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test(manifest): pin bidirectional COSE version negotiation (#315) #122

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Merged
imran-siddique merged 1 commit into from
Aug 19, 2026
Merged

test(manifest): pin bidirectional COSE version negotiation (#315) #122

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19 changes: 19 additions & 0 deletions tests/unit/test_agent_manifest_cose.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@

import agent_manifest as sdk
import pytest
from agent_manifest import _cose as sdk_cose

from ca2a_runtime.agent_manifest import (
load_agent_manifest_document,
Expand Down Expand Up @@ -105,6 +106,24 @@ def test_v02_bare_json_is_rejected(tmp_path: Path) -> None:
load_agent_manifest_document(path)


def test_v01_payload_inside_v02_envelope_is_rejected(
tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
"""AM-VEC-COSE-012 through cA2A's own startup loader."""
keypair = sdk.generate_ed25519()
manifest = _manifest("0.1")
manifest["@context"] = "https://agentmanifest.agentrust-io.com/v0.1/context.json"

# Bypass only the producer guard to construct the adversarial signed wire
# artifact. The consumer decoder and verifier remain unmodified.
monkeypatch.setattr(sdk_cose, "_require_v02", lambda _manifest: None)
path = tmp_path / "v01-in-v02.cose"
path.write_bytes(sdk.sign_manifest_cose(manifest, keypair))

with pytest.raises(ConfigError, match="payload declares manifest version 0.1"):
load_agent_manifest_document(path)


def test_tampered_cose_is_rejected(tmp_path: Path) -> None:
envelope, _manifest_doc, key_id, public_key = _cose()
tampered = bytearray(envelope)
Expand Down