def test_replace_chain_bad_chain(blockchain_three_blocks):
blockchain = Blockchain() #blockchain solo con genesis
blockchain_three_blocks.chain[
1].hash = 'evil-hash' #cambiando el hash a un bloque para que sea una cadena mala
with pytest.raises(Exception,
match='Cannot replace.Incoming chain is invalid'
): #mismo error que se pone en raise Exception
blockchain.replace_chain(blockchain_three_blocks.chain)
def test_replace_chain_not_longer(blockchain_three_blocks):
blockchain = Blockchain() #blockchain solo con genesis
with pytest.raises(
Exception,
match='Cannot replace. The incoming chain must be longer'
): #mismo error que se pone en raise Exception
blockchain_three_blocks.replace_chain(blockchain.chain)
import time
from Backend.Blockchain.Blockchain import Blockchain
from Backend.Config import SECONDS
blockchain = Blockchain()
times = []
for i in range(1000):
start_time = time.time()
blockchain.add_block(i)
end_time = time.time()
time_to_mine = end_time - start_time / SECONDS
times.append(time_to_mine)
average_time = sum(times) / len(times)
print(f'New Block difficulty: {blockchain.chain[-1].difficulty}')
print(f'Time to mine new block {time_to_mine}s')
print(f'Average time to add blocks: {average_time}s\n')
def test_blockchain_instance():
blockchain = Blockchain()
assert blockchain.chain[0].hash == GENESIS_DATA['hash']
def test_replace_chain(blockchain_three_blocks):
blockchain = Blockchain() #blockchain solo con genesis
blockchain.replace_chain(
blockchain_three_blocks.chain
) #como blockchain_three_blocks es mas lago lo reemplaza
assert blockchain.chain == blockchain_three_blocks.chain #comprobando que paso la longitud
def test_is_valid_chain_bad_genesis_block(blockchain_three_blocks):
blockchain_three_blocks.chain[0].hash = 'evil-hash'
with pytest.raises(Exception, match='the genesis block must be invalid'
): #mismo error que se pone en raise Exception
Blockchain.is_valid_chain(blockchain_three_blocks.chain)
def test_is_valid_chain(blockchain_three_blocks):
Blockchain.is_valid_chain(blockchain_three_blocks.chain)
def blockchain_three_blocks():
blockchain = Blockchain()
for i in range(3):
blockchain.add_block(i)
return blockchain
def test_add_block():
blockchain = Blockchain()
data = 'test-data'
blockchain.add_block(data)
assert blockchain.chain[-1].data == data