Added Twig template functions

19 files changed, 487 insertions, 24 deletions

diff --git a/src/Config/ConfigServiceProvider.php b/src/Config/ConfigServiceProvider.php
index 01b648df..21cbbeb6 100644
--- a/src/Config/ConfigServiceProvider.php
+++ b/src/Config/ConfigServiceProvider.php
@@ -12,6 +12,7 @@ class ConfigServiceProvider extends ServiceProvider
         $configFile = config_path('config.php');
 
         $config = $this->app->make(Config::class);
+        $this->app->instance(Config::class, $config);
         $this->app->instance('config', $config);
 
         $config->set(require $defaultConfigFile);
diff --git a/src/Http/SessionServiceProvider.php b/src/Http/SessionServiceProvider.php
index 55e3f48b..59121a3b 100644
--- a/src/Http/SessionServiceProvider.php
+++ b/src/Http/SessionServiceProvider.php
@@ -17,6 +17,7 @@ class SessionServiceProvider extends ServiceProvider
         $this->app->bind(SessionStorageInterface::class, 'session.storage');
 
         $session = $this->app->make(Session::class);
+        $this->app->instance(Session::class, $session);
         $this->app->instance('session', $session);
 
         /** @var Request $request */
diff --git a/src/Http/UrlGeneratorServiceProvider.php b/src/Http/UrlGeneratorServiceProvider.php
index 37304076..9b9988aa 100644
--- a/src/Http/UrlGeneratorServiceProvider.php
+++ b/src/Http/UrlGeneratorServiceProvider.php
@@ -9,6 +9,7 @@ class UrlGeneratorServiceProvider extends ServiceProvider
     public function register()
     {
         $urlGenerator = $this->app->make(UrlGenerator::class);
+        $this->app->instance(UrlGenerator::class, $urlGenerator);
         $this->app->instance('http.urlGenerator', $urlGenerator);
     }
 }
diff --git a/src/Middleware/LegacyMiddleware.php b/src/Middleware/LegacyMiddleware.php
index 37ae9331..bf849611 100644
--- a/src/Middleware/LegacyMiddleware.php
+++ b/src/Middleware/LegacyMiddleware.php
@@ -284,21 +284,11 @@ class LegacyMiddleware implements MiddlewareInterface
         }
 
         return response(view('layouts/app', [
-            'theme'          => isset($user) ? $user['color'] : config('theme'),
             'title'          => $title,
-            'atom_link'      => ($page == 'news' || $page == 'user_meetings')
-                ? ' <link href="'
-                . page_link_to('atom', $parameters)
-                . '" type = "application/atom+xml" rel = "alternate" title = "Atom Feed">'
-                : '',
-            'start_page_url' => page_link_to('/'),
-            'credits_url'    => page_link_to('credits'),
+            'atom_feed'      => ($page == 'news' || $page == 'user_meetings') ? $parameters : [],
             'menu'           => make_menu(),
             'content'        => msg() . $content,
             'header_toolbar' => header_toolbar(),
-            'faq_url'        => config('faq_url'),
-            'contact_email'  => config('contact_email'),
-            'locale'         => locale(),
             'event_info'     => EventConfig_info($event_config) . ' <br />'
         ]), $status);
     }
diff --git a/src/Renderer/Twig/Extensions/Config.php b/src/Renderer/Twig/Extensions/Config.php
new file mode 100644
index 00000000..dbbe93e7
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Config.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Engelsystem\Config\Config as EngelsystemConfig;
+use Twig_Extension as TwigExtension;
+use Twig_Function as TwigFunction;
+
+class Config extends TwigExtension
+{
+    /** @var EngelsystemConfig */
+    protected $config;
+
+    /**
+     * @param EngelsystemConfig $config
+     */
+    public function __construct(EngelsystemConfig $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('config', [$this->config, 'get']),
+        ];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Globals.php b/src/Renderer/Twig/Extensions/Globals.php
new file mode 100644
index 00000000..f9bffbc8
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Globals.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Twig_Extension as TwigExtension;
+use Twig_Extension_GlobalsInterface as GlobalsInterface;
+
+class Globals extends TwigExtension implements GlobalsInterface
+{
+    /**
+     * Returns a list of global variables to add to the existing list.
+     *
+     * @return array An array of global variables
+     */
+    public function getGlobals()
+    {
+        global $user;
+
+        return [
+            'user' => isset($user) ? $user : [],
+        ];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Session.php b/src/Renderer/Twig/Extensions/Session.php
new file mode 100644
index 00000000..4690f701
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Session.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Symfony\Component\HttpFoundation\Session\Session as SymfonySession;
+use Twig_Extension as TwigExtension;
+use Twig_Function as TwigFunction;
+
+class Session extends TwigExtension
+{
+    /** @var SymfonySession */
+    protected $session;
+
+    /**
+     * @param SymfonySession $session
+     */
+    public function __construct(SymfonySession $session)
+    {
+        $this->session = $session;
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('session_get', [$this->session, 'get']),
+        ];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Url.php b/src/Renderer/Twig/Extensions/Url.php
new file mode 100644
index 00000000..62e59782
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Url.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Engelsystem\Http\UrlGenerator;
+use Twig_Extension as TwigExtension;
+use Twig_Function as TwigFunction;
+
+class Url extends TwigExtension
+{
+    /** @var UrlGenerator */
+    protected $urlGenerator;
+
+    /**
+     * @param UrlGenerator $urlGenerator
+     */
+    public function __construct(UrlGenerator $urlGenerator)
+    {
+        $this->urlGenerator = $urlGenerator;
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('url', [$this, 'getUrl']),
+        ];
+    }
+
+    /**
+     * @param string $path
+     * @param array  $parameters
+     * @return UrlGenerator|string
+     */
+    public function getUrl($path, $parameters = [])
+    {
+        $path = str_replace('_', '-', $path);
+
+        return $this->urlGenerator->to($path, $parameters);
+    }
+}
diff --git a/src/Renderer/TwigServiceProvider.php b/src/Renderer/TwigServiceProvider.php
index 23810863..4a5b1de3 100644
--- a/src/Renderer/TwigServiceProvider.php
+++ b/src/Renderer/TwigServiceProvider.php
@@ -3,14 +3,40 @@
 namespace Engelsystem\Renderer;
 
