"""Envelope tests for fetch command."""
from __future__ import annotations
import json
import pytest
from tests.cli_test_helper import CliRunner

runner = CliRunner()

_FIELDS = ("muse_version", "schema", "timestamp", "warnings")


def _check(d: dict) -> None:
    for f in _FIELDS:
        assert f in d, f"missing {f}"
    assert "schema_version" not in d


class TestFetchEnvelope:
    def test_fetch_no_remote_has_envelope(self):
        # fetch with an unconfigured remote exits non-zero but still emits JSON envelope
        r = runner.invoke(None, ["fetch", "nonexistent_remote_xyz", "--json"])
        assert r.exit_code != 0
        # runner captures stdout + stderr; first line is the JSON envelope
        _check(json.loads(r.output.splitlines()[0]))