"""Source-level guard for a GUI callback regression that occurred before first frame."""
from pathlib import Path


def test_runtime_callback_does_not_reference_screenshot_path() -> None:
    source = (Path(__file__).parents[1] / "src" / "application.py").read_text(encoding="utf-8")
    callback_body = source.split("def _emit_runtime_update", 1)[1]
    assert "Saved screenshot" not in callback_body
    screenshot_body = source.split("def _save_screenshot", 1)[1].split("def _emit_runtime_update", 1)[0]
    assert 'LOGGER.info("Saved screenshot: %s", path)' in screenshot_body