def test_isValidBlockJumpDifficulty(lastBlock, block):
jump_difficulty = 10
block.difficulty = jump_difficulty
block.__hash__ = f'{"0" * jump_difficulty}111abbc'
with pytest.raises(Exception,match='difficulty change is more than 1'):
Block.isValidBlock(lastBlock, block)
def isValidLedger(ledger):
'''
validate the ledger
'''
if ledger[0] != Block.genesisBlock():
raise Exception('genesis block must be valid')
for i in range(1, len(ledger)):
block = ledger[i]
lastBlock = ledger[i - 1]
Block.isValidBlock(lastBlock, block)
def test_isValidBlockBadHash(lastBlock, block):
block.hash = '0000000000000000000000000bbabc'
with pytest.raises(Exception,match='Hash does not match'):
Block.isValidBlock(lastBlock, block)
def test_isValidBlockBadProofOfWork(lastBlock, block):
block.hash = 'bad_hash'
with pytest.raises(Exception,match='Proof of work mismatch'):
Block.isValidBlock(lastBlock, block)
def test_isValidBlockBadLastHash(lastBlock, block):
block.previousHash = 'bad_hash'
with pytest.raises(Exception,match='previous hash of this block\
does not match with hash of previous block'):
Block.isValidBlock(lastBlock, block)
def test_isValidBlock(lastBlock, block):
Block.isValidBlock(lastBlock, block)
