use error boundary for test - vitest does some weird error swallowing afaict

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

@@ -35,8 +35,7 @@ export default test({
 		await tick();
 		three.click();
 		await tick();
-		assert.fail('should not allow duplicate keys');
-	},
 
-	runtime_error: 'each_key_duplicate'
+		assert.include(target.innerHTML, '<p>each_key_duplicate');
+	}
 });

packages/svelte/tests/runtime-runes/samples/async-each-keyed/main.svelte

@@ -14,6 +14,10 @@
 		{/each}
 	</div>
 
+	{#snippet failed(e)}
+		<p>{e.message}</p>
+	{/snippet}
+
 	{#snippet pending()}
 		<p>pending</p>
 	{/snippet}