Add test cases

test/runtime/samples/binding-using-props/TextInput.svelte

@@ -0,0 +1,6 @@
+<script>
+    export let actualValue;
+    let x = $$props;
+</script>
+
+<input bind:value={actualValue}>

test/runtime/samples/binding-using-props/_config.js

@@ -0,0 +1,14 @@
+export default {
+	async test({ assert, target, window }) {
+		const input = target.querySelector('input');
+	
+		const event = new window.Event('input');
+		input.value = 'changed';
+		await input.dispatchEvent(event);
+
+		assert.htmlEqual(target.innerHTML, `
+			<input>
+			<p>changed</p>
+		`);
+	}
+};

test/runtime/samples/binding-using-props/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	import Input from './TextInput.svelte';
+	export let actualValue = '';
+</script>
+
+<Input bind:actualValue />
+<p>{actualValue}</p>