from streamlit.testing.v1 import AppTest
from unittest.mock import patch
from typing import Any

# Path to the ui.py file
UI_FILE = "src/meridian/ui.py"


def test_ui_file_not_found(tmp_path: Any) -> None:
    # This test will simulate the UI_FILE not existing
    # by temporarily changing the UI_FILE path to a non-existent one.
    non_existent_path = tmp_path / "non_existent_ui.py"

    with patch("src.meridian.ui.UI_FILE", str(non_existent_path)):
        # AppTest.from_file expects the file to exist, so we need to mock its behavior
        # or catch the expected FileNotFoundError.
        # For now, we'll just ensure the path is set correctly for the test.
        # A more complete test would involve mocking the file system or catching the error.
        pass  # Placeholder for actual test logic


def test_ui_loads_no_args() -> None:
    at = AppTest.from_file(UI_FILE)
    at.run()
    # Just verify it doesn't crash.
    # Argument parsing behavior in AppTest properties vary by environment.
    assert not at.exception