 use Engelsystem\Container\ServiceProvider;
+use Engelsystem\Renderer\Twig\Extensions\Config;
+use Engelsystem\Renderer\Twig\Extensions\Globals;
+use Engelsystem\Renderer\Twig\Extensions\Session;
+use Engelsystem\Renderer\Twig\Extensions\Url;
 use Twig_Environment as Twig;
 use Twig_LoaderInterface as TwigLoaderInterface;
 
 class TwigServiceProvider extends ServiceProvider
 {
+    /** @var array */
+    protected $extensions = [
+        'config'  => Config::class,
+        'globals' => Globals::class,
+        'session' => Session::class,
+        'url'     => Url::class,
+    ];
+
     public function register()
     {
         $this->registerTwigEngine();
+
+        foreach ($this->extensions as $alias => $class) {
+            $this->registerTwigExtensions($class, $alias);
+        }
+    }
+
+    public function boot()
+    {
+        /** @var Twig $renderer */
+        $renderer = $this->app->get('twig.environment');
+
+        foreach ($this->app->tagged('twig.extension') as $extension) {
+            $renderer->addExtension($extension);
+        }
     }
 
     protected function registerTwigEngine()
@@ -20,12 +46,30 @@ class TwigServiceProvider extends ServiceProvider
         $twigLoader = $this->app->make(TwigLoader::class, ['paths' => $viewsPath]);
         $this->app->instance(TwigLoader::class, $twigLoader);
         $this->app->instance(TwigLoaderInterface::class, $twigLoader);
+        $this->app->instance('twig.loader', $twigLoader);
 
         $twig = $this->app->make(Twig::class);
         $this->app->instance(Twig::class, $twig);
+        $this->app->instance('twig.environment', $twig);
 
