import re


def test_service_worker_serves_assets(client):
    resp = client.get("/service-worker.js")
    assert resp.status_code == 200
    text = resp.get_data(as_text=True)
    # Ensure JS content type and presence of cache list with known asset
    assert "application/javascript" in (resp.headers.get("Content-Type") or "")
    assert "dist/output.css" in text
    assert "enhanced-ui.js" in text
    # Basic sanity: ASSETS array present
    assert "const ASSETS=" in text