From 421894ea25ef0df812c4eac7659c5e8c15a3d18f Mon Sep 17 00:00:00 2001
From: Fabrizio Duroni <fabrizio.duroni@gmail.com>
Date: Wed, 25 Feb 2026 22:22:24 +0100
Subject: [PATCH] fix: migrate LogBoxData-test to jest modern timers

---
 .../LogBox/Data/__tests__/LogBoxData-test.js  | 24 +++++++++++++------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/packages/react-native/Libraries/LogBox/Data/__tests__/LogBoxData-test.js b/packages/react-native/Libraries/LogBox/Data/__tests__/LogBoxData-test.js
index 15d955b20947..48bae2a748fa 100644
--- a/packages/react-native/Libraries/LogBox/Data/__tests__/LogBoxData-test.js
+++ b/packages/react-native/Libraries/LogBox/Data/__tests__/LogBoxData-test.js
@@ -10,9 +10,6 @@
 
 'use strict';
 
-// TODO(legacy-fake-timers): Fix these tests to work with modern timers.
-jest.useFakeTimers({legacyFakeTimers: true});
-
 jest.mock('../../../Core/Devtools/parseErrorStack', () => {
   return {__esModule: true, default: jest.fn(() => [])};
 });
@@ -144,16 +141,17 @@ const addSyntaxError = (options: $FlowFixMe) => {
   );
 };
 
-beforeEach(() => {
-  jest.resetModules();
-});
-
 const flushToObservers = () => {
   // Observer updates are debounced and need to advance timers to flush.
   jest.runOnlyPendingTimers();
 };
 
 describe('LogBoxData', () => {
+  beforeEach(() => {
+    jest.useFakeTimers();
+    jest.resetModules();
+  });
+
   it('adds and dismisses logs', () => {
     addLogs(['A']);
     addSoftErrors(['B']);
@@ -590,9 +588,13 @@ describe('LogBoxData', () => {
     expect(observer.mock.calls.length).toBe(1);
 
     addLogs(['A']);
+    flushToObservers();
     addSoftErrors(['B']);
+    flushToObservers();
     addFatalErrors(['C']);
+    flushToObservers();
     addSyntaxError();
+    flushToObservers();
     expect(observer.mock.calls.length).toBe(5);
 
     LogBoxData.clearWarnings();
@@ -610,9 +612,13 @@ describe('LogBoxData', () => {
     expect(observer.mock.calls.length).toBe(1);
 
     addLogs(['A']);
+    flushToObservers();
     addSoftErrors(['B']);
+    flushToObservers();
     addFatalErrors(['C']);
+    flushToObservers();
     addSyntaxError();
+    flushToObservers();
     expect(observer.mock.calls.length).toBe(5);
 
     LogBoxData.clearErrors();
@@ -854,4 +860,8 @@ describe('LogBoxData', () => {
       expect(Array.from(observerAfter.mock.calls[0][0].logs).length).toBe(0);
     });
   });
+
+  afterEach(() => {
+    jest.useRealTimers();
+  });
 });