add test

packages/svelte/tests/runtime-runes/samples/effect-order-2/_config.js

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+import { test } from '../../test';
+import { flushSync } from 'svelte';
+import { log } from './log.js';
+
+export default test({
+	before_test() {
+		log.length = 0;
+	},
+
+	async test({ assert, target }) {
+		const [b1] = target.querySelectorAll('button');
+		flushSync(() => {
+			b1.click();
+		});
+		flushSync(() => {
+			b1.click();
+		});
+		assert.deepEqual(log, [
+			{ a: 1 },
+			{ b: 1 },
+			{ c: 1 },
+			{ a: 2 },
+			{ b: 2 },
+			{ c: 2 },
+			{ a: 3 },
+			{ b: 3 },
+			{ c: 3 }
+		]);
+	}
+});

packages/svelte/tests/runtime-runes/samples/effect-order-2/log.js

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+/** @type {any[]} */
+export const log = [];

packages/svelte/tests/runtime-runes/samples/effect-order-2/main.svelte

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+<script>
+	import { log } from './log.js';
+	let a = $state(1);
+	let b = $state(1);
+	let c = $state(1);
+
+	$effect(() => {
+		log.push({ a });
+	});
+
+	$effect(() => {
+		log.push({ b });
+	});
+
+	$effect(() => {
+		log.push({ c });
+	});
+
+	function increment() {
+		b += 1;
+		c += 1;
+		a += 1;
+	}
+</script>
+
+<button onclick={increment}>
+	increment
+</button>