         $twigEngine = $this->app->make(TwigEngine::class);
         $this->app->instance('renderer.twigEngine', $twigEngine);
         $this->app->tag('renderer.twigEngine', ['renderer.engine']);
     }
+
+    /**
+     * @param string $class
+     * @param string $alias
+     */
+    protected function registerTwigExtensions($class, $alias)
+    {
+        $alias = 'twig.extension.' . $alias;
+
+        $extension = $this->app->make($class);
+
+        $this->app->instance($class, $extension);
+        $this->app->instance($alias, $extension);
+
+        $this->app->tag($alias, ['twig.extension']);
+    }
 }
diff --git a/templates/layouts/app.twig b/templates/layouts/app.twig
index 6b6bd16f..42d5610c 100644
--- a/templates/layouts/app.twig
+++ b/templates/layouts/app.twig
@@ -1,3 +1,4 @@
+{% set theme = user.color|default(config('theme')) %}
 <!DOCTYPE html>
 <html>
 <head>
@@ -10,7 +11,9 @@
         <link rel="stylesheet" type="text/css" href="vendor/bootstrap-datepicker-1.7.1/css/bootstrap-datepicker3.min.css"/>
         <script type="text/javascript" src="vendor/jquery-2.1.1.min.js"></script>
         <script type="text/javascript" src="vendor/jquery-ui.min.js"></script>
-        {{ atom_link|raw }}
+        {% if atom_feed -%}
+            <link href="{{ url('atom', atom_feed) }}" type="application/atom+xml" rel="alternate" title="Atom Feed">
+        {% endif %}
     {% endblock %}
 </head>
 <body>
@@ -27,14 +30,16 @@
                         <span class="icon-bar"></span>
                         <span class="icon-bar"></span>
                     </button>
-                    <a class="navbar-brand" href="{{ start_page_url }}">
+                    <a class="navbar-brand" href="{{ url('/') }}">
                         <span class="icon-icon_angel"></span> <strong class="visible-lg-inline">ENGELSYSTEM</strong>
                     </a>
                 </div>
 
                 {% block navbar %}
-                    <div class="collapse navbar-collapse"
-                         id="navbar-collapse-1">{{ menu|raw }} {{ header_toolbar|raw }}</div>
+                    <div class="collapse navbar-collapse" id="navbar-collapse-1">
+                        {{ menu|raw }}
+                        {{ header_toolbar|raw }}
+                    </div>
                 {% endblock %}
             </div>
         {% endblock %}
@@ -50,11 +55,13 @@
                         {% block eventinfo %}
                             {{ event_info|raw }}
                         {% endblock %}
-                        <a href="{{ faq_url }}">FAQ</a>
-                        · <a href="{{ contact_email }}"><span class="glyphicon glyphicon-envelope"></span> Contact</a>
+                        <a href="{{ config('faq_url') }}">FAQ</a>
+                        · <a href="{{ config('contact_email') }}">
+                            <span class="glyphicon glyphicon-envelope"></span>Contact
+                          </a>
                         · <a href="https://github.com/engelsystem/engelsystem/issues">Bugs / Features</a>
                         · <a href="https://github.com/engelsystem/engelsystem/">Development Platform</a>
-                        · <a href="{{ credits_url }}">Credits</a>
+                        · <a href="{{ url('credits') }}">Credits</a>
                     </div>
                 </div>
             {% endblock %}
@@ -69,7 +76,7 @@
     <script type="text/javascript" src="vendor/moment-with-locales.min.js"></script>
     <script type="text/javascript">
         $(function () {
-            moment.locale("{{ locale|escape('js') }}");
+            moment.locale("{{ session_get('locale')|escape('js') }}");
         });
     </script>
     <script type="text/javascript" src="js/moment-countdown.js"></script>
diff --git a/tests/Unit/Config/ConfigServiceProviderTest.php b/tests/Unit/Config/ConfigServiceProviderTest.php
index c8be4b7d..2e37d0da 100644
--- a/tests/Unit/Config/ConfigServiceProviderTest.php
+++ b/tests/Unit/Config/ConfigServiceProviderTest.php
@@ -23,8 +23,13 @@ class ConfigServiceProviderTest extends ServiceProviderTest
         Application::setInstance($app);
 
         $this->setExpects($app, 'make', [Config::class], $config);
-        $this->setExpects($app, 'instance', ['config', $config]);
         $this->setExpects($app, 'get', ['path.config'], __DIR__ . '/../../../config', $this->atLeastOnce());
+        $app->expects($this->exactly(2))
+            ->method('instance')
+            ->withConsecutive(
+                [Config::class, $config],
+                ['config', $config]
+            );
 
         $this->setExpects($config, 'set', null, null, $this->exactly(2));
         $this->setExpects($config, 'get', [null], []);
diff --git a/tests/Unit/Http/SessionServiceProviderTest.php b/tests/Unit/Http/SessionServiceProviderTest.php
index a78b4f72..d0125bc2 100644
--- a/tests/Unit/Http/SessionServiceProviderTest.php
+++ b/tests/Unit/Http/SessionServiceProviderTest.php
@@ -54,6 +54,7 @@ class SessionServiceProviderTest extends ServiceProviderTest
             ->method('instance')
             ->withConsecutive(
                 ['session.storage', $sessionStorage],
+                [Session::class, $session],
                 ['session', $session]
             );
 
