"""Envelope tests for code coverage command."""
from __future__ import annotations
from collections.abc import Mapping
import json
import pytest
from tests.cli_test_helper import CliRunner

runner = CliRunner()

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


def _check(d: Mapping[str, object]) -> None:
    for f in _FIELDS:
        assert f in d, f"missing {f}"
    assert "schema_version" not in d


class TestCoverageEnvelope:
    def test_coverage_has_envelope(self) -> None:
        r = runner.invoke(None, ["code", "coverage", "muse/core/errors.py::MuseCLIError", "--json"])
        assert r.exit_code == 0, r.output
        _check(json.loads(r.output))