Merge remote-tracking branch 'MyIgel/templating'

21 files changed, 938 insertions, 7 deletions

diff --git a/tests/Unit/ApplicationTest.php b/tests/Unit/ApplicationTest.php
index 866eb957..012226b2 100644
--- a/tests/Unit/ApplicationTest.php
+++ b/tests/Unit/ApplicationTest.php
@@ -48,6 +48,7 @@ class ApplicationTest extends TestCase
         $this->assertTrue($app->has('path'));
         $this->assertTrue($app->has('path.config'));
         $this->assertTrue($app->has('path.lang'));
+        $this->assertTrue($app->has('path.views'));
 
         $this->assertEquals(realpath('.'), $app->path());
         $this->assertEquals(realpath('.') . '/config', $app->get('path.config'));
diff --git a/tests/Unit/Config/ConfigServiceProviderTest.php b/tests/Unit/Config/ConfigServiceProviderTest.php
index 998c0ba1..925854be 100644
--- a/tests/Unit/Config/ConfigServiceProviderTest.php
+++ b/tests/Unit/Config/ConfigServiceProviderTest.php
@@ -24,8 +24,13 @@ class ConfigServiceProviderTest extends ServiceProviderTest
         Application::setInstance($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));
         $config->expects($this->exactly(3))
@@ -60,7 +65,12 @@ class ConfigServiceProviderTest extends ServiceProviderTest
         Application::setInstance($app);
 
         $this->setExpects($app, 'make', [Config::class], $config);
-        $this->setExpects($app, 'instance', ['config', $config]);
+        $app->expects($this->exactly(2))
+            ->method('instance')
+            ->withConsecutive(
+              [Config::class, $config],
+              ['config', $config]
+            );
         $this->setExpects($app, 'get', ['path.config'], __DIR__ . '/not_existing', $this->atLeastOnce());
 
