def test_mine_block():
last_block=Block.genesis()
data='test-data'
block=Block.mine_block(last_block,data)
assert isinstance(block,Block)
assert block.data==data
assert block.last_hash==last_block.hash
assert hex_to_binary(block.hash)[0:block.difficulty] == '0'*block.difficulty
def test_mined_block_difficulty_limits_at_1():
last_block= Block(
time.time(),
'test_last_hash',
'test_hash',
'test_data',
1,
0
)
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'hola2')
assert mined_block.difficulty==1
def is_valid_chain(chain):
"""
Validate de incoming chain.
Enforce the following rules of the blokchain:
-the chain must start with genesis block
-block must be formatted correctly
"""
if chain[0] != Block.genesis():
raise Exception('the genesis block must be invalid')
for i in range(1, len(chain)):
block = chain[i]
last_block = chain[i - 1]
Block.is_valid_block(last_block, block)
def test_genesis():
genesis=Block.genesis()
assert isinstance(genesis, Block)
assert genesis.timestamp==GENESIS_DATA['timestamp']
assert genesis.last_hash == GENESIS_DATA['last_hash']
assert genesis.hash == GENESIS_DATA['hash']
assert genesis.data == GENESIS_DATA['data']
for key,value in GENESIS_DATA.items():
getattr(genesis,key) == value
def test_is_valid_block_bad_block_hash(last_block,block):
block.hash='00000000000000000000abbbc'
with pytest.raises(Exception, match='The block difficulty must be incorrect'):
Block.is_valid_block(last_block, block)
def test_is_valid_block_jumped_difficulty(last_block,block):
jumped_difficulty=10
block.difficulty=jumped_difficulty
block.hash=f'{"0"*jumped_difficulty}111abc'
with pytest.raises(Exception, match='The block hash must only adjust by 1'):
Block.is_valid_block(last_block, block)
def test_is_valid_bad_proof_of_work(last_block,block):
block.hash='ffff'
with pytest.raises(Exception, match='The proof of requeriment was not meet'):
Block.is_valid_block(last_block, block)
def test_is_valid_block_bad_last_hash(last_block,block):
block.last_hash='bad-lash-hash'
with pytest.raises(Exception,match='The block last_hash must be incorrect'):
Block.is_valid_block(last_block,block)
def test_is_valid_block(last_block,block):
Block.is_valid_block(last_block,block)
def block(last_block):
return Block.mine_block(last_block,'test-data')
def last_block():
return Block.genesis()
def test_slowly_mined_block():
last_block=Block.mine_block(Block.genesis(),'hola')
time.sleep(MINE_RATE/SECONDS)
mined_block=Block.mine_block(last_block,'hola2')
assert mined_block.difficulty==last_block.difficulty-1
def test_quickly_mined_block():
last_block=Block.mine_block(Block.genesis(),'hola')
mined_block=Block.mine_block(last_block,'hola2')
assert mined_block.difficulty==last_block.difficulty+1
def add_block(self, data):
#last_block = self.chain[-1] #el ultimo bloque
self.chain.append(Block.mine_block(self.chain[-1], data))
def __init__(self):
self.chain = [Block.genesis()] #agrega el bloque genesis