strategy_balance = strategy.functions.balanceOf().call()
controller.functions.setCap(vault.address, strategy.address, strategy_balance - 1, dai.address).transact()

## this would be reverted
vault.functions.withdrawAll(dai.address).transact()
uint previousBalance = IStrategy(_strategy).balanceOf();
_vaultDetails[_vault].balance.sub(previousBalance.sub(_amount));
