File "diskcache/core.py", line 623, in _con
    con = self._local.con = sqlite3.connect(

from key_value.aio.stores.memory import MemoryStore

async def test_callback_error_returns_html_page(self):
    """Test that OAuth callback errors return styled HTML instead of data: URLs."""
    from unittest.mock import Mock

    from starlette.requests import Request
    from starlette.responses import HTMLResponse

    from fastmcp.server.auth.oauth_proxy import OAuthProxy
    from fastmcp.server.auth.providers.jwt import JWTVerifier

    # Create a minimal OAuth proxy with isolated storage
    provider = OAuthProxy(
        upstream_authorization_endpoint="https://idp.example.com/authorize",
        upstream_token_endpoint="https://idp.example.com/token",
        upstream_client_id="test-client",
        upstream_client_secret="test-secret",
        token_verifier=JWTVerifier(
            jwks_uri="https://idp.example.com/.well-known/jwks.json",
            issuer="https://idp.example.com",
            audience="test-client",
        ),
        base_url="http://localhost:8000",
        jwt_signing_key="test-signing-key",
        client_storage=MemoryStore(),  # Add this line
    )
    # ... rest of test