         $this->setExpects($config, 'set', null, null, $this->never());
diff --git a/tests/Unit/Helpers/TranslationServiceProviderTest.php b/tests/Unit/Helpers/TranslationServiceProviderTest.php
new file mode 100644
index 00000000..c5ba7386
--- /dev/null
+++ b/tests/Unit/Helpers/TranslationServiceProviderTest.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Helpers;
+
+use Engelsystem\Config\Config;
+use Engelsystem\Helpers\TranslationServiceProvider;
+use Engelsystem\Helpers\Translator;
+use Engelsystem\Test\Unit\ServiceProviderTest;
+use PHPUnit\Framework\MockObject\MockObject;
+use Symfony\Component\HttpFoundation\Session\Session;
+
+class TranslationServiceProviderTest extends ServiceProviderTest
+{
+    /**
+     * @covers \Engelsystem\Helpers\TranslationServiceProvider::register()
+     */
+    public function testRegister()
+    {
+        $app = $this->getApp(['make', 'instance', 'get']);
+        /** @var Config|MockObject $config */
+        $config = $this->createMock(Config::class);
+        /** @var Session|MockObject $session */
+        $session = $this->createMock(Session::class);
+        /** @var Translator|MockObject $translator */
+        $translator = $this->createMock(Translator::class);
+
+        /** @var TranslationServiceProvider|MockObject $serviceProvider */
+        $serviceProvider = $this->getMockBuilder(TranslationServiceProvider::class)
+            ->setConstructorArgs([$app])
+            ->setMethods(['initGettext', 'setLocale'])
+            ->getMock();
+
+        $serviceProvider->expects($this->once())
+            ->method('initGettext');
+
+        $app->expects($this->exactly(2))
+            ->method('get')
+            ->withConsecutive(['config'], ['session'])
+            ->willReturnOnConsecutiveCalls($config, $session);
+
+        $defaultLocale = 'fo_OO';
+        $locale = 'te_ST.WTF-9';
+        $locales = ['fo_OO' => 'Foo', 'fo_OO.BAR' => 'Foo (Bar)', 'te_ST.WTF-9' => 'WTF\'s Testing?'];
+        $config->expects($this->exactly(2))
+            ->method('get')
+            ->withConsecutive(
+                ['locales'],
+                ['default_locale']
+            )
+            ->willReturnOnConsecutiveCalls(
+                $locales,
+                $defaultLocale
+            );
+
+        $session->expects($this->once())
+            ->method('get')
+            ->with('locale', $defaultLocale)
+            ->willReturn($locale);
+        $session->expects($this->once())
+            ->method('set')
+            ->with('locale', $locale);
+
+        $app->expects($this->once())
+            ->method('make')
+            ->with(
+                Translator::class,
+                [
+                    'locale'               => $locale,
+                    'locales'              => $locales,
+                    'localeChangeCallback' => [$serviceProvider, 'setLocale']
+                ]
+            )
+            ->willReturn($translator);
+
+        $app->expects($this->exactly(2))
+            ->method('instance')
+            ->withConsecutive(
+                [Translator::class, $translator],
+                ['translator', $translator]
+            );
+
+        $serviceProvider->register();
+    }
+}
+
+
diff --git a/tests/Unit/Helpers/TranslatorTest.php b/tests/Unit/Helpers/TranslatorTest.php
new file mode 100644
index 00000000..396d2b65
--- /dev/null
+++ b/tests/Unit/Helpers/TranslatorTest.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Helpers;
+
+use Engelsystem\Helpers\Translator;
+use Engelsystem\Test\Unit\ServiceProviderTest;
+use PHPUnit\Framework\MockObject\MockObject;
+use stdClass;
+
+class TranslatorTest extends ServiceProviderTest
+{
+    /**
+     * @covers \Engelsystem\Helpers\Translator::__construct()
+     * @covers \Engelsystem\Helpers\Translator::setLocale()
+     * @covers \Engelsystem\Helpers\Translator::setLocales()
+     * @covers \Engelsystem\Helpers\Translator::getLocale()
+     * @covers \Engelsystem\Helpers\Translator::getLocales()
+     * @covers \Engelsystem\Helpers\Translator::hasLocale()
+     */
+    public function testInit()
+    {
+        $locales = ['te_ST.ER-01' => 'Tests', 'fo_OO' => 'SomeFOO'];
+        $locale = 'te_ST.ER-01';
+
+        /** @var callable|MockObject $callable */
+        $callable = $this->getMockBuilder(stdClass::class)
+            ->setMethods(['__invoke'])
+            ->getMock();
+        $callable->expects($this->exactly(2))
+            ->method('__invoke')
+            ->withConsecutive(['te_ST.ER-01'], ['fo_OO']);
+
+        $translator = new Translator($locale, $locales, $callable);
+
+        $this->assertEquals($locales, $translator->getLocales());
+        $this->assertEquals($locale, $translator->getLocale());
+
+        $translator->setLocale('fo_OO');
+        $this->assertEquals('fo_OO', $translator->getLocale());
+
+        $newLocales = ['lo_RM' => 'Lorem', 'ip_SU-M' => 'Ipsum'];
+        $translator->setLocales($newLocales);
+        $this->assertEquals($newLocales, $translator->getLocales());
+
+        $this->assertTrue($translator->hasLocale('ip_SU-M'));
+        $this->assertFalse($translator->hasLocale('te_ST.ER-01'));
+    }
+
+    /**
+     * @covers \Engelsystem\Helpers\Translator::translate()
+     */
+    public function testTranslate()
+    {
+        /** @var Translator|MockObject $translator */
+        $translator = $this->getMockBuilder(Translator::class)
+            ->setConstructorArgs(['de_DE.UTF-8', ['de_DE.UTF-8' => 'Deutsch']])
+            ->setMethods(['translateGettext'])
+            ->getMock();
+        $translator->expects($this->once())
+            ->method('translateGettext')
+            ->with('My favourite number is %u!')
+            ->willReturn('Meine Lieblingszahl ist die %u!');
+
+        $return = $translator->translate('My favourite number is %u!', [3]);
+        $this->assertEquals('Meine Lieblingszahl ist die 3!', $return);
+    }
+}
+
+
diff --git a/tests/Unit/HelpersTest.php b/tests/Unit/HelpersTest.php
index fb9e6f00..b9cedd30 100644
--- a/tests/Unit/HelpersTest.php
+++ b/tests/Unit/HelpersTest.php
@@ -5,10 +5,10 @@ namespace Engelsystem\Test\Unit;
 use Engelsystem\Application;
 use Engelsystem\Config\Config;
 use Engelsystem\Container\Container;
+use Engelsystem\Helpers\Translator;
 use Engelsystem\Http\Request;
 use Engelsystem\Http\Response;
 use Engelsystem\Renderer\Renderer;
-use Engelsystem\Http\UrlGenerator;
 use Engelsystem\Http\UrlGeneratorInterface;
 use PHPUnit\Framework\TestCase;
 use PHPUnit_Framework_MockObject_MockObject as MockObject;
@@ -196,6 +196,29 @@ class HelpersTest extends TestCase
     }
 
