test: add decoding test

[mattsse]

@DaniPopes we're unable to decode the revert reason for the output of this trace:

{
	"jsonrpc":"2.0",
	"method":"debug_traceTransaction",
	"params":["0x105707c8e3b3675a8424a7b0820b271cbe394eaf4d5065b03c273298e3a81314", {  "tracer": "callTracer" }],
	"id":1
}

            {
                "from": "0x8ba8ceecdcb00bee67a0e9acc0c23f4ef433857e",
                "gas": "0x6d706",
                "gasUsed": "0x463d2",
                "to": "0xf848e97469538830b0b147152524184a255b9106",
                "input": "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",
                "output": "0x08c379a000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000024556e697377617056323a20494e53554646494349454e545f494e5055545f414d4f554e5400000000000000000000000000000000000000000000000000000080",
                "error": "Reverted",

erigon decodes the reason

           {
                "output": "0x08c379a000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000024556e697377617056323a20494e53554646494349454e545f494e5055545f414d4f554e5400000000000000000000000000000000000000000000000000000080",
                "error": "execution reverted",
                "revertReason": "UniswapV2: INSUFFICIENT_INPUT_AMOUNT",

looks the like output has a few extra bytes, any ideas?

[mattsse]

bump @DaniPopes any ideas?

[DaniPopes]

Don't know, I'm not well versed in Solidity 0.5 invalid ABI encoding :)

08c379a0                                                         // keccak256("Error(string)")[..4]
0000000000000000000000000000000000000000000000000000000000000020 // offset = 32 (next word)
0000000000000000000000000000000000000000000000000000000000000024 // length = 36
556e697377617056323a20494e53554646494349454e545f494e5055545f414d // string[ 0..32]
4f554e54                                                         // string[32..36]
00000000000000000000000000000000000000000000000000000080         // ?

The error is this not the one you linked: https://github.com/Uniswap/v2-core/blob/ee547b17853e71ed4e0101ccfd52e70d5acded58/contracts/UniswapV2Pair.sol#L178

In this case it gets decoded correctly but fails validation because encode(decoded) != data due to the random 80 byte at the end of the string padding. You can pass false to abi decoding to skip this validation @mattsse: alloy-rs/core#511

[DaniPopes]

Fixed in next release of alloy-core