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import hashlib
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import json
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from unittest import TestCase
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from blockchain import Blockchain
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class BlockchainTestCase(TestCase):
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def setUp(self):
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self.blockchain = Blockchain()
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def create_block(self, proof=123, previous_hash='abc'):
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self.blockchain.new_block(proof, previous_hash)
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def create_transaction(self, sender='a', recipient='b', amount=1):
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self.blockchain.new_transaction(
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sender=sender,
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recipient=recipient,
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amount=amount
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)
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class TestRegisterNodes(BlockchainTestCase):
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def test_valid_nodes(self):
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blockchain = Blockchain()
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blockchain.register_node('http://192.168.0.1:5000')
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self.assertIn('192.168.0.1:5000', blockchain.nodes)
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def test_malformed_nodes(self):
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blockchain = Blockchain()
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blockchain.register_node('http//192.168.0.1:5000')
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self.assertNotIn('192.168.0.1:5000', blockchain.nodes)
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def test_idempotency(self):
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blockchain = Blockchain()
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blockchain.register_node('http://192.168.0.1:5000')
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blockchain.register_node('http://192.168.0.1:5000')
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assert len(blockchain.nodes) == 1
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class TestBlocksAndTransactions(BlockchainTestCase):
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def test_block_creation(self):
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self.create_block()
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latest_block = self.blockchain.last_block
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# The genesis block is create at initialization, so the length should be 2
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assert len(self.blockchain.chain) == 2
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assert latest_block['index'] == 2
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assert latest_block['timestamp'] is not None
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assert latest_block['proof'] == 123
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assert latest_block['previous_hash'] == 'abc'
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def test_create_transaction(self):
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self.create_transaction()
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transaction = self.blockchain.current_transactions[-1]
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assert transaction
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assert transaction['sender'] == 'a'
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assert transaction['recipient'] == 'b'
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assert transaction['amount'] == 1
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def test_block_resets_transactions(self):
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self.create_transaction()
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initial_length = len(self.blockchain.current_transactions)
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self.create_block()
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current_length = len(self.blockchain.current_transactions)
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assert initial_length == 1
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assert current_length == 0
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def test_return_last_block(self):
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self.create_block()
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created_block = self.blockchain.last_block
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assert len(self.blockchain.chain) == 2
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assert created_block is self.blockchain.chain[-1]
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class TestHashingAndProofs(BlockchainTestCase):
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def test_hash_is_correct(self):
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self.create_block()
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new_block = self.blockchain.last_block
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new_block_json = json.dumps(self.blockchain.last_block, sort_keys=True).encode()
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new_hash = hashlib.sha256(new_block_json).hexdigest()
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assert len(new_hash) == 64
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assert new_hash == self.blockchain.hash(new_block)
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