How to deal when testing with eth brownie for a sender with not enough balance - brownie

Question

I'm trying in my tests to simulate a situation where a sender calls a payable method of a contract but does not have enough balance.
A sample code would be:
with brownie.reverts():
contract.buy({'from': accounts[0], 'value': 100000000000000000000000000})
Instead of the test continuing I get a ValueError:
E ValueError: sender doesn't have enough funds to send tx. The upfront cost is: 100000000000000000000000000 and the sender's account only has: 100000000000000000000
How do I catch such errors with brownie?

Answer 1

You try to send more eth than is on account balance. If you use use ganache-cli the initial balance of each account is 100 eth. You can create account of bigger balance by collecting all eth into single account, as follow:
Create following brownie-config.yaml:
networks:
default: development
development:
cmd_settings:
accounts: 50
where you can change 50 to your desired number. Then create script.py file in scripts/ directory with following code:
from brownie import accounts, Wei
def main():
print('initial number of accounts ', len(accounts))
balance = accounts[0].balance()
print('initial balance of account_0 in Eth ', Wei(balance).to('ether'))
# transfer all eth into account_0
for i in range(1, len(accounts)):
amount = accounts[i].balance()
accounts[i].transfer(accounts[0], amount)
balance = accounts[0].balance()
print('final balance of account_0 in Eth ', Wei(balance).to('ether'))
Run:
brownie run scripts/script.py
to check final balance of accounts[0] EOA
Warning: It loops over all accounts and make transfer for each of them, so for big accounts number script can run really slow