import json
from idea165_commonsgrid_community_managed.governance import GovernanceLedger


def test_governance_ledger_basic():
    gl = GovernanceLedger(quorum=2)
    b1 = gl.append_block("policy_v1", {"alice": "sig1", "bob": "sig2"})
    assert b1.version == 1
    assert gl.last_block().block_hash == b1.block_hash
    assert gl.verify_chain() is True

    # Tamper check: change block and verify invalid hash is detected
    b2 = gl.append_block("policy_v2", {"alice": "sig3", "bob": "sig4"})
    assert gl.verify_chain() is True