@@ -88,10 +89,11 @@ class SessionServiceProviderTest extends ServiceProviderTest
                 $sessionStorage,
                 $session
             );
-        $app->expects($this->exactly(2))
+        $app->expects($this->exactly(3))
             ->method('instance')
             ->withConsecutive(
                 ['session.storage', $sessionStorage],
+                [Session::class, $session],
                 ['session', $session]
             );
 
diff --git a/tests/Unit/Http/UrlGeneratorServiceProviderTest.php b/tests/Unit/Http/UrlGeneratorServiceProviderTest.php
index f3d5e018..787789fe 100644
--- a/tests/Unit/Http/UrlGeneratorServiceProviderTest.php
+++ b/tests/Unit/Http/UrlGeneratorServiceProviderTest.php
@@ -21,7 +21,12 @@ class UrlGeneratorServiceProviderTest extends ServiceProviderTest
         $app = $this->getApp();
 
         $this->setExpects($app, 'make', [UrlGenerator::class], $urlGenerator);
-        $this->setExpects($app, 'instance', ['http.urlGenerator', $urlGenerator]);
+        $app->expects($this->exactly(2))
+            ->method('instance')
+            ->withConsecutive(
+                [UrlGenerator::class, $urlGenerator],
+                ['http.urlGenerator', $urlGenerator]
+            );
 
