js/app/test/input_output.spec.ts

import { test, expect } from "@gradio/tootils";

test("a component acts as both input and output", async ({ page }) => {
	const textbox = await page.getByLabel("Input-Output");

	await textbox.fill("test");
	await page.click("button");
	await expect(await textbox).toHaveValue("tset");
});