default_response_class=ResponseLevel1,
    callbacks=callback_router1.routes,
)

app.include_router(router2_override)

app.include_router(router2_default)

client = TestClient(app)


def test_level1_override():
    response = client.get("/override1?level1=foo")
    assert response.json() == "foo"
    assert response.headers["content-type"] == "application/x-level-1"
    assert "x-level0" in response.headers

* ⬆ [pre-commit.ci] pre-commit autoupdate. PR [#5196](https://github.com/tiangolo/fastapi/pull/5196) by [@pre-commit-ci[bot]](https://github.com/apps/pre-commit-ci).
* 🔥 Delete duplicated tests in `tests/test_tutorial/test_sql_databases/test_sql_databases.py`. PR [#5040](https://github.com/tiangolo/fastapi/pull/5040) by [@raccoonyy](https://github.com/raccoonyy).