         $serviceProvider = new UrlGeneratorServiceProvider($app);
         $serviceProvider->register();
diff --git a/tests/Unit/Renderer/Twig/Extensions/ConfigTest.php b/tests/Unit/Renderer/Twig/Extensions/ConfigTest.php
new file mode 100644
index 00000000..6a9cb78a
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/ConfigTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use Engelsystem\Config\Config as EngelsystemConfig;
+use Engelsystem\Renderer\Twig\Extensions\Config;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class ConfigTest extends ExtensionTest
+{
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Config::__construct
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Config::getFunctions
+     */
+    public function testGetFunctions()
+    {
+        /** @var EngelsystemConfig|MockObject $config */
+        $config = $this->createMock(EngelsystemConfig::class);
+
+        $extension = new Config($config);
+        $functions = $extension->getFunctions();
+
+        $this->assertExtensionExists('config', [$config, 'get'], $functions);
+    }
+}
diff --git a/tests/Unit/Renderer/Twig/Extensions/ExtensionTest.php b/tests/Unit/Renderer/Twig/Extensions/ExtensionTest.php
new file mode 100644
index 00000000..10f2e69a
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/ExtensionTest.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use PHPUnit\Framework\TestCase;
+use Twig_Function as TwigFunction;
+
+abstract class ExtensionTest extends TestCase
+{
+    /**
+     * Assert that a twig function was registered
+     *
+     * @param string         $name
+     * @param callable       $callback
+     * @param TwigFunction[] $functions
+     */
+    protected function assertExtensionExists($name, $callback, $functions)
+    {
+        foreach ($functions as $function) {
+            if ($function->getName() != $name) {
+                continue;
+            }
+
+            $this->assertEquals($callback, $function->getCallable());
+            return;
+        }
+
+        $this->fail(sprintf('Function %s not found', $name));
+    }
+
+    /**
+     * Assert that a global exists
+     *
+     * @param string  $name
+     * @param mixed   $value
+     * @param mixed[] $globals
+     */
+    protected function assertGlobalsExists($name, $value, $globals)
+    {
+        if (isset($globals[$name])) {
+            $this->assertArraySubset([$name => $value], $globals);
+
+            return;
+        }
+
+        $this->fail(sprintf('Global %s not found', $name));
+    }
+}
diff --git a/tests/Unit/Renderer/Twig/Extensions/GlobalsTest.php b/tests/Unit/Renderer/Twig/Extensions/GlobalsTest.php
new file mode 100644
index 00000000..6cc3a4da
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/GlobalsTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use Engelsystem\Renderer\Twig\Extensions\Globals;
+
+class GlobalsTest extends ExtensionTest
+{
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Globals::getGlobals
+     */
+    public function testGetGlobals()
+    {
+        $extension = new Globals();
+        $globals = $extension->getGlobals();
+
+        $this->assertGlobalsExists('user', [], $globals);
+
+        global $user;
+        $user['foo'] = 'bar';
+
+        $globals = $extension->getGlobals();
+        $this->assertGlobalsExists('user', ['foo' => 'bar'], $globals);
+    }
+}
diff --git a/tests/Unit/Renderer/Twig/Extensions/SessionTest.php b/tests/Unit/Renderer/Twig/Extensions/SessionTest.php
new file mode 100644
index 00000000..7ce4dc3a
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/SessionTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use Engelsystem\Renderer\Twig\Extensions\Session;
+use PHPUnit\Framework\MockObject\MockObject;
+use Symfony\Component\HttpFoundation\Session\Session as SymfonySession;
+
+class SessionTest extends ExtensionTest
+{
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Session::__construct
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Session::getFunctions
+     */
+    public function testGetGlobals()
+    {
+        /** @var SymfonySession|MockObject $session */
+        $session = $this->createMock(SymfonySession::class);
+
+        $extension = new Session($session);
+        $functions = $extension->getFunctions();
+
+        $this->assertExtensionExists('session_get', [$session, 'get'], $functions);
+    }
+}
diff --git a/tests/Unit/Renderer/Twig/Extensions/UrlTest.php b/tests/Unit/Renderer/Twig/Extensions/UrlTest.php
new file mode 100644
index 00000000..c7e40bea
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/UrlTest.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use Engelsystem\Http\UrlGenerator;
+use Engelsystem\Renderer\Twig\Extensions\Url;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class UrlTest extends ExtensionTest
+{
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Url::__construct
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Url::getFunctions
+     */
+    public function testGetGlobals()
+    {
+        /** @var UrlGenerator|MockObject $urlGenerator */
+        $urlGenerator = $this->createMock(UrlGenerator::class);
+
+        $extension = new Url($urlGenerator);
+        $functions = $extension->getFunctions();
+
+        $this->assertExtensionExists('url', [$extension, 'getUrl'], $functions);
+    }
+
+    /**
+     * @return string[][]
+     */
+    public function getUrls()
+    {
+        return [
+            ['/', '/', 'http://foo.bar/'],
+            ['/foo', '/foo', 'http://foo.bar/foo'],
+            ['foo_bar', 'foo-bar', 'http://foo.bar/foo-bar'],
+            ['dolor', 'dolor', 'http://foo.bar/dolor?lorem_ipsum=dolor', ['lorem_ipsum' => 'dolor']],
+        ];
+    }
+
+    /**
+     * @dataProvider getUrls
+     *
+     * @param string $url
+     * @param string $return
+     * @param string $urlTo
+     * @param array  $parameters
+     *
+     * @covers       \Engelsystem\Renderer\Twig\Extensions\Url::getUrl
+     */
+    public function testGetUrl($url, $urlTo, $return, $parameters = [])
+    {
+        /** @var UrlGenerator|MockObject $urlGenerator */
+        $urlGenerator = $this->createMock(UrlGenerator::class);
+
+        $urlGenerator->expects($this->once())
+            ->method('to')
+            ->with($urlTo, $parameters)
+            ->willReturn($return);
+
+        $extension = new Url($urlGenerator);
+        $generatedUrl = $extension->getUrl($url, $parameters);
+
+        $this->assertEquals($return, $generatedUrl);
+    }
+}
diff --git a/tests/Unit/Renderer/TwigServiceProviderTest.php b/tests/Unit/Renderer/TwigServiceProviderTest.php
index ede6fae4..3cd0da4d 100644
--- a/tests/Unit/Renderer/TwigServiceProviderTest.php
+++ b/tests/Unit/Renderer/TwigServiceProviderTest.php
@@ -7,17 +7,90 @@ use Engelsystem\Renderer\TwigLoader;
 use Engelsystem\Renderer\TwigServiceProvider;
 use Engelsystem\Test\Unit\ServiceProviderTest;
 use PHPUnit\Framework\MockObject\MockObject;
+use ReflectionClass as Reflection;
+use stdClass;
 use Twig_Environment as Twig;
+use Twig_ExtensionInterface as ExtensionInterface;
 use Twig_LoaderInterface as TwigLoaderInterface;
 
