def blockchain_three_blocks():
blockchain = Blockchain()
for i in range(3):
blockchain.addBlock(i)
return blockchain
def test_add_block():
blockchain=Blockchain()
data='test-data'
blockchain.addBlock(data)
assert blockchain.ledger[-1].data==data
def test_add_single_block(self):
blockchain = Blockchain()
blockchain.addBlock(["aaa"])
self.assertEqual(len(blockchain.chain), 2)