question: beacon hash = 0x00..00 is implicit about execution-spec-tests

[marioevz]

Parent Beacon Root is not part of the state tests, because this is a block behavior, it happens at the start of the block, and the purpose of the state test is to evaluate a single tx state transition.

In tests where they are written with a beacon root contract interaction in mind, the env still does not have any reference to the beacon root, and the beacon root storage in the pre is already filled with the information:

{
    "tests/cancun/eip4788_beacon_root/test_beacon_root_contract.py::test_calldata_lengths[fork_Cancun-state_test-timestamp_12-valid_call_False-valid_input_False-1024_bytes]": {
        "_info": {
            "comment": "`execution-spec-tests` generated test",
            "filling-transition-tool": "evm version 1.13.9-unstable-0b471c31",
            "reference-spec": "https://github.com/ethereum/EIPs/blob/master/EIPS/eip-4788.md",
            "reference-spec-version": "e7608fe8ac8a60934ca874f5aab7d5c1f4ff7782"
        },
        "env": {
            "currentCoinbase": "0x2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
            "currentGasLimit": "0x016345785d8a0000",
            "currentNumber": "0x01",
            "currentTimestamp": "0x0c",
            "currentRandom": "0x0000000000000000000000000000000000000000000000000000000000000000",
            "currentDifficulty": "0x00",
            "currentBaseFee": "0x07",
            "currentExcessBlobGas": "0x00"
        },
        "pre": {
            "0x000f3df6d732807ef1319fb7b8bb8522d0beac02": {
                "nonce": "0x01",
                "balance": "0x00",
                "code": "0x3373fffffffffffffffffffffffffffffffffffffffe14604d57602036146024575f5ffd5b5f35801560495762001fff810690815414603c575f5ffd5b62001fff01545f5260205ff35b5f5ffd5b62001fff42064281555f359062001fff015500",
                "storage": {
                    "0x0c": "0x0c",   <= This part
                    "0x200b": "0x6c31fc15422ebad28aaf9089c306702f67540b53c7eea8b7d2941044b027100f"   <= And this part
                }
            },

If you really want to, you can parse this storage, it will always have the correct info:
0x0c is equal to currentTimestamp, and the parent beacon root, 0x6c31fc15422ebad28aaf9089c306702f67540b53c7eea8b7d2941044b027100f in this case, is at 0x0c + 0x1fff, where 0x1fff is the HISTORY_BUFFER_LENGTH constant in the EIP.