blockchain-python/blockchain_test.py at main · gudj0/blockchain-python · GitHub

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from block import Block
from blockchain import Blockchain
import uuid

BLOCK_SIZE = 25

# tests the functionality of the Blockchain.add_block() and validate_block() function
def test_add_block(bc, alice, bob):

    # should not allow a lower or equal block number to the last block
    b = Block(BLOCK_SIZE)
    b.num = bc.current_block - 1
    alice_init = bc.get_balance(alice)
    new_address = uuid.uuid4().hex
    b.tx(new_address, alice)
    res = bc.add_block(b)
    assert res == False, "Should not allow a lower or equal block number to the last block"

    # block without a valid previous block should not be added
    b = Block(BLOCK_SIZE)
    b.num = bc.current_block + 2
    bob_init = bc.get_balance(bob)
    new_address = uuid.uuid4().hex
    b.tx(new_address, bob)
    res = bc.add_block(b)
    assert res == False, "Block with a >1 higher block number should not be added"

    # should not allow null type to be added as Block
    b = None
    res = bc.add_block(b)
    assert res == False, "Should not allow null type to be added as Block"


    # should not allow invalid object type to be added as Block
    b = Blockchain()
    res = bc.add_block(b)
    assert res == False, "Should not allow Blockchain type to be added as Block"

     # tx from empty balance should fail
    b = Block(BLOCK_SIZE)
    alice_init = bc.get_balance(alice)
    new_address = uuid.uuid4().hex
    b.tx(new_address, alice)
    bc.add_block(b)
    assert bc.get_balance(alice) == alice_init, "Tx from sender with zero-balance should not change chain's state"


# tests the functionality of the Blockchain.update_state() function
def test_update_state(bc, bob, alice):
    # populate addresses with some cash through faucet
    bc.faucet(bob)
    bc.faucet(alice)


    # tx from empty balance should fail
    b = Block(BLOCK_SIZE)
    alice_init = bc.get_balance(alice)
    new_address = uuid.uuid4().hex
    b.tx(new_address, alice)
    bc.add_block(b)
    assert bc.get_balance(alice) == alice_init, "Tx from sender with zero-balance should not change chain's state"


    # blockchain state should initialize any new address to 0
    b = Block(BLOCK_SIZE)
    alice_init = bc.get_balance(alice)
    new_address = uuid.uuid4().hex
    b.tx(alice, new_address)
    bc.add_block(b)
    assert bc.state[new_address] != None , "Blockchain state should initialize any new address to 0"


if __name__=="__main__":

    # init blockchain and genesis block
    bc = Blockchain()
    g = Block(BLOCK_SIZE)

    # init addresses
    bob = uuid.uuid4().hex
    alice = uuid.uuid4().hex

    # test functions
    test_update_state(bc, bob, alice)
    test_add_block(bc, bob, alice)