[12.x] Add HigherOrderProxy tests (Collection & Tap) (#58138)

* Add HigherOrderProxy tests

* style fixed

Author: miladev95

tests/Support/HigherOrderProxyTest.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Illuminate\Tests\Support;
+
+use Illuminate\Support\Collection;
+use Illuminate\Support\HigherOrderCollectionProxy;
+use Illuminate\Support\HigherOrderTapProxy;
+use PHPUnit\Framework\TestCase;
+
+class HigherOrderProxyTest extends TestCase
+{
+    public function test_get_proxies_property_access_to_items()
+    {
+        $items = new Collection([
+            (object) ['name' => 'Alice'],
+            (object) ['name' => 'Bob'],
+        ]);
+
+        $proxy = new HigherOrderCollectionProxy($items, 'pluck');
+
+        // The proxied method returns a Collection instance; assert type and values
+        $this->assertInstanceOf(Collection::class, $proxy->name);
+        $this->assertEquals(['Alice', 'Bob'], $proxy->name->all());
+    }
+
+    public function test_call_proxies_method_call_to_items()
+    {
+        $items = new Collection([
+            new class
+            {
+                public function shout($s)
+                {
+                    return strtoupper($s);
+                }
+            },
+            new class
+            {
+                public function shout($s)
+                {
+                    return strtoupper($s).'!';
+                }
+            },
+        ]);
+
+        $proxy = new HigherOrderCollectionProxy($items, 'map');
+
+        $result = $proxy->shout('hey');
+
+        $this->assertEquals(['HEY', 'HEY!'], $result->all());
+    }
+
+    public function test_call_forwards_and_returns_target()
+    {
+        $target = new class
+        {
+            public $count = 0;
+
+            public function increment($by = 1)
+            {
+                $this->count += $by;
+            }
+        };
+
+        $proxy = new HigherOrderTapProxy($target);
+
+        $result = $proxy->increment(3);
+
+        $this->assertSame(3, $target->count);
+        $this->assertSame($target, $result);
+    }
+}