The FullMath.spec.ts file contains two identical test cases.，
it('reverts if output overflows uint256', async () => {
await expect(fullMath.mulDiv(Q128, Q128, 1)).to.be.reverted
})
it('reverts if output overflows uint256', async () => {
await expect(fullMath.mulDiv(Q128, Q128, 1)).to.be.reverted
})