def test_reset_approval(self, token_client, token_wallet_client):
# Start with some spending money from the token wallet
assert token_client.balance_of(token_client.address) == 0
token_wallet_client.transfer(token_client.address, 12345 * 2)
assert token_client.balance_of(token_client.address) == 24690
# Approve a client to spend up to 12345
approved_address = token_client.w3.eth.accounts[1]
token_client.approve(approved_address, 12345)
assert token_client.allowance(token_client.address,
approved_address) == 12345
# Client spends some money, allowance goes down
client = DeviseToken(private_key=TEST_KEYS[1])
client.transfer_from(token_client.address, client.address, 12340)
assert token_client.allowance(token_client.address,
approved_address) == 5
# client has insufficient allowance
with raises(AssertionError):
client.transfer_from(token_client.address, client.address, 10)
# reset client allowance
token_client.approve(approved_address, 12345)
assert token_client.allowance(token_client.address,
approved_address) == 12345
client.transfer_from(token_client.address, client.address, 100)
assert token_client.allowance(token_client.address,
approved_address) == 12245
def token_client():
"""Devise Client fixture created using an account's private key"""
client = DeviseToken(private_key=TEST_KEYS[0])
net_id = client.w3.version.network
if net_id == "1":
raise RuntimeError("Cowardly refusing to run tests against MainNet!!")
return client
def test_transfer_from(self, token_wallet_client, token_client):
# Start with some spending money from the token wallet
assert token_client.balance_of(token_client.address) == 0
token_wallet_client.transfer(token_client.address, 12345)
assert token_client.balance_of(token_client.address) == 12345
approved_address = token_client.w3.eth.accounts[1]
token_client.approve(approved_address, 12345)
approved_client = DeviseToken(private_key=TEST_KEYS[1])
approved_client.transfer_from(token_client.address, approved_address,
12345)
assert token_client.balance_of(approved_address) == 12345
assert token_client.allowance(token_client.address,
approved_address) == 0
# Reached allowance, should fail
with raises(Exception):
approved_client.transfer_from(token_client.address,
approved_address, 1)