"""Envelope tests for branch 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 TestBranchEnvelope:
    def test_list_has_envelope(self):
        r = runner.invoke(None, ["branch", "--json"])
        assert r.exit_code == 0, r.output
        d = json.loads(r.output)
        _check(d)
        assert "branches" in d