fix: add test for node-match trailing comment problem

Author: sina-salahshour

packages/svelte/test/runtime/samples/comment-effect-on-reactivity/SomeComponent.svelte

@@ -0,0 +1,20 @@
+<script>
+	export let objectProp;
+	let count = 0;
+	$: objectPropCopy = [...objectProp];
+
+	$: incrementCount(), console.log('propDependencyChanged', objectProp);
+	const incrementCount = () => {
+		count++;
+	};
+	const clickAction = () => {
+		//note that this file shouldn't be formatted and the trailing comment must be rightnext to the variable name
+		// prettier-ignore
+		objectPropCopy = objectPropCopy// trailing comment
+	};
+</script>
+
+<button on:click={clickAction}>click me!</button>
+
+{objectPropCopy}
+<div id="render-count">{count}</div>

packages/svelte/test/runtime/samples/comment-effect-on-reactivity/_config.js

@@ -0,0 +1,9 @@
+export default {
+	async test({ assert, target, window }) {
+		const incrementButton = target.querySelector('button');
+
+		assert.equal(target.querySelector('#render-count').innerHTML, '1');
+		await incrementButton.dispatchEvent(new window.MouseEvent('click'));
+		assert.equal(target.querySelector('#render-count').innerHTML, '2');
+	}
+};

packages/svelte/test/runtime/samples/comment-effect-on-reactivity/main.svelte

@@ -0,0 +1,8 @@
+<script>
+	import SomeComponent from './SomeComponent.svelte';
+	let objectProp = ['name', 'age'];
+
+	// look in SomeComponent.svelte for explaination
+</script>
+
+<SomeComponent {objectProp} />