tests/test_runtime_environment.py

import os

from runtime_environment import load_runtime_environment


def test_dotenv_values_override_existing_environment(monkeypatch, tmp_path):
    monkeypatch.delenv("PYTHON_DOTENV_DISABLED", raising=False)
    dotenv_path = tmp_path / "runtime.env"
    dotenv_path.write_text(
        "OPENAI_BASE_URL=https://dotenv.example/v1\n"
        "OPENAI_MODEL_NAME=dotenv-model\n",
        encoding="utf-8",
    )
    monkeypatch.setenv("OPENAI_BASE_URL", "https://process.example/v1")
    monkeypatch.setenv("OPENAI_MODEL_NAME", "process-model")

    assert load_runtime_environment(dotenv_path) is True
    assert os.environ["OPENAI_BASE_URL"] == "https://dotenv.example/v1"
    assert os.environ["OPENAI_MODEL_NAME"] == "dotenv-model"