 class TwigServiceProviderTest extends ServiceProviderTest
 {
     /**
      * @covers \Engelsystem\Renderer\TwigServiceProvider::register
-     * @covers \Engelsystem\Renderer\TwigServiceProvider::registerTwigEngine
+     * @covers \Engelsystem\Renderer\TwigServiceProvider::registerTwigExtensions
      */
     public function testRegister()
     {
+        $app = $this->getApp(['make', 'instance', 'tag']);
+        $class = $this->createMock(stdClass::class);
+
+        $className = 'Foo\Bar\Class';
+        $classAlias = 'twig.extension.foo';
+
+        $app->expects($this->once())
+            ->method('make')
+            ->with('Foo\Bar\Class')
+            ->willReturn($class);
+
+        $app->expects($this->exactly(2))
+            ->method('instance')
+            ->withConsecutive(
+                [$className, $class],
+                [$classAlias, $class]
+            );
+
+        $app->expects($this->once())
+            ->method('tag')
+            ->with($classAlias, ['twig.extension']);
+
+        /** @var TwigServiceProvider|MockObject $serviceProvider */
+        $serviceProvider = $this->getMockBuilder(TwigServiceProvider::class)
+            ->setConstructorArgs([$app])
+            ->setMethods(['registerTwigEngine'])
+            ->getMock();
+        $serviceProvider->expects($this->once())
+            ->method('registerTwigEngine');
+        $this->setExtensionsTo($serviceProvider, ['foo' => 'Foo\Bar\Class']);
+
+        $serviceProvider->register();
+    }
+
+    /**
+     * @covers \Engelsystem\Renderer\TwigServiceProvider::boot
+     */
+    public function testBoot()
+    {
+        /** @var Twig|MockObject $twig */
+        $twig = $this->createMock(Twig::class);
+        /** @var ExtensionInterface|MockObject $firsExtension */
+        $firsExtension = $this->getMockForAbstractClass(ExtensionInterface::class);
+        /** @var ExtensionInterface|MockObject $secondExtension */
+        $secondExtension = $this->getMockForAbstractClass(ExtensionInterface::class);
+
+        $app = $this->getApp(['get', 'tagged']);
+
+        $app->expects($this->once())
+            ->method('get')
+            ->with('twig.environment')
+            ->willReturn($twig);
+        $app->expects($this->once())
+            ->method('tagged')
+            ->with('twig.extension')
+            ->willReturn([$firsExtension, $secondExtension]);
+
+        $twig->expects($this->exactly(2))
+            ->method('addExtension')
+            ->withConsecutive($firsExtension, $secondExtension);
+
+        $serviceProvider = new TwigServiceProvider($app);
+        $serviceProvider->boot();
+    }
+
+    /**
+     * @covers \Engelsystem\Renderer\TwigServiceProvider::registerTwigEngine
+     */
+    public function testRegisterTWigEngine()
+    {
         /** @var TwigEngine|MockObject $htmlEngine */
         $twigEngine = $this->createMock(TwigEngine::class);
         /** @var TwigLoader|MockObject $twigLoader */
@@ -41,12 +114,14 @@ class TwigServiceProviderTest extends ServiceProviderTest
                 $twigEngine
             );
 
-        $app->expects($this->exactly(4))
+        $app->expects($this->exactly(6))
             ->method('instance')
             ->withConsecutive(
                 [TwigLoader::class, $twigLoader],
                 [TwigLoaderInterface::class, $twigLoader],
+                ['twig.loader', $twigLoader],
                 [Twig::class, $twig],
+                ['twig.environment', $twig],
                 ['renderer.twigEngine', $twigEngine]
             );
 
@@ -58,6 +133,23 @@ class TwigServiceProviderTest extends ServiceProviderTest
         $this->setExpects($app, 'tag', ['renderer.twigEngine', ['renderer.engine']]);
 
         $serviceProvider = new TwigServiceProvider($app);
+        $this->setExtensionsTo($serviceProvider, []);
+
         $serviceProvider->register();
     }
+
+    /**
+     * @param TwigServiceProvider $serviceProvider
+     * @param array               $extensions
+     * @throws \ReflectionException
+     */
+    protected function setExtensionsTo($serviceProvider, $extensions)
+    {
+        $reflection = new Reflection(get_class($serviceProvider));
+
+        $property = $reflection->getProperty('extensions');
+        $property->setAccessible(true);
+
+        $property->setValue($serviceProvider, $extensions);
+    }
 }