chore: failing test for derived + fork + block

packages/svelte/tests/runtime-runes/samples/fork-derived-value/_config.js

@@ -0,0 +1,19 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target }) {
+		const [fork, update] = target.querySelectorAll('button');
+
+		flushSync(() => {
+			fork.click();
+		});
+		flushSync(() => {
+			update.click();
+		});
+
+		const p = target.querySelector('p');
+
+		assert.equal(p?.textContent, 'one');
+	}
+});

packages/svelte/tests/runtime-runes/samples/fork-derived-value/main.svelte

@@ -0,0 +1,23 @@
+<script>
+	import { fork, flushSync } from "svelte";
+	
+	let state = $state(0);
+
+	let count = $derived(state);
+
+	let forked;
+</script>
+
+<button onclick={()=>{
+	forked = fork(()=>{
+		state++;
+	})
+}}></button>
+
+<button onclick={()=>{
+	state++;
+}}></button>
+
+{#if count === 1}
+	<p>one</p>
+{/if}