ago)
        mainchainhash = self.nodes[0].getblockhash(invalidheight - 1)
        curhash = self.nodes[1].getblockhash(invalidheight - 1)
        while curhash != mainchainhash:
            self.nodes[1].invalidateblock(curhash)
            curhash = self.nodes[1].getblockhash(invalidheight - 1)

        assert(self.nodes[1].getblockcount() == invalidheight - 1)
        self.log.info("New best height: %d" % self.nodes[1].getblockcount())

        # Reboot node1 to clear those giant tx's from mempool
        self.stop_node(1)
        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-blockmaxweight=20000", "-checkblocks=5"])

        self.log.info("Generating new longer chain of 300 more blocks")
        self.nodes[1].generate(300)

        self.log.info("Reconnect nodes")
        connect_nodes(self.nodes[0], 1)
        connect_nodes(self.nodes[2], 1)
        sync_blocks(self.nodes[0:3], timeout=120)

        self.log.info("Verify height on node 2: %d" % self.nodes[2].getblockcount())
        self.log.info("Usage possibly still high bc of stale blocks in block files: %d" % calc_usage(self.prunedir))

        self.log.info("Mine 220 more blocks so we have requisite history (some blocks will be big and cause pruning of previous chain)")

        # Get node0's wallet transactions back in its mempool, to avoid the
        # mined blocks from being too small.
        self.nodes[0].resendwallettransactions()

        for i in range(22):
            # This can be slow, so do this in multiple RPC calls to avoid
            # RPC timeouts.
            self.nodes[0].generate(10) #node 0 has many large tx's in its mempool from the disconnects
        sync_blocks(self.nodes[0:3], timeout=300)

        usage = calc_usage(self.prunedir)
        self.log.info("Usage should be below target: %d" % usage)
        if (usage > 550):
            raise AssertionError("Pruning target not being met")

        return invalidheight,badhash

    def create_chain_with_staleblocks(self):
        # Create stale blocks in manageable sized chunks
        print "Mine 24 (stale) blocks on Node 1, followed by 25 (main chain) block reorg from Node 0, for 12 rounds"

        for j in xrange(12):
            # Disconnect node 0 so it can mine a longer reorg chain without knowing about node 1's soon-to-be-stale chain
            # Node 2 stays connected, so it hears about the stale blocks and then reorg's when node0 reconnects
            # Stopping node 0 also clears its mempool, so it doesn't have node1's transactions to accidentally mine
            stop_node(self.nodes[0],0)
            self.nodes[0]=start_node(0, self.options.tmpdir, ["-debug","-maxreceivebuffer=20000","-blockmaxsize=999000", "-checkblocks=5"], timewait=900)
            # Mine 24 blocks in node 1
            self.utxo = self.nodes[1].listunspent()
            for i in xrange(24):
                if j == 0:
                    self.mine_full_block(self.nodes[1],self.address[1])
                else:
                    self.nodes[1].generate(1) #tx's already in mempool from previous disconnects

            # Reorg back with 25 block chain from node 0
            self.utxo = self.nodes[0].listunspent()
            for i in xrange(25): 
                self.mine_full_block(self.nodes[0],self.address[0])

            # Create connections in the order so both nodes can see the reorg at the same time
            connect_nodes(self.nodes[1], 0)
            connect_nodes(self.nodes[2], 0)
            sync_blocks(self.nodes[0:3])

        print "Usage can be over target because of high stale rate:", calc_usage(self.prunedir)

    def create_chain_with_staleblocks(self):
        # Create stale blocks in manageable sized chunks
        self.log.info("Mine 24 (stale) blocks on Node 1, followed by 25 (main chain) block reorg from Node 0, for 12 rounds")

        for j in range(12):
            # Disconnect node 0 so it can mine a longer reorg chain without knowing about node 1's soon-to-be-stale chain
            # Node 2 stays connected, so it hears about the stale blocks and then reorg's when node0 reconnects
            # Stopping node 0 also clears its mempool, so it doesn't have node1's transactions to accidentally mine
            self.stop_node(0)
            self.start_node(0, extra_args=self.full_node_default_args)
            # Mine 24 blocks in node 1
            for i in range(24):
                if j == 0:
                    mine_large_block(self.nodes[1], self.utxo_cache_1)
                else:
                    # Add node1's wallet transactions back to the mempool, to
                    # avoid the mined blocks from being too small.
                    self.nodes[1].resendwallettransactions()
                    self.nodes[1].generate(1) #tx's already in mempool from previous disconnects

            # Reorg back with 25 block chain from node 0
            for i in range(25):
                mine_large_block(self.nodes[0], self.utxo_cache_0)

