diff --git a/app/Services/Hook.php b/app/Services/Hook.php
index 88081acc..e8dc1946 100644
--- a/app/Services/Hook.php
+++ b/app/Services/Hook.php
@@ -48,6 +48,8 @@ class Hook
      * Add a route. A router instance will be passed to the given callback.
      *
      * @param Closure $callback
+     *
+     * TODO: Needs to be tested.
      */
     public static function addRoute(Closure $callback)
     {
diff --git a/tests/ServicesTest/HookTest.php b/tests/ServicesTest/HookTest.php
new file mode 100644
index 00000000..e0f14735
--- /dev/null
+++ b/tests/ServicesTest/HookTest.php
@@ -0,0 +1,55 @@
+<?php
+
+use App\Services\Hook;
+
+class HookTest extends TestCase
+{
+    public function testAddMenuItem()
+    {
+        Hook::addMenuItem('user', 0, [
+            'title' => 'Go to closet',
+            'link' => '/user/closet',
+            'icon' => 'fa-book'
+        ]);
+        $this->actAs('normal')
+            ->visit('/user')
+            ->see('Go to closet')
+            ->see('/user/closet')
+            ->see('fa-book')
+            ->click('Go to closet')
+            ->seePageIs('/user/closet');
+    }
+
+    public function testRegisterPluginTransScripts()
+    {
+        Hook::registerPluginTransScripts('example-plugin');
+        $this->get('/')
+            ->see('example-plugin/lang/en/locale.js');
+    }
+
+    public function testAddStyleFileToPage()
+    {
+        Hook::addStyleFileToPage('/style/all');
+        $this->visit('/')
+            ->see('<link rel="stylesheet" href="/style/all">');
+
+        Hook::addStyleFileToPage('/style/pattern', ['skinlib']);
+        $this->visit('/')
+            ->dontSee('<link rel="stylesheet" href="/style/pattern">');
+        $this->visit('/skinlib')
+            ->see('<link rel="stylesheet" href="/style/pattern">');
+    }
+
+    public function testAddScriptFileToPage()
+    {
+        Hook::addScriptFileToPage('/script/all');
+        $this->visit('/')
+            ->see('<script src="/script/all"></script>');
+
+        Hook::addScriptFileToPage('/script/pattern', ['skinlib']);
+        $this->visit('/')
+            ->dontSee('<script src="/script/pattern"></script>');
+        $this->visit('/skinlib')
+            ->see('<script src="/script/pattern"></script>');
+    }
+}