lbry-sdk/tests/integration/blockchain/test_blockchain_reorganization.py

import logging
from lbry.testcase import IntegrationTestCase


class BlockchainReorganizationTests(IntegrationTestCase):

    VERBOSITY = logging.WARN

    async def assertBlockHash(self, height):
        self.assertEqual(
            self.ledger.headers.hash(height).decode(),
            await self.blockchain.get_block_hash(height)
        )

    async def test_reorg(self):
        # invalidate current block, move forward 2
        self.assertEqual(self.ledger.headers.height, 200)
        await self.assertBlockHash(200)
        await self.blockchain.invalidate_block(self.ledger.headers.hash(200).decode())
        await self.blockchain.generate(2)
        await self.ledger.on_header.where(lambda e: e.height == 201)
        self.assertEqual(self.ledger.headers.height, 201)
        await self.assertBlockHash(200)
        await self.assertBlockHash(201)

        # invalidate current block, move forward 3
        await self.blockchain.invalidate_block(self.ledger.headers.hash(200).decode())
        await self.blockchain.generate(3)
        await self.ledger.on_header.where(lambda e: e.height == 202)
        self.assertEqual(self.ledger.headers.height, 202)
        await self.assertBlockHash(200)
        await self.assertBlockHash(201)
        await self.assertBlockHash(202)