def test_is_valid_transaction_chain_duplicate_transactions(blockchain_3b):
trans = Transaction(Wallet(), 'recipient', 1).to_json()
# Add block with list of transactions containing two identical transactions
# (a duplicate)
blockchain_3b.add_block([trans, trans])
with pytest.raises(Exception, match='is not unique.'):
Blockchain.is_valid_trans_chain(blockchain_3b.chain)
def test_is_valid_transaction_chain_bad_histroric_balance(blockchain_3b):
wallet = Wallet()
bad_trans = Transaction(wallet, 'recipient', 1)
bad_trans.output[wallet.address] = 9001
bad_trans.input['amount'] = 9002
bad_trans.input['signature'] = wallet.sign(bad_trans.output)
blockchain_3b.add_block([bad_trans.to_json()])
with pytest.raises(Exception, match='has an invalid input amount.'):
Blockchain.is_valid_trans_chain(blockchain_3b.chain)
def test_valid_transaction_chain(blockchain_3b):
Blockchain.is_valid_trans_chain(blockchain_3b.chain)
def test_is_valid_transaction_chain_bad_transaction(blockchain_3b):
bad_trans = Transaction(Wallet(), 'recipient', 1)
bad_trans.input['signature'] = Wallet().sign(bad_trans.output)
blockchain_3b.add_block([bad_trans.to_json()])
with pytest.raises(Exception):
Blockchain.is_valid_trans_chain(blockchain_3b.chain)
def test_is_valid_transaction_chain_multiple_rewards(blockchain_3b):
reward1 = Transaction.reward_transaction(Wallet()).to_json()
reward2 = Transaction.reward_transaction(Wallet()).to_json()
blockchain_3b.add_block([reward1, reward2])
with pytest.raises(Exception, match='one mining reward per block.'):
Blockchain.is_valid_trans_chain(blockchain_3b.chain)
