diff --git a/tests/Feature/RequestsOptimizationTest.php b/tests/Feature/RequestsOptimizationTest.php
index 6c8f2f9..b7d0832 100644
--- a/tests/Feature/RequestsOptimizationTest.php
+++ b/tests/Feature/RequestsOptimizationTest.php
@@ -10,7 +10,6 @@
         ->middleware('log', Middleware::tap(fn() => $log->push('before'), fn() => $log->push('after')))
         ->onRequest(fn() => $log->push('onRequest'))
         ->onResponse(fn() => $log->push('onResponse'))
-        ->sync()
         ->totalPages('meta.total_pages')
         ->collect('data.*');
 
@@ -49,3 +48,22 @@
 
     expect($log)->sequence('before', 'after', 'onError');
 });
+
+it('sends HTTP requests asynchronously', function () {
+    $log = collect();
+
+    $lazyCollection = LazyJsonPages::from('https://example.com/api/v1/users')
+        ->onRequest(fn() => $log->push('sending'))
+        ->onResponse(fn() => $log->push('sent'))
+        ->async(3)
+        ->totalPages('meta.total_pages')
+        ->collect('data.*');
+
+    expect($lazyCollection)->toLoadItemsViaRequests([
+        'https://example.com/api/v1/users' => 'pagination/page1.json',
+        'https://example.com/api/v1/users?page=2' => 'pagination/page2.json',
+        'https://example.com/api/v1/users?page=3' => 'pagination/page3.json',
+    ]);
+
+    expect($log)->sequence('sending', 'sent', 'sending', 'sending', 'sent', 'sent');
+});