From 50da9268c3db183a7821877e1475726c9d8c3cbf Mon Sep 17 00:00:00 2001
From: raythurnvoid <53383860+raythurnvoid@users.noreply.github.com>
Date: Sat, 14 Jun 2025 18:35:51 +0100
Subject: [PATCH] Add test

---
 .../samples/array-push-in-effect/_config.js   | 33 +++++++++++++++++++
 .../samples/array-push-in-effect/main.svelte  | 17 ++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 packages/svelte/tests/runtime-runes/samples/array-push-in-effect/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/array-push-in-effect/main.svelte

diff --git a/packages/svelte/tests/runtime-runes/samples/array-push-in-effect/_config.js b/packages/svelte/tests/runtime-runes/samples/array-push-in-effect/_config.js
new file mode 100644
index 0000000000..a8ad512ed9
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/array-push-in-effect/_config.js
@@ -0,0 +1,33 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	/**
+	 * Ensure that mutating an array with push inside an $effect
+	 * does not cause an infinite re-execution loop.
+	 */
+	test({ assert, target }) {
+		const button = target.querySelector('button');
+
+		// initial render — effect should have run once
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>inc</button>
+				<p>0</p>
+			`
+		);
+
+		// increment count; effect should append one new entry only
+		flushSync(() => button?.click());
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>inc</button>
+				<p>0</p>
+				<p>1</p>
+			`
+		);
+	}
+}); 
\ No newline at end of file
diff --git a/packages/svelte/tests/runtime-runes/samples/array-push-in-effect/main.svelte b/packages/svelte/tests/runtime-runes/samples/array-push-in-effect/main.svelte
new file mode 100644
index 0000000000..a99567b86f
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/array-push-in-effect/main.svelte
@@ -0,0 +1,17 @@
+<script>
+	let count = $state(0);
+	let log = $state([]);
+
+	$effect(() => {
+		log.push(count);
+	});
+
+	function inc() {
+		count += 1;
+	}
+</script>
+
+<button on:click={inc}>inc</button>
+{#each log as item}
+	<p>{item}</p>
+{/each} 
\ No newline at end of file