            # Create connections in the order so both nodes can see the reorg at the same time
            connect_nodes(self.nodes[1], 0)
            connect_nodes(self.nodes[2], 0)
            sync_blocks(self.nodes[0:3])

        self.log.info("Usage can be over target because of high stale rate: %d" % calc_usage(self.prunedir))

 def setup_network(self):
     args = ["-checkmempool", "-debug=mempool"]
     self.nodes = []
     self.nodes.append(start_node(0, self.options.tmpdir, args))
     self.nodes.append(start_node(1, self.options.tmpdir, args))
     connect_nodes(self.nodes[1], 0)
     self.is_network_split = False
     self.sync_all

 def setup_network(self, split=False):
     self.nodes = []
     # Start nodes with tiny block size of 11kb
     self.nodes.append(start_node(0, self.options.tmpdir, ["-blockprioritysize=7000", "-blockmaxsize=11000", "-maxorphantx=1000", "-relaypriority=true", "-printpriority=1"]))
     self.nodes.append(start_node(1, self.options.tmpdir, ["-blockprioritysize=7000", "-blockmaxsize=11000", "-maxorphantx=1000", "-relaypriority=true", "-printpriority=1"]))
     connect_nodes(self.nodes[1], 0)
     self.is_network_split=False
     self.sync_all()

 def setup_network(self):
     args = ["-checkmempool", "-debug=mempool", "-mempooltxinputlimit=2", "-nuparams=5ba81b19:110"]
     self.nodes = []
     self.nodes.append(start_node(0, self.options.tmpdir, args))
     self.nodes.append(start_node(1, self.options.tmpdir, args))
     connect_nodes(self.nodes[1], 0)
     self.is_network_split = False
     self.sync_all

    def setup_network(self):
        extra_args = [["-debug=1"] for _ in range(self.num_nodes)]
        for i, import_node in enumerate(IMPORT_NODES, 2):
            if import_node.prune:
                extra_args[i] += ["-prune=1"]

        self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
        for i in range(1, self.num_nodes):
            connect_nodes(self.nodes[i], 0)

 def setup_network(self):
     # This test relies on the chain setup being:
     # node0 <- node1 <- node2
     # Before leaving IBD, nodes prefer to download blocks from outbound
     # peers, so ensure that we're mining on an outbound peer and testing
     # block relay to inbound peers.
     self.setup_nodes()
     for i in range(self.num_nodes-1):
         connect_nodes(self.nodes[i+1], i)

    def setup_network(self):
        extra_args = [["-debug=1"] for _ in range(self.num_nodes)]
        for i, import_node in enumerate(IMPORT_NODES, 1):
            if import_node.prune:
                # txindex is enabled by default in Dash and needs to be disabled for import-rescan.py
                extra_args[i] += ["-prune=1", "-txindex=0", "-reindex-chainstate"]

        self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
        for i in range(1, self.num_nodes):
            connect_nodes(self.nodes[i], 0)

    def setup_network(self):
        extra_args = [["-addresstype=legacy"] for _ in range(self.num_nodes)]
        for i, import_node in enumerate(IMPORT_NODES, 2):
            if import_node.prune:
                extra_args[i] += ["-prune=1"]

        self.add_nodes(self.num_nodes, extra_args=extra_args)
        self.start_nodes()
        for i in range(1, self.num_nodes):
            connect_nodes(self.nodes[i], 0)

 def setup_network(self):
     args = ["-checkmempool", "-debug=mempool", "-blockmaxsize=4000",
         "-nuparams=5ba81b19:200", # Overwinter
         "-nuparams=76b809bb:210", # Sapling
     ]
     self.nodes = []
     self.nodes.append(start_node(0, self.options.tmpdir, args))
     self.nodes.append(start_node(1, self.options.tmpdir, args))
     connect_nodes(self.nodes[1], 0)
     self.is_network_split = False
     self.sync_all

    def setup_network(self):
        self.setup_nodes()

        self.prunedir = os.path.join(self.nodes[2].datadir, 'regtest', 'blocks', '')

        connect_nodes(self.nodes[0], 1)
        connect_nodes(self.nodes[1], 2)
        connect_nodes(self.nodes[2], 0)
        connect_nodes(self.nodes[0], 3)
        connect_nodes(self.nodes[0], 4)
        sync_blocks(self.nodes[0:5])

    def reorg_test(self):
        # Node 1 will mine a 300 block chain starting 287 blocks back from Node 0 and Node 2's tip
        # This will cause Node 2 to do a reorg requiring 288 blocks of undo data to the reorg_test chain
        # Reboot node 1 to clear its mempool (hopefully make the invalidate faster)
        # Lower the block max size so we don't keep mining all our big mempool transactions (from disconnected blocks)
        stop_node(self.nodes[1],1)
        self.nodes[1]=start_node(1, self.options.tmpdir, ["-debug","-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"], timewait=900)

        height = self.nodes[1].getblockcount()
        print "Current block height:", height

        invalidheight = height-287
        badhash = self.nodes[1].getblockhash(invalidheight)
        print "Invalidating block at height:",invalidheight,badhash
        self.nodes[1].invalidateblock(badhash)

