Expose props for testing the state

Author: RaiVaibhav

packages/svelte/tests/runtime-legacy/samples/binding-focused/main.svelte

@@ -1,6 +1,6 @@
 <script>
-	let a;
-	let b;
+	export let a;
+	export let b;
 </script>
 <div>{a}</div>
 <div>{b}</div>