def METHOD_NAME(self):
    assert_equal(self.nodes[0].getblockcount(), 200)
    # Mine three blocks. After this, nodes[0] blocks
    # 101, 102, and 103 are spend-able.
    new_blocks = self.nodes[1].generate(4)
    self.sync_all()
    print(self.nodes[0].getblockcount())
    node0_address = self.nodes[0].getnewaddress()
    node1_address = self.nodes[1].getnewaddress()
    # Three scenarios for re-orging coinbase spends in the memory pool:
    # 1. Direct coinbase spend  :  spend_101
    # 2. Indirect (coinbase spend in chain, child in mempool) : spend_102 and spend_102_1
    # 3. Indirect (coinbase and child both in chain) : spend_103 and spend_103_1
    # Use invalidatblock to make all of the above coinbase sp
    # ends invalid (immature coinbase),
    # and make sure the mempool code behaves correctly.
    b = [ self.nodes[0].getblockhash(n) for n in range(101, 105) ]
    coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
    spend_101_raw = create_tx(self.nodes[0], coinbase_txids[1], node1_address, 34)
    spend_102_raw = create_tx(self.nodes[0], coinbase_txids[2], node0_address, 34.1)
    spend_103_raw = create_tx(self.nodes[0], coinbase_txids[3], node0_address, 34)
    # Create a block-height-locked transaction which will be invalid after reorg
    timelock_tx = self.nodes[0].createrawtransaction([{"txid": coinbase_txids[0], "vout": 0}], {node0_address: 34})
    # Set the time lock
    timelock_tx = timelock_tx.replace("ffffffff", "11111191", 1)
    timelock_tx = timelock_tx[:-8] + hex(self.nodes[0].getblockcount() + 2)[2:] + "000000"
    timelock_tx = self.nodes[0].signrawtransaction(timelock_tx)["hex"]
    assert_raises(JSONRPCException, self.nodes[0].sendrawtransaction, timelock_tx)
    # Broadcast and mine spend_102 and 103:
    spend_102_id = self.nodes[0].sendrawtransaction(spend_102_raw)
    spend_103_id = self.nodes[0].sendrawtransaction(spend_103_raw)
    self.nodes[0].generate(1)
    assert_raises(JSONRPCException, self.nodes[0].sendrawtransaction, timelock_tx)
    # Create 102_1 and 103_1:
    spend_102_1_raw = create_tx(self.nodes[0], spend_102_id, node1_address, 33.01)
    spend_103_1_raw = create_tx(self.nodes[0], spend_103_id, node1_address, 33.1)
    # Broadcast and mine 103_1:
    spend_103_1_id = self.nodes[0].sendrawtransaction(spend_103_1_raw)
    last_block = self.nodes[0].generate(1)
    timelock_tx_id = self.nodes[0].sendrawtransaction(timelock_tx)
    # ... now put spend_101 and spend_102_1 in memory pools:
    spend_101_id = self.nodes[0].sendrawtransaction(spend_101_raw)
    spend_102_1_id = self.nodes[0].sendrawtransaction(spend_102_1_raw)
    self.sync_all()
    assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, timelock_tx_id})
    for node in self.nodes:
        node.invalidateblock(last_block[0])
    assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, spend_103_1_id})
    # Use invalidateblock to re-org back and make all those coinbase spends
    # immature/invalid:
    for node in self.nodes:
        node.invalidateblock(new_blocks[0])
    self.sync_all()
    # mempool should be empty.
    assert_equal(set(self.nodes[0].getrawmempool()), set())