add test

packages/svelte/tests/runtime-runes/samples/await-no-catch-error/_config.js

@@ -0,0 +1,22 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target }) {
+		const b1 = target.querySelector('button');
+
+		let err = '';
+		window.addEventListener('error', (e) => {
+			e.preventDefault();
+			err = e.message;
+		});
+
+		b1?.click();
+		await Promise.resolve();
+		flushSync();
+
+		assert.throws(() => {
+			throw err;
+		}, /Test/);
+	}
+});

packages/svelte/tests/runtime-runes/samples/await-no-catch-error/main.svelte

@@ -0,0 +1,12 @@
+<script>
+	const promise = new Promise((res, rej) => {
+		rej(new Error('Test'));
+	})
+	let toggle = $state(false);
+</script>
+
+<button onclick={() => toggle = !toggle}>toggle</button>
+
+{#if toggle}
+	{#await promise}{/await}
+{/if}