swapTokensForExactETH

function swapTokensForExactETH(
    uint _amountOut, 
    uint _amountInMax, 
    address[] calldata _path, 
    address _to, 
    uint _deadline
) external virtual ensure(_deadline) returns (uint[] memory amounts)

// 토큰 거래에 대한 허용
await mockToken0Contract.approve(routerContract.address, MaxUint256)

// swap
await swapRouterContract.swapTokensForExactETH(
    5000,
    MaxUint256,
    [mockToken0Contract.address, WMATICContract.address],
    accounts[0].address,
    MaxUint256,
    overrides
)