add test

Author: Rich-Harris

packages/svelte/tests/runtime-runes/samples/async-ownership-validation/Child.svelte

@@ -0,0 +1,7 @@
+<script>
+	let { object } = $props();
+
+	await 1;
+</script>
+
+<button onclick={() => object.count++}>clicks: {object.count}</button>

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

@@ -0,0 +1,22 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	compileOptions: {
+		dev: true
+	},
+
+	async test({ assert, target, warnings }) {
+		await tick();
+
+		const [button] = target.querySelectorAll('button');
+
+		button.click();
+		await tick();
+
+		assert.htmlEqual(target.innerHTML, '<button>clicks: 1</button>');
+		assert.deepEqual(warnings, [
+			'Mutating unbound props (`object`, at Child.svelte:7:23) is strongly discouraged. Consider using `bind:object={...}` in main.svelte (or using a callback) instead'
+		]);
+	}
+});

packages/svelte/tests/runtime-runes/samples/async-ownership-validation/main.svelte

@@ -0,0 +1,13 @@
+<script>
+	import Child from './Child.svelte';
+
+	let object = $state({ count: 0 });
+</script>
+
+<svelte:boundary>
+	<Child {object} />
+
+	{#snippet pending()}
+		<p>loading...</p>
+	{/snippet}
+</svelte:boundary>