add test

packages/svelte/tests/hydration/samples/noscript/_before.html

@@ -0,0 +1,2 @@
+<!--ssr:0--><noscript>JavaScript is required for this site.</noscript>
+<h1>Hello!</h1><p>Count: 0</p><!--ssr:0-->

packages/svelte/tests/hydration/samples/noscript/main.svelte

@@ -0,0 +1,9 @@
+<script>
+  import { onMount } from "svelte";
+  let count = 0;
+  onMount(() => count++);
+</script>
+
+<noscript>JavaScript is required for this site.</noscript>
+
+<h1>Hello!</h1><p>Count: {count}</p>