BaseService - Use lowercase key in resetSingle

system/Config/BaseService.php

@@ -288,7 +288,7 @@ public static function reset(bool $initAutoloader = false)
      */
     public static function resetSingle(string $name)
     {
-        unset(static::$mocks[$name], static::$instances[$name]);
+        unset(static::$mocks[strtolower($name)], static::$instances[strtolower($name)]);
     }
 
     /**

tests/_support/Config/Services.php

@@ -14,6 +14,7 @@
 use CodeIgniter\HTTP\URI;
 use Config\Services as BaseServices;
 use RuntimeException;
+use stdClass;
 
 /**
  * Services Class
@@ -43,4 +44,20 @@ public static function uri(?string $uri = null, bool $getShared = true)
 
         return new URI($uri);
     }
+
+    /**
+     * The URI class provides a way to model and manipulate URIs.
+     *
+     * @param mixed $getShared
+     *
+     * @return stdClass
+     */
+    public static function someService($getShared = true)
+    {
+        if ($getShared) {
+            return static::getSharedInstance('someService');
+        }
+
+        return new stdClass();
+    }
 }

tests/system/Config/ServicesTest.php

@@ -343,6 +343,17 @@ public function testResetSingle()
         $this->assertSame($security, $security2);
     }
 
+    public function testResetSingleCaseInsensitive()
+    {
+        Services::injectMock('someService', new App());
+        $someService = service('someService');
+        $this->assertInstanceOf(App::class, $someService);
+
+        Services::resetSingle('someService');
+        $someService = service('someService');
+        $this->assertNotInstanceOf(App::class, $someService);
+    }
+
     public function testFilters()
     {
         $result = Services::filters();