     /**
+     * @covers \__
+     * @covers \trans
+     */
+    public function testTrans()
+    {
+        /** @var Translator|MockObject $translator */
+        $translator = $this->getMockBuilder(Translator::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $this->getAppMock('translator', $translator);
+
+        $translator->expects($this->exactly(2))
+            ->method('translate')
+            ->with('Lorem %s Ipsum', ['foo'])
+            ->willReturn('Lorem foo Ipsum');
+
+        $this->assertEquals($translator, trans());
+        $this->assertEquals('Lorem foo Ipsum', trans('Lorem %s Ipsum', ['foo']));
+        $this->assertEquals('Lorem foo Ipsum', __('Lorem %s Ipsum', ['foo']));
+    }
+
+    /**
      * @covers \url
      */
     public function testUrl()
diff --git a/tests/Unit/Http/ResponseTest.php b/tests/Unit/Http/ResponseTest.php
index f6c24767..d7dc37c0 100644
--- a/tests/Unit/Http/ResponseTest.php
+++ b/tests/Unit/Http/ResponseTest.php
@@ -3,6 +3,8 @@
 namespace Engelsystem\Test\Unit\Http;
 
 use Engelsystem\Http\Response;
+use Engelsystem\Renderer\Renderer;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ResponseInterface;
 use Symfony\Component\HttpFoundation\Response as SymfonyResponse;
@@ -46,4 +48,37 @@ class ResponseTest extends TestCase
         $this->assertNotEquals($response, $newResponse);
         $this->assertEquals('Lorem Ipsum?', $newResponse->getContent());
     }
-}
+
+    /**
+     * @covers \Engelsystem\Http\Response::withView
+     */
+    public function testWithView()
+    {
+        /** @var REnderer|MockObject $renderer */
+        $renderer = $this->createMock(Renderer::class);
+
+        $renderer->expects($this->once())
+            ->method('render')
+            ->with('foo', ['lorem' => 'ipsum'])
+            ->willReturn('Foo ipsum!');
+
+        $response = new Response('', 200, [], $renderer);
+        $newResponse = $response->withView('foo', ['lorem' => 'ipsum'], 505, ['test' => 'er']);
+
+        $this->assertNotEquals($response, $newResponse);
+        $this->assertEquals('Foo ipsum!', $newResponse->getContent());
+        $this->assertEquals(505, $newResponse->getStatusCode());
+        $this->assertArraySubset(['test' => ['er']], $newResponse->getHeaders());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Response::withView
+     */
+    public function testWithViewNoRenderer()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        $response = new Response();
+        $response->withView('foo');
+    }
+}
\ No newline at end of file
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 874268b0..720af631 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/Middleware/ErrorHandlerTest.php b/tests/Unit/Middleware/ErrorHandlerTest.php
new file mode 100644
index 00000000..abf9c52f
--- /dev/null
+++ b/tests/Unit/Middleware/ErrorHandlerTest.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Http\Response;
+use Engelsystem\Middleware\ErrorHandler;
+use Engelsystem\Test\Unit\Middleware\Stub\ReturnResponseMiddlewareHandler;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Twig_LoaderInterface as TwigLoader;
+
+class ErrorHandlerTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\ErrorHandler::__construct
+     * @covers \Engelsystem\Middleware\ErrorHandler::process
+     * @covers \Engelsystem\Middleware\ErrorHandler::selectView
+     */
+    public function testProcess()
+    {
+        /** @var TwigLoader|MockObject $twigLoader */
+        $twigLoader = $this->createMock(TwigLoader::class);
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $psrResponse */
+        $psrResponse = $this->getMockForAbstractClass(ResponseInterface::class);
+        $returnResponseHandler = new ReturnResponseMiddlewareHandler($psrResponse);
+
+        $psrResponse->expects($this->once())
+            ->method('getStatusCode')
+            ->willReturn(505);
+
+        $errorHandler = new ErrorHandler($twigLoader);
+
+        $return = $errorHandler->process($request, $returnResponseHandler);
+        $this->assertEquals($psrResponse, $return, 'Plain PSR-7 Response should be passed directly');
+
+        /** @var Response|MockObject $response */
+        $response = $this->createMock(Response::class);
+
+        $response->expects($this->exactly(3))
+            ->method('getStatusCode')
+            ->willReturnOnConsecutiveCalls(
+                200,
+                418,
+                505
+            );
+
+        $returnResponseHandler->setResponse($response);
+        $return = $errorHandler->process($request, $returnResponseHandler);
+        $this->assertEquals($response, $return, 'Only Responses >= 400 should be processed');
+
+        $twigLoader->expects($this->exactly(4))
+            ->method('exists')
+            ->withConsecutive(
+                ['errors/418'],
