[5.7] Create getter for the http middleware groups

src/Illuminate/Foundation/Http/Kernel.php

@@ -335,4 +335,14 @@ public function getApplication()
     {
         return $this->app;
     }
+
+    /**
+     * Get the application's route middleware groups.
+     *
+     * @return array
+     */
+    public function getMiddlewareGroups()
+    {
+        return $this->middlewareGroups;
+    }
 }

tests/Foundation/Http/KernelTest.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Illuminate\Tests\Foundation\Http;
+
+use Illuminate\Routing\Router;
+use PHPUnit\Framework\TestCase;
+use Illuminate\Events\Dispatcher;
+use Illuminate\Foundation\Application;
+use Illuminate\Foundation\Http\Kernel;
+
+class KernelTest extends TestCase
+{
+    public function testGetMiddlewareGroups()
+    {
+        $kernel = new Kernel($this->getApplication(), $this->getRouter());
+
+        $this->assertEquals([], $kernel->getMiddlewareGroups());
+    }
+
+    /**
+     * @return \Illuminate\Foundation\Application
+     */
+    protected function getApplication()
+    {
+        return new Application;
+    }
+
+    /**
+     * @return \Illuminate\Routing\Router
+     */
+    protected function getRouter()
+    {
+        return new Router(new Dispatcher);
+    }
+}