def test_slowly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'foo')
time.sleep(
MINE_RATE / SECONDS
) # Delay to ensure it is mined slower than mine_rate, takes argument in second
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty - 1
def test_genesis():
genesis = Block.genesis()
assert isinstance(genesis, Block)
for key, value in GENESIS_DATA.items():
getattr(
genesis, key
) == value # Checks if all values of genesis object are same as that in original dictionary
def test_mine_block():
last_block = Block.genesis()
data = 'test-data'
block = Block.mine_block(last_block, data)
assert isinstance(
block, Block
) # Check if the block we created became an instance or object of Block class
assert block.data == data
assert block.last_hash == last_block.hash
assert hex_to_binary(
block.hash)[0:block.difficulty] == '0' * block.difficulty
def is_valid_chain(chain):
'''
Validate the blockchain using following rules
- chain must start with genesis block
- blocks must be formatted correctly
'''
if chain[0].__dict__ != Block.genesis(
).__dict__: # Python can't check equality of two objects, but dictionaries
raise Exception('The genesis block must be valid')
for i in range(1, len(chain)):
block = chain[i]
last_block = chain[i - 1]
Block.is_valid_block(last_block, block)
def last_block():
return Block.genesis()
def test_quickly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'foo')
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty + 1
def __init__(self):
self.chain = [Block.genesis()]