def METHOD_NAME(self):
    self.nodes[0].add_p2p_connection(P2PInterface())
    network_thread_start()
    # wait_for_verack ensures that the P2P connection is fully up.
    self.nodes[0].p2p.wait_for_verack()
    self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
    self.coinbase_blocks = self.nodes[0].generate(CLTV_HEIGHT - 2)
    self.nodeaddress = self.nodes[0].getnewaddress()
    self.log.info("Test that an invalid-according-to-CLTV transaction can still appear in a block")
    spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[0],
            self.nodeaddress, 1.0)
    cltv_invalidate(spendtx)
    spendtx.rehash()
    tip = self.nodes[0].getbestblockhash()
    block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
    block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time)
    block.nVersion = 3
    block.vtx.append(spendtx)
    block.hashMerkleRoot = block.calc_merkle_root()
    block.solve()
    self.nodes[0].p2p.send_and_ping(msg_block(block))
    assert_equal(self.nodes[0].getbestblockhash(), block.hash)
    self.log.info("Test that blocks must now be at least version 4")
    tip = block.sha256
    block_time += 1
    block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time)
    block.nVersion = 3
    block.solve()
    self.nodes[0].p2p.send_and_ping(msg_block(block))
    assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
    wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
    with mininode_lock:
        assert_equal(self.nodes[0].p2p.last_message["reject"].code, REJECT_OBSOLETE)
        assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'bad-version(0x00000003)')
        assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
        del self.nodes[0].p2p.last_message["reject"]
    self.log.info("Test that invalid-according-to-cltv transactions cannot appear in a block")
    block.nVersion = 4
    spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[1],
            self.nodeaddress, 1.0)
    cltv_invalidate(spendtx)
    spendtx.rehash()
    # First we show that this tx is valid except for CLTV by getting it
    # rejected from the mempool for exactly that reason.
    assert_raises_rpc_error(-26, 'non-mandatory-script-verify-flag (Negative locktime) (code 64)', self.nodes[0].sendrawtransaction, bytes_to_hex_str(spendtx.serialize()), True)
    # Now we verify that a block with this transaction is also invalid.
    block.vtx.append(spendtx)
    block.hashMerkleRoot = block.calc_merkle_root()
    block.solve()
    self.nodes[0].p2p.send_and_ping(msg_block(block))
    assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
    wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
    with mininode_lock:
        assert self.nodes[0].p2p.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
        assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
        if self.nodes[0].p2p.last_message["reject"].code == REJECT_INVALID:
            # Generic rejection when a block is invalid
            assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'block-validation-failed')
        else:
            assert b'Negative locktime' in self.nodes[0].p2p.last_message["reject"].reason
    self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
    spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
    spendtx.rehash()
    block.vtx.pop(1)
    block.vtx.append(spendtx)
    block.hashMerkleRoot = block.calc_merkle_root()
    block.solve()
    self.nodes[0].p2p.send_and_ping(msg_block(block))
    assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)