def test_for_mining_block():
last_block = Block.genesis_block_generator()
data = 'test-data'
block = Block.mine_the_block(last_block, data)
assert isinstance(block, Block)
assert block.data == data
assert block.last_hash == last_block.hash
assert convert_hex_to_binary(block.hash)[0:block.difficulty] == '0' * block.difficulty
def chain_is_valid(chain):
"""
In this block, I validate the incoming chain.
The whole point, it to ednforce the following rules of the blockchain:
- the chain starts with the genesis block
- blocks must be formatted correctly
"""
if chain[0] != Block.genesis_block_generator():
raise Exception('The Genesis Block Must Be Valid')
for i in range(1, len(chain)):
block = chain[i]
last_block = chain[i-1]
Block.block_is_valid(last_block, block)
Blockchain.transaction_chain_is_valid(chain)
def last_block():
return Block.genesis_block_generator()
def test_for_slowly_mined_blocks():
last_block = Block.mine_the_block(Block.genesis_block_generator(), 'foo')
time.sleep(MINE_RATE / SECS)
mined_block = Block.mine_the_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty - 1
def test_for_quickly_mined_blocks():
last_block = Block.mine_the_block(Block.genesis_block_generator(), 'foo')
mined_block = Block.mine_the_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty + 1
def test_for_genesis_generation():
genesis = Block.genesis_block_generator()
assert isinstance(genesis, Block)
for key, value in THE_GENESIS_BLOCK_DATA.items():
getattr(genesis, key) == value
def __init__(self):
self.chain = [Block.genesis_block_generator()]
