add test

packages/svelte/tests/runtime-runes/samples/create-raw-snippet-invalid-render/_config.js

@@ -0,0 +1,13 @@
+import { test } from '../../test';
+
+export default test({
+	compileOptions: {
+		dev: true
+	},
+
+	skip_mode: ['hydrate'],
+
+	warnings: [
+		'The `render` function of `createRawSnippet` is expected to return the HTML for a single element. Ensure the HTML generated from `render` is correct.'
+	]
+});

packages/svelte/tests/runtime-runes/samples/create-raw-snippet-invalid-render/main.svelte

@@ -0,0 +1,14 @@
+<script>
+	import { createRawSnippet } from 'svelte';
+
+	const snippet = createRawSnippet(() => ({
+		render: () => `
+			<!-- --><div>123</div>
+		`,
+		setup(target) {
+
+		}
+	}));
+</script>
+
+{@render snippet()}