diff --git a/tests/_support/Test/TestForReflectionHelper.php b/tests/_support/Test/TestForReflectionHelper.php
new file mode 100644
index 000000000000..6ea9bea597cd
--- /dev/null
+++ b/tests/_support/Test/TestForReflectionHelper.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Support\Test;
+
+class TestForReflectionHelper
+{
+    private string $private               = 'secret';
+    private static string $static_private = 'xyz';
+
+    public function getPrivate()
+    {
+        return $this->private;
+    }
+
+    public static function getStaticPrivate()
+    {
+        return self::$static_private;
+    }
+
+    private function privateMethod($param1, $param2)
+    {
+        return 'private ' . $param1 . $param2;
+    }
+
+    private static function privateStaticMethod($param1, $param2)
+    {
+        return 'private_static ' . $param1 . $param2;
+    }
+}
diff --git a/tests/system/Test/ReflectionHelperTest.php b/tests/system/Test/ReflectionHelperTest.php
index 414053b26dc1..86eb65ffbf51 100644
--- a/tests/system/Test/ReflectionHelperTest.php
+++ b/tests/system/Test/ReflectionHelperTest.php
@@ -11,6 +11,8 @@
 
 namespace CodeIgniter\Test;
 
+use Tests\Support\Test\TestForReflectionHelper;
+
 /**
  * @internal
  *
@@ -20,14 +22,14 @@ final class ReflectionHelperTest extends CIUnitTestCase
 {
     public function testGetPrivatePropertyWithObject(): void
     {
-        $obj    = new __TestForReflectionHelper();
+        $obj    = new TestForReflectionHelper();
         $actual = $this->getPrivateProperty($obj, 'private');
         $this->assertSame('secret', $actual);
     }
 
     public function testGetPrivatePropertyWithObjectStaticCall(): void
     {
-        $obj    = new __TestForReflectionHelper();
+        $obj    = new TestForReflectionHelper();
         $actual = CIUnitTestCase::getPrivateProperty($obj, 'private');
         $this->assertSame('secret', $actual);
     }
@@ -35,7 +37,7 @@ public function testGetPrivatePropertyWithObjectStaticCall(): void
     public function testGetPrivatePropertyWithStatic(): void
     {
         $actual = $this->getPrivateProperty(
-            __TestForReflectionHelper::class,
+            TestForReflectionHelper::class,
             'static_private'
         );
         $this->assertSame('xyz', $actual);
@@ -43,7 +45,7 @@ public function testGetPrivatePropertyWithStatic(): void
 
     public function testSetPrivatePropertyWithObject(): void
     {
-        $obj = new __TestForReflectionHelper();
+        $obj = new TestForReflectionHelper();
         $this->setPrivateProperty(
             $obj,
             'private',
@@ -55,19 +57,19 @@ public function testSetPrivatePropertyWithObject(): void
     public function testSetPrivatePropertyWithStatic(): void
     {
         $this->setPrivateProperty(
-            __TestForReflectionHelper::class,
+            TestForReflectionHelper::class,
             'static_private',
             'abc'
         );
         $this->assertSame(
             'abc',
-            __TestForReflectionHelper::getStaticPrivate()
+            TestForReflectionHelper::getStaticPrivate()
         );
     }
 
     public function testGetPrivateMethodInvokerWithObject(): void
     {
-        $obj    = new __TestForReflectionHelper();
+        $obj    = new TestForReflectionHelper();
         $method = $this->getPrivateMethodInvoker(
             $obj,
             'privateMethod'
@@ -81,7 +83,7 @@ public function testGetPrivateMethodInvokerWithObject(): void
     public function testGetPrivateMethodInvokerWithStatic(): void
     {
         $method = $this->getPrivateMethodInvoker(
-            __TestForReflectionHelper::class,
+            TestForReflectionHelper::class,
             'privateStaticMethod'
         );
         $this->assertSame(
@@ -90,29 +92,3 @@ public function testGetPrivateMethodInvokerWithStatic(): void
         );
     }
 }
-
-class __TestForReflectionHelper
-{
-    private string $private               = 'secret';
-    private static string $static_private = 'xyz';
-
-    public function getPrivate()
-    {
-        return $this->private;
-    }
-
-    public static function getStaticPrivate()
-    {
-        return self::$static_private;
-    }
-
-    private function privateMethod($param1, $param2)
-    {
-        return 'private ' . $param1 . $param2;
-    }
-
-    private static function privateStaticMethod($param1, $param2)
-    {
-        return 'private_static ' . $param1 . $param2;
-    }
-}
diff --git a/tests/system/Test/TestCaseTest.php b/tests/system/Test/TestCaseTest.php
index e5e1ed8cb3f6..ea71ddd0ac48 100644
--- a/tests/system/Test/TestCaseTest.php
+++ b/tests/system/Test/TestCaseTest.php
@@ -15,6 +15,7 @@
 use CodeIgniter\Events\Events;
 use CodeIgniter\HTTP\Response;
 use Config\App;
+use Tests\Support\Test\TestForReflectionHelper;
 
 /**
  * @internal
@@ -35,7 +36,7 @@ protected function setUp(): void
 
     public function testGetPrivatePropertyWithObject(): void
     {
-        $obj    = new __TestForReflectionHelper();
+        $obj    = new TestForReflectionHelper();
         $actual = $this->getPrivateProperty($obj, 'private');
         $this->assertSame('secret', $actual);
     }
@@ -54,6 +55,8 @@ public function testAssertLogContains(): void
 
     public function testEventTriggering(): void
     {
+        $result = '';
+
         Events::on('foo', static function ($arg) use (&$result): void {
             $result = $arg;
         });
@@ -61,6 +64,7 @@ public function testEventTriggering(): void
         Events::trigger('foo', 'bar');
 
         $this->assertEventTriggered('foo');
+        $this->assertSame('bar', $result);
     }
 
     public function testStreamFilter(): void