def test_resets_current_transactions_when_mined():
bc = Blockchain()
bc.new_transaction('a', 'b', 1)
initial_length = len(bc.current_transactions)
bc.new_block(123, 'abc')
current_length = len(bc.current_transactions)
assert initial_length == 1
assert current_length == 0
def test_block_creation(a_valid_block, proof=123, previous_hash='abc'):
bc = Blockchain()
block_a_tester = bc.new_block(proof, previous_hash)
assert block_a_tester['index'] == a_valid_block['index']
assert isinstance(block_a_tester['timestamp'],
type(a_valid_block['timestamp']))
assert block_a_tester['proof'] == a_valid_block['proof']
assert block_a_tester['previous_hash'] == a_valid_block['previous_hash']