add test

packages/svelte/tests/runtime-runes/samples/async-await/_config.js

@@ -0,0 +1,43 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target }) {
+		const [reset, one, two, reject] = target.querySelectorAll('button');
+
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			'<button>reset</button><button>one</button><button>two</button><button>reject</button> waiting'
+		);
+
+		one.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			'<button>reset</button><button>one</button><button>two</button><button>reject</button> one_res'
+		);
+
+		reset.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			'<button>reset</button><button>one</button><button>two</button><button>reject</button> waiting'
+		);
+
+		two.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			'<button>reset</button><button>one</button><button>two</button><button>reject</button> two_res'
+		);
+
+		reset.click();
+		reject.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			'<button>reset</button><button>one</button><button>two</button><button>reject</button> reject_catch'
+		);
+	}
+});

packages/svelte/tests/runtime-runes/samples/async-await/main.svelte

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+<script>
+	let deferred = $state(Promise.withResolvers());
+</script>
+
+<button onclick={() => deferred = Promise.withResolvers()}>reset</button>
+<button onclick={() => deferred.resolve("one")}>one</button>
+<button onclick={() => deferred.resolve("two")}>two</button>
+<button onclick={() => deferred.reject("reject")}>reject</button>
+
+<svelte:boundary>
+	{#await await deferred.promise + "_res"}
+		waiting
+	{:then res}
+		{res}
+	{:catch err}
+		{err}_catch
+	{/await}
+
+	{#snippet pending()}
+		<p>pending</p>
+	{/snippet}
+</svelte:boundary>