def test_if_jumped_difficulty_in_block_is_valid(last_block, block):
jumped_difficulty = 10
block.difficulty = jumped_difficulty
block.hash = f'{"0" * jumped_difficulty}111abc'
with pytest.raises(Exception, match='Block Difficulty Can Only Be Adjusted by 1'):
Block.block_is_valid(last_block, block)
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 test_if_bad_block_hash_in_block_is_valid(last_block, block): block.hash = '0000000000000000bacabc' with pytest.raises(Exception, match='Block Hash Must be Correct'): Block.block_is_valid(last_block, block)
def test_if_bad_proof_of_work_in_block_is_valid(last_block, block):
block.hash = 'fff'
with pytest.raises(Exception, match='`Proof of Work` Requirement has not Been Met'):
Block.block_is_valid(last_block, block)
def test_if_bad_last_hash_in_block_is_valid(last_block, block):
block.last_hash = 'bad_last_hash'
with pytest.raises(Exception, match='`last_hash` Must be Correct'):
Block.block_is_valid(last_block, block)
def test_if_block_is_valid(last_block, block):
Block.block_is_valid(last_block, block)
