import os
from pathlib import Path

from dotenv import load_dotenv


def test_dotenv_loads_missing_environment_value(tmp_path: Path, monkeypatch) -> None:
    env_file = tmp_path / ".env"
    env_file.write_text("CLOUD_PROJECT_ID=project-from-file\n")
    monkeypatch.delenv("CLOUD_PROJECT_ID", raising=False)

    assert load_dotenv(env_file) is True
    assert os.environ["CLOUD_PROJECT_ID"] == "project-from-file"


def test_dotenv_does_not_override_shell_environment(tmp_path: Path, monkeypatch) -> None:
    env_file = tmp_path / ".env"
    env_file.write_text("CLOUD_PROJECT_ID=project-from-file\n")
    monkeypatch.setenv("CLOUD_PROJECT_ID", "project-from-shell")

    load_dotenv(env_file)

    assert os.environ["CLOUD_PROJECT_ID"] == "project-from-shell"