test: add client-only e2e test

packages/astro/e2e/client-only.test.js

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+import { test as base, expect } from '@playwright/test';
+import { loadFixture } from './test-utils.js';
+
+const test = base.extend({
+	astro: async ({}, use) => {
+		const fixture = await loadFixture({ root: './fixtures/client-only/' });
+		await use(fixture);
+	},
+});
+
+let devServer;
+
+test.beforeEach(async ({ astro }) => {
+	devServer = await astro.startDevServer();
+});
+
+test.afterEach(async () => {
+	await devServer.stop();
+});
+
+test.describe('Client only', () => {
+	test('React counter', async ({ astro, page }) => {
+		await page.goto('/');
+
+		const counter = await page.locator('#react-counter');
+		await expect(counter, 'component is visible').toBeVisible();
+
+		const count = await counter.locator('pre');
+		await expect(count, 'initial count is 0').toHaveText('0');
+
+		const children = await counter.locator('h1');
+		await expect(children, 'children exist').toHaveText('react');
+
+		const increment = await counter.locator('.increment');
+		await increment.click();
+
+		await expect(count, 'count incremented by 1').toHaveText('1');
+	});
+
+	test('Preact counter', async ({ astro, page }) => {
+		await page.goto('/');
+
+		const counter = await page.locator('#preact-counter');
+		await expect(counter, 'component is visible').toBeVisible();
+
+		const count = await counter.locator('pre');
+		await expect(count, 'initial count is 0').toHaveText('0');
+
+		const children = await counter.locator('h1');
+		await expect(children, 'children exist').toHaveText('preact');
+
+		const increment = await counter.locator('.increment');
+		await increment.click();
+
+		await expect(count, 'count incremented by 1').toHaveText('1');
+	});
+
+	test('Solid counter', async ({ astro, page }) => {
+		await page.goto('/');
+
+		const counter = await page.locator('#solid-counter');
+		await expect(counter, 'component is visible').toBeVisible();
+
+		const count = await counter.locator('pre');
+		await expect(count, 'initial count is 0').toHaveText('0');
+
+		const children = await counter.locator('h1');
+		await expect(children, 'children exist').toHaveText('solid');
+
+		const increment = await counter.locator('.increment');
+		await increment.click();
+
+		await expect(count, 'count incremented by 1').toHaveText('1');
+	});
+
+	test('Vue counter', async ({ astro, page }) => {
+		await page.goto('/');
+
+		const counter = await page.locator('#vue-counter');
+		await expect(counter, 'component is visible').toBeVisible();
+
+		const count = await counter.locator('pre');
+		await expect(count, 'initial count is 0').toHaveText('0');
+
+		const children = await counter.locator('h1');
+		await expect(children, 'children exist').toHaveText('vue');
+
+		const increment = await counter.locator('.increment');
+		await increment.click();
+
+		await expect(count, 'count incremented by 1').toHaveText('1');
+	});
+
+	test('Svelte counter', async ({ astro, page }) => {
+		await page.goto('/');
+
+		const counter = await page.locator('#svelte-counter');
+		await expect(counter, 'component is visible').toBeVisible();
+
+		const count = await counter.locator('pre');
+		await expect(count, 'initial count is 0').toHaveText('0');
+
+		const children = await counter.locator('h1');
+		await expect(children, 'children exist').toHaveText('svelte');
+
+		const increment = await counter.locator('.increment');
+		await increment.click();
+
+		await expect(count, 'count incremented by 1').toHaveText('1');
+	});
+});

packages/astro/e2e/fixtures/client-only/astro.config.mjs

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+import { defineConfig } from 'astro/config';
+import preact from '@astrojs/preact';
+import react from '@astrojs/react';
+import svelte from '@astrojs/svelte';
+import vue from '@astrojs/vue';
+import solid from '@astrojs/solid-js';
+
+// https://astro.build/config
+export default defineConfig({
+	// Enable many frameworks to support all different kinds of components.
+	integrations: [preact(), react(), svelte(), vue(), solid()],
+});

packages/astro/e2e/fixtures/client-only/package.json

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+{
+  "name": "@e2e/multiple-frameworks",
+  "version": "0.0.0",
+  "private": true,
+  "devDependencies": {
+    "@astrojs/lit": "^0.1.3",
+    "@astrojs/preact": "^0.1.2",
+    "@astrojs/react": "^0.1.2",
+    "@astrojs/solid-js": "^0.1.2",
+    "@astrojs/svelte": "^0.1.3",
+    "@astrojs/vue": "^0.1.4",
+    "astro": "^1.0.0-beta.32"
+  },
+  "dependencies": {
+    "@webcomponents/template-shadowroot": "^0.1.0",
+    "lit": "^2.2.4",
+    "preact": "^10.7.2",
+    "react": "^18.1.0",
+    "react-dom": "^18.1.0",
+    "solid-js": "^1.4.2",
+    "svelte": "^3.48.0",
+    "vue": "^3.2.36"
+  }
+}