        # We've now switched to our previously mined-24 block fork on node 1, but thats not what we want
        # So invalidate that fork as well, until we're on the same chain as node 0/2 (but at an ancestor 288 blocks ago)
        mainchainhash = self.nodes[0].getblockhash(invalidheight - 1)
        curhash = self.nodes[1].getblockhash(invalidheight - 1)
        while curhash != mainchainhash:
            self.nodes[1].invalidateblock(curhash)
            curhash = self.nodes[1].getblockhash(invalidheight - 1)

        assert(self.nodes[1].getblockcount() == invalidheight - 1)
        print "New best height", self.nodes[1].getblockcount()

        # Reboot node1 to clear those giant tx's from mempool
        stop_node(self.nodes[1],1)
        self.nodes[1]=start_node(1, self.options.tmpdir, ["-debug","-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"], timewait=900)

        print "Generating new longer chain of 300 more blocks"
        self.nodes[1].generate(300)

        print "Reconnect nodes"
        connect_nodes(self.nodes[0], 1)
        connect_nodes(self.nodes[2], 1)
        sync_blocks(self.nodes[0:3])

        print "Verify height on node 2:",self.nodes[2].getblockcount()
        print "Usage possibly still high bc of stale blocks in block files:", calc_usage(self.prunedir)

        print "Mine 220 more blocks so we have requisite history (some blocks will be big and cause pruning of previous chain)"
        self.nodes[0].generate(220) #node 0 has many large tx's in its mempool from the disconnects
        sync_blocks(self.nodes[0:3])

        usage = calc_usage(self.prunedir)
        print "Usage should be below target:", usage
        if (usage > 550):
            raise AssertionError("Pruning target not being met")

        return invalidheight,badhash

    def setup_network(self):
        self.nodes = []
        self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
        with open(self.alert_filename, 'w'):
            pass  # Just open then close to create zero-length file
        self.nodes.append(start_node(0, self.options.tmpdir,
                            ["-blockversion=2", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""]))
        # Node1 mines block.version=211 blocks
        self.nodes.append(start_node(1, self.options.tmpdir,
                                ["-blockversion=211"]))
        connect_nodes(self.nodes[1], 0)

        self.is_network_split = False
        self.sync_all()

 def setup_network(self):
     self.setup_nodes()
     connect_nodes(self.nodes[0], 3)
     connect_nodes(self.nodes[1], 3)
     connect_nodes(self.nodes[2], 3)
     connect_nodes(self.nodes[2], 0)
     self.sync_all()

 def start_three(self):
     self.nodes[0] = start_node(0, self.options.tmpdir)
     self.nodes[1] = start_node(1, self.options.tmpdir)
     self.nodes[2] = start_node(2, self.options.tmpdir)
     connect_nodes(self.nodes[0], 3)
     connect_nodes(self.nodes[1], 3)
     connect_nodes(self.nodes[2], 3)
     connect_nodes(self.nodes[2], 0)

 def start_three(self):
     self.start_node(0)
     self.start_node(1)
     self.start_node(2)
     connect_nodes(self.nodes[0], 3)
     connect_nodes(self.nodes[1], 3)
     connect_nodes(self.nodes[2], 3)
     connect_nodes(self.nodes[2], 0)

    def wallet_test(self):
        # check that the pruning node's wallet is still in good shape
        self.log.info("Stop and start pruning node to trigger wallet rescan")
        self.stop_node(2)
        self.start_node(2, extra_args=["-prune=550"])
        self.log.info("Success")

        # check that wallet loads successfully when restarting a pruned node after IBD.
        # this was reported to fail in #7494.
        self.log.info("Syncing node 5 to test wallet")
        connect_nodes(self.nodes[0], 5)
        nds = [self.nodes[0], self.nodes[5]]
        sync_blocks(nds, wait=5, timeout=300)
        self.stop_node(5) #stop and start to trigger rescan
        self.start_node(5, extra_args=["-prune=550"])
        self.log.info("Success")

    def setup_network(self):
        """Setup the test network topology

        Often you won't need to override this, since the standard network topology
        (linear: node0 <-> node1 <-> node2 <-> ...) is fine for most tests.

        If you do override this method, remember to start the nodes, assign
        them to self.nodes, connect them and then sync."""

        self.setup_nodes()

        # In this test, we're not connecting node2 to node0 or node1. Calls to
        # sync_all() should not include node2, since we're not expecting it to
        # sync.
        connect_nodes(self.nodes[0], 1)
        self.sync_all([self.nodes[0:1]])

    def setup_network(self):
        extra_args = [["-addresstype=legacy"] for _ in range(self.num_nodes)]
        for i, import_node in enumerate(IMPORT_NODES, 2):
            if import_node.prune:
                extra_args[i] += ["-prune=1"]

        self.add_nodes(self.num_nodes, extra_args=extra_args)

        # Import keys
        self.start_nodes(extra_args=[[]] * self.num_nodes)
        super().import_deterministic_coinbase_privkeys()
        self.stop_nodes()

        self.start_nodes()
        for i in range(1, self.num_nodes):
            connect_nodes(self.nodes[i], 0)