def test_erc20_interface(token: Contract, token_owner: str, empty_address: str):
"""Token satisfies ERC-20 interface."""
# https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/ERC20.sol
assert token.call().balanceOf(empty_address) == 0
assert token.call().allowance(token_owner, empty_address) == 0
# Event
# We follow OpenZeppelin - in the ERO20 issue names are _from, _to, _value
transfer = token._find_matching_event_abi("Transfer", ["from", "to", "value"])
assert transfer
approval = token._find_matching_event_abi("Approval", ["owner", "spender", "value"])
assert approval
def test_erc20_interface(token: Contract, token_owner: str,
empty_address: str):
"""Token satisfies ERC-20 interface."""
# https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/ERC20.sol
assert token.functions.balanceOf(empty_address).call() == 0
assert token.functions.allowance(token_owner, empty_address).call() == 0
# Event
# We follow OpenZeppelin - in the ERO20 issue names are _from, _to, _value
transfer = token._find_matching_event_abi("Transfer",
["from", "to", "value"])
assert transfer
approval = token._find_matching_event_abi("Approval",
["owner", "spender", "value"])
assert approval
def event_data(contract: Contract, tx, event_name):
"""
Extract the specified event from a transaction.
:param contract: The Web3 Contract object
:type contract: Contract
:param event_name:
:param tx:
:return:
"""
receipt = contract.web3.eth.getTransactionReceipt(tx)
data = None
for log_entry in receipt['logs']:
try:
event_abi = contract._find_matching_event_abi(event_name)
data = get_event_data(event_abi, log_entry)
except MismatchedABI:
pass
if not data:
raise ValueError('event not found {}'.format(event_name))
return data
