From 6f243c3743a7e505f59b1bbc0d70ffd052f27ec4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Tue, 5 Aug 2025 03:23:55 -0700
Subject: [PATCH] Add test for MemoryInfo

Summary:
Changelog: [internal]

Adds a test for `performance.memory`.

Reviewed By: hoxyq

Differential Revision: D79633246
---
 .../__tests__/PerformanceMemory-itest.js      | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 packages/react-native/src/private/webapis/performance/__tests__/PerformanceMemory-itest.js

diff --git a/packages/react-native/src/private/webapis/performance/__tests__/PerformanceMemory-itest.js b/packages/react-native/src/private/webapis/performance/__tests__/PerformanceMemory-itest.js
new file mode 100644
index 000000000000..1f4366d86fec
--- /dev/null
+++ b/packages/react-native/src/private/webapis/performance/__tests__/PerformanceMemory-itest.js
@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+import type Performance from '../Performance';
+
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
+
+declare var performance: Performance;
+
+describe('performance.memory', () => {
+  it('provides memory info', () => {
+    const memoryInfo = performance.memory;
+
+    expect(memoryInfo.usedJSHeapSize).toBeGreaterThan(0);
+    expect(memoryInfo.totalJSHeapSize).toBeGreaterThan(0);
+  });
+
+  it('always returns a new object', () => {
+    expect(performance.memory).not.toBe(performance.memory);
+  });
+});