add test

packages/svelte/tests/runtime-legacy/samples/lifecycle-render-afterUpdate2/_config.js

@@ -0,0 +1,38 @@
+import { test, ok } from '../../test';
+import { flushSync } from 'svelte';
+
+const log = console.log;
+/** @type {string[]} */
+let messages = [];
+
+export default test({
+	before_test: () => {
+		console.log = (msg) => messages.push(msg);
+		messages = [];
+	},
+	after_test: () => {
+		console.log = log;
+	},
+	test({ assert, target, window }) {
+		const [button1, button2] = target.querySelectorAll('button');
+		ok(button1);
+		ok(button2);
+
+		button1.click();
+		flushSync();
+		button2.click();
+		flushSync();
+
+		assert.deepEqual(messages, ['after update 0, 0', 'after update 1, 0', 'after update 1, 1']);
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			<button>count:
+			1</button><button>count
+			2:
+			1</button><hr>
+			1
+		`
+		);
+	}
+});

packages/svelte/tests/runtime-legacy/samples/lifecycle-render-afterUpdate2/main.svelte

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+<script>
+	import AfterUpdate from "./sub.svelte";
+	let count = 0;
+	let count2 = 0;
+
+	function increment() {
+		count += 1;
+	}
+	function increment2() {
+		count2 += 1;
+	}
+</script>
+
+<button on:click={increment}>
+	count: {count}
+</button>
+<button on:click={increment2}>
+	count 2: {count2}
+</button>
+<hr />
+<AfterUpdate {count} {count2}/>

packages/svelte/tests/runtime-legacy/samples/lifecycle-render-afterUpdate2/sub.svelte

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+<script>
+	import { afterUpdate } from "svelte";
+
+	export let count;
+	export let count2;
+
+	afterUpdate(()=>{
+		console.log(`after update ${count}, ${count2}`);
+	});
+</script>
+
+{count}