diff --git a/packages/svelte/tests/runtime-runes/samples/async-attachment/_config.js b/packages/svelte/tests/runtime-runes/samples/async-attachment/_config.js
index 3a47111726..f6b48b38b1 100644
--- a/packages/svelte/tests/runtime-runes/samples/async-attachment/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/async-attachment/_config.js
@@ -4,6 +4,15 @@ import { test } from '../../test';
 export default test({
 	async test({ assert, target }) {
 		await tick();
-		assert.htmlEqual(target.innerHTML, '<p>foo</p><div>foo</div>');
+		assert.htmlEqual(target.innerHTML, '<button>toggle</button> <p>foo</p><div>foo</div>');
+
+		const [toggle] = target.querySelectorAll('button');
+		toggle.click();
+		await tick();
+		assert.htmlEqual(target.innerHTML, '<button>toggle</button>');
+
+		toggle.click();
+		await tick();
+		assert.htmlEqual(target.innerHTML, '<button>toggle</button> <p>foo</p><div>foo</div>');
 	}
 });
diff --git a/packages/svelte/tests/runtime-runes/samples/async-attachment/main.svelte b/packages/svelte/tests/runtime-runes/samples/async-attachment/main.svelte
index 7592e0e28b..6cef6e8f5c 100644
--- a/packages/svelte/tests/runtime-runes/samples/async-attachment/main.svelte
+++ b/packages/svelte/tests/runtime-runes/samples/async-attachment/main.svelte
@@ -1,11 +1,16 @@
 <script>
 	import Inner from './Inner.svelte';
+
+	let show = $state(true);
 </script>
 
 <svelte:boundary>
-	<Inner />
+	<button onclick={() => show = !show}>toggle</button>
+	{#if show}
+		<Inner />
+	{/if}
 
 	{#snippet pending()}
 		<p>pending</p>
 	{/snippet}
-</svelte:boundary>
\ No newline at end of file
+</svelte:boundary>