beef up test

packages/svelte/tests/runtime-runes/samples/attachment-component-spread/_config.js

@@ -1,6 +1,15 @@
+import { flushSync } from 'svelte';
 import { test } from '../../test';
 
 export default test({
-	ssrHtml: `<div></div>`,
-	html: `<div>set from component</div>`
+	html: `<button>update</button><div></div>`,
+
+	test({ target, assert, logs }) {
+		const button = target.querySelector('button');
+
+		assert.deepEqual(logs, ['one DIV']);
+
+		flushSync(() => button?.click());
+		assert.deepEqual(logs, ['one DIV', 'cleanup one', 'two DIV']);
+	}
 });

packages/svelte/tests/runtime-runes/samples/attachment-component-spread/main.svelte

@@ -3,8 +3,28 @@
 	import Child from './Child.svelte';
 
 	let stuff = $state({
-		[createAttachmentKey()]: (node) => node.textContent = 'set from component'
+		[createAttachmentKey()]: (node) => {
+			console.log(`one ${node.nodeName}`);
+
+			return () => {
+				console.log('cleanup one');
+			};
+		}
 	});
+
+	function update() {
+		stuff = {
+			[createAttachmentKey()]: (node) => {
+				console.log(`two ${node.nodeName}`);
+
+				return () => {
+					console.log('cleanup two');
+				}
+			}
+		};
+	}
 </script>
 
+<button onclick={update}>update</button>
+
 <Child {...stuff} />