packages/astro/e2e/fixtures/client-only/src/components/PreactCounter.tsx

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+import { useState } from 'preact/hooks';
+
+/** a counter written in Preact */
+export function PreactCounter({ children, id }) {
+	const [count, setCount] = useState(0);
+	const add = () => setCount((i) => i + 1);
+	const subtract = () => setCount((i) => i - 1);
+
+	return (
+		<>
+			<div id={id} class="counter">
+				<button class="decrement" onClick={subtract}>-</button>
+				<pre>{count}</pre>
+				<button class="increment" onClick={add}>+</button>
+			</div>
+			<div class="counter-message">{children}</div>
+		</>
+	);
+}

packages/astro/e2e/fixtures/client-only/src/components/ReactCounter.jsx

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+import { useState } from 'react';
+
+/** a counter written in React */
+export function Counter({ children, id }) {
+	const [count, setCount] = useState(0);
+	const add = () => setCount((i) => i + 1);
+	const subtract = () => setCount((i) => i - 1);
+
+	return (
+		<>
+			<div id={id} className="counter">
+				<button className="decrement" onClick={subtract}>-</button>
+				<pre>{count}</pre>
+				<button className="increment" onClick={add}>+</button>
+			</div>
+			<div className="counter-message">{children}</div>
+		</>
+	);
+}

packages/astro/e2e/fixtures/client-only/src/components/SolidCounter.tsx

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+import { createSignal } from 'solid-js';
+
+/** a counter written with Solid */
+export default function SolidCounter({ children, id }) {
+	const [count, setCount] = createSignal(0);
+	const add = () => setCount(count() + 1);
+	const subtract = () => setCount(count() - 1);
+
+	return (
+		<>
+			<div id={id} class="counter">
+				<button class="decrement" onClick={subtract}>-</button>
+				<pre>{count()}</pre>
+				<button class="increment" onClick={add}>+</button>
+			</div>
+			<div class="counter-message">{children}</div>
+		</>
+	);
+}

packages/astro/e2e/fixtures/client-only/src/components/SvelteCounter.svelte

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+
+<script>
+	export let id;
+  let children;
+  let count = 0;
+
+  function add() {
+		count += 1;
+	}
+
+  function subtract() {
+		count -= 1;
+	}
+</script>
+
+<div {id} class="counter">
+  <button class="decrement" on:click={subtract}>-</button>
+  <pre>{ count }</pre>
+  <button class="increment" on:click={add}>+</button>
+</div>
+<div class="counter-message">
+  <slot />
+</div>
+
+<style>
+	.counter {
+		background: white;
+	}
+</style>

packages/astro/e2e/fixtures/client-only/src/components/VueCounter.vue

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+<template>
+	<div :id="id" class="counter">
+		<button class="decrement" @click="subtract()">-</button>
+		<pre>{{ count }}</pre>
+		<button class="increment" @click="add()">+</button>
+	</div>
+	<div class="counter-message">
+		<slot />
+	</div>
+</template>
+
+<script>
+import { ref } from 'vue';
+export default {
+	props: {
+		id: {
+			type: String,
+			required: true
+		}
+  },
+	setup(props) {
+		const count = ref(0);
+		const add = () => (count.value = count.value + 1);
+		const subtract = () => (count.value = count.value - 1);
+
+		return {
+			id: props.id,
+			count,
+			add,
+			subtract,
+		};
+	},
+};
+</script>

packages/astro/e2e/fixtures/client-only/src/pages/index.astro

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+---
+import * as react from '../components/ReactCounter.jsx';
+import { PreactCounter } from '../components/PreactCounter.tsx';
+import SolidCounter from '../components/SolidCounter.tsx';
+import VueCounter from '../components/VueCounter.vue';
+import SvelteCounter from '../components/SvelteCounter.svelte';
+
+// Full Astro Component Syntax:
+// https://docs.astro.build/core-concepts/astro-components/
+---
+
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<link rel="icon" type="image/x-icon" href="/favicon.ico" />
+	</head>
+	<body>
+		<main>
+			<react.Counter id="react-counter" client:only="react">
+				<h1>react</h1>
+			</react.Counter>
+
+			<PreactCounter id="preact-counter" client:only="preact">
+				<h1>preact</h1>
+			</PreactCounter>
+
+			<SolidCounter id="solid-counter" client:only="solid-js">
+				<h1>solid</h1>
+			</SolidCounter>
+
+			<VueCounter id="vue-counter" client:only="vue">
+				<h1>vue</h1>
+			</VueCounter>
+
+			<SvelteCounter id="svelte-counter" client:only="svelte">
+				<h1>svelte</h1>
+			</SvelteCounter>
+		</main>
+	</body>
+</html>