def test_is_chain_valid__wrong_genesis(json_format, clean_chain_file_fixture):
miner = Miner(path_to_chain=path_to_chain,
json_format=json_format,
port=DEFAULT_PORT,
difficulty=DEFAULT_DIFFICULTY,
neighbours=[],
force_new_chain=False)
genesis_hash = miner._hash(miner.blockchain.last_block)
miner.blockchain.add_new_block(data=Data("Some test data."),
proof=1406000,
previous_hash=genesis_hash)
second_block_hash = miner._hash(miner.blockchain.last_block)
miner.blockchain.add_new_block(data=Data("Some more test data."),
proof=423135,
previous_hash=second_block_hash)
# wrong index, correct previous hash
miner.blockchain.chain[0]._index = 1
assert not miner._is_chain_valid()
# wrong index, wrong previous hash
miner.blockchain.chain[
0]._previous_hash = "e59be601c9213694f0b72534148199b24d1ed7c1c29c02ba4602e780015a7663"
assert not miner._is_chain_valid()
# correct index, wrong previous hash
miner.blockchain.chain[0]._index = 0
assert not miner._is_chain_valid()
# cleanup ..
miner.blockchain.chain[0]._previous_hash = None
def test_is_chain_valid__wrong_block_2(json_format, clean_chain_file_fixture):
miner = Miner(path_to_chain=path_to_chain,
json_format=json_format,
port=DEFAULT_PORT,
difficulty=DEFAULT_DIFFICULTY,
neighbours=[],
force_new_chain=False)
genesis_hash = miner._hash(miner.blockchain.last_block)
miner.blockchain.add_new_block(data=Data("Some test data."),
proof=1406000,
previous_hash=genesis_hash)
second_block_hash = miner._hash(miner.blockchain.last_block)
miner.blockchain.add_new_block(data=Data("Some more test data."),
proof=423135,
previous_hash=second_block_hash)
# wrong index, correct previous hash, correct proof of work, correct timestamp
miner.blockchain.chain[2]._index = 42
assert not miner._is_chain_valid()
# wrong index, wrong previous hash, correct proof of work, correct timestamp
miner.blockchain.chain[2]._previous_hash = None
assert not miner._is_chain_valid()
# wrong index, wrong previous hash, wrong proof of work, correct timestamp
miner.blockchain.chain[2]._proof = 1234876423876
assert not miner._is_chain_valid()
# wrong index, wrong previous hash, wrong proof of work, wrong timestamp
miner.blockchain.chain[2]._timestamp = miner.blockchain.chain[0].timestamp
assert not miner._is_chain_valid()
# correct index, wrong previous hash, wrong proof of work, wrong timestamp
miner.blockchain.chain[2]._index = 2
assert not miner._is_chain_valid()
# correct index, correct previous hash, wrong proof of work, wrong timestamp
miner.blockchain.chain[2]._previous_hash = second_block_hash
assert not miner._is_chain_valid()
# correct index, correct previous hash, correct proof of work, wrong timestamp
miner.blockchain.chain[2]._proof = 423135
assert not miner._is_chain_valid()
def test_is_chain_valid__valid_chain(json_format, clean_chain_file_fixture):
miner = Miner(path_to_chain=path_to_chain,
json_format=json_format,
port=DEFAULT_PORT,
difficulty=DEFAULT_DIFFICULTY,
neighbours=[],
force_new_chain=False)
genesis_hash = miner._hash(miner.blockchain.last_block)
miner.blockchain.add_new_block(data=Data("Some test data."),
proof=1406000,
previous_hash=genesis_hash)
second_block_hash = miner._hash(miner.blockchain.last_block)
miner.blockchain.add_new_block(data=Data("Some more test data."),
proof=423135,
previous_hash=second_block_hash)
assert miner._is_chain_valid()
def test_hash(json_format, clean_chain_file_fixture):
miner = Miner(path_to_chain=path_to_chain,
json_format=json_format,
port=DEFAULT_PORT,
difficulty=DEFAULT_DIFFICULTY,
neighbours=[],
force_new_chain=False)
assert Blockchain.genesis_block_hash == miner._hash(
Blockchain.genesis_block)
# only Block objects are hashable by Miner objects
with pytest.raises(ValueError) as error:
string_object = "This is a random String object"
miner._hash(string_object)
# correct error?
assert "Only `Block` objects are hashable!" == str(error.value)