def test_is_proof_of_work_valid():
last_proof = Blockchain.genesis_block.proof
assert Miner._is_proof_of_work_valid(last_proof=last_proof,
proof=1,
difficulty=1)
assert Miner._is_proof_of_work_valid(last_proof=last_proof,
proof=350,
difficulty=2)
assert Miner._is_proof_of_work_valid(last_proof=last_proof,
proof=3969,
difficulty=3)
assert Miner._is_proof_of_work_valid(last_proof=last_proof,
proof=15558,
difficulty=4)
# difficulty has to be a positive integer value
with pytest.raises(ValueError) as error:
Miner._is_proof_of_work_valid(last_proof=last_proof,
proof=16,
difficulty=0)
assert "'difficulty' has to be a positive integer value." == str(
error.value)
with pytest.raises(ValueError) as error:
Miner._is_proof_of_work_valid(last_proof=last_proof,
proof=16,
difficulty=-1)
assert "'difficulty' has to be a positive integer value." == str(
error.value)
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_proof_of_work(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)
proof_of_work_difficulty_1 = miner._proof_of_work(last_proof=None,
difficulty=1)
proof_of_work_difficulty_2 = miner._proof_of_work(last_proof=None,
difficulty=2)
proof_of_work_difficulty_3 = miner._proof_of_work(last_proof=None,
difficulty=3)
proof_of_work_difficulty_4 = miner._proof_of_work(last_proof=None,
difficulty=4)
proof_of_work_difficulty_5 = miner._proof_of_work(last_proof=None,
difficulty=5)
assert proof_of_work_difficulty_1 == 1
assert proof_of_work_difficulty_2 == 350
assert proof_of_work_difficulty_3 == 3969
assert proof_of_work_difficulty_4 == 15558
assert proof_of_work_difficulty_5 == 1406000
def test_constructor_invalid_neighbours(neighbours, clean_chain_file_fixture):
with pytest.raises(ValueError, match="'neighbours'"):
Miner(path_to_chain=path_to_chain,
json_format=True,
port=DEFAULT_PORT,
difficulty=DEFAULT_DIFFICULTY,
neighbours=neighbours,
force_new_chain=False)
def test_constructor_invalid_difficulty(difficulty, clean_chain_file_fixture):
with pytest.raises(ValueError,
match="'difficulty' is of wrong type or lower than 1!"):
Miner(path_to_chain=path_to_chain,
json_format=True,
port=DEFAULT_PORT,
difficulty=difficulty,
neighbours=[("localhost", 12345)],
force_new_chain=False)
def test_constructor_invalid_port(port, clean_chain_file_fixture):
with pytest.raises(ValueError,
match="'port' is of wrong type or out of range!"):
Miner(path_to_chain=path_to_chain,
json_format=True,
port=port,
difficulty=DEFAULT_DIFFICULTY,
neighbours=[("localhost", 12345)],
force_new_chain=False)
def test_constructor_invalid_json_format(json_format,
clean_chain_file_fixture):
with pytest.raises(ValueError,
match="'json_format' has to be a boolean value!"):
Miner(path_to_chain=path_to_chain,
json_format=json_format,
port=DEFAULT_PORT,
difficulty=DEFAULT_DIFFICULTY,
neighbours=[("localhost", 12345)],
force_new_chain=False)
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)
def test_constructor(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=["localhost:12345"],
force_new_chain=False)
assert isinstance(miner, Miner)
assert miner.blockchain.chain[0] == Blockchain.genesis_block
assert miner.blockchain.last_block == Blockchain.genesis_block
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()