import os
from gravityweave.mfr_v2 import MutualFeasibilityReceiptV2


def test_mfr_v2_sign_and_size():
    key = b"test-key-12345"
    proposal_hash = "abcd1234"
    invariants = [1, 2, 7]
    m = MutualFeasibilityReceiptV2.create(
        proposal_hash=proposal_hash,
        invariant_id_set=invariants,
        decision="ok",
        uncertainty_pct=5,
        round_nonce=42,
        pass_ticket_hash="",
        execution_hash_skim="deadbeef",
        signer="node-A",
        key=key,
    )

    assert m.verify(key)
    s = m.serialize()
    # ensure size is small (<= 512 bytes as requested by spec)
    assert len(s) <= 512

    # roundtrip
    m2 = MutualFeasibilityReceiptV2.deserialize(s)
    assert m2.proposal_hash == proposal_hash
    assert m2.invariant_id_set == invariants