+                ['errors/4'],
+                ['errors/400'],
+                ['errors/505']
+            )
+            ->willReturnOnConsecutiveCalls(
+                false,
+                false,
+                false,
+                true
+            );
+
+        $response->expects($this->exactly(2))
+            ->method('getContent')
+            ->willReturnOnConsecutiveCalls(
+                'Teapot',
+                'Internal Error!'
+            );
+
+        $response->expects($this->exactly(2))
+            ->method('withView')
+            ->withConsecutive(
+                ['errors/default', ['status' => 418, 'content' => 'Teapot'], 418],
+                ['errors/505', ['status' => 505, 'content' => 'Internal Error!'], 505]
+            )
+            ->willReturn($response);
+
+        $errorHandler->process($request, $returnResponseHandler);
+        $errorHandler->process($request, $returnResponseHandler);
+    }
+}
diff --git a/tests/Unit/Middleware/SetLocaleTest.php b/tests/Unit/Middleware/SetLocaleTest.php
new file mode 100644
index 00000000..c4e9d2a4
--- /dev/null
+++ b/tests/Unit/Middleware/SetLocaleTest.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Helpers\Translator;
+use Engelsystem\Middleware\SetLocale;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Symfony\Component\HttpFoundation\Session\Session;
+
+class SetLocaleTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\SetLocale::__construct
+     * @covers \Engelsystem\Middleware\SetLocale::process
+     */
+    public function testRegister()
+    {
+        /** @var Translator|MockObject $translator */
+        $translator = $this->createMock(Translator::class);
+        /** @var Session|MockObject $session */
+        $session = $this->createMock(Session::class);
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->getMockForAbstractClass(ServerRequestInterface::class);
+        /** @var RequestHandlerInterface|MockObject $handler */
+        $handler = $this->getMockForAbstractClass(RequestHandlerInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->getMockForAbstractClass(ResponseInterface::class);
+
+        $locale = 'te_ST.UTF8';
+
+        $request->expects($this->exactly(3))
+            ->method('getQueryParams')
+            ->willReturnOnConsecutiveCalls(
+                [],
+                ['set-locale' => 'en_US.UTF8'],
+                ['set-locale' => $locale]
+            );
+
+        $translator->expects($this->exactly(2))
+            ->method('hasLocale')
+            ->withConsecutive(
+                ['en_US.UTF8'],
+                [$locale]
+            )
+            ->willReturnOnConsecutiveCalls(
+                false,
+                true
+            );
+        $translator->expects($this->once())
+            ->method('setLocale')
+            ->with($locale);
+
+        $session->expects($this->once())
+            ->method('set')
+            ->with('locale', $locale);
+
+        $handler->expects($this->exactly(3))
+            ->method('handle')
+            ->with($request)
+            ->willReturn($response);
+
+        $middleware = new SetLocale($translator, $session);
+        $middleware->process($request, $handler);
+        $middleware->process($request, $handler);
+        $middleware->process($request, $handler);
+    }
+}
diff --git a/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php b/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
index 323e07b4..370187dd 100644
--- a/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
+++ b/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
@@ -27,4 +27,14 @@ class ReturnResponseMiddlewareHandler implements RequestHandlerInterface
     {
         return $this->response;
     }
+
+    /**
+     * Set the response
+     *
+     * @param ResponseInterface $response
+     */
+    public function setResponse(ResponseInterface $response)
+    {
+        $this->response = $response;
+    }
 }
diff --git a/tests/Unit/Renderer/RendererServiceProviderTest.php b/tests/Unit/Renderer/RendererServiceProviderTest.php
index 3826da7e..6cdf4363 100644
--- a/tests/Unit/Renderer/RendererServiceProviderTest.php
+++ b/tests/Unit/Renderer/RendererServiceProviderTest.php
@@ -37,10 +37,12 @@ class RendererServiceProviderTest extends ServiceProviderTest
                 $htmlEngine
             );
 
-        $app->expects($this->exactly(2))
+        $app->expects($this->exactly(4))
             ->method('instance')
             ->withConsecutive(
+                [Renderer::class, $renderer],
                 ['renderer', $renderer],
+                [HtmlEngine::class, $htmlEngine],
                 ['renderer.htmlEngine', $htmlEngine]
             );
 
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..e1c5a378
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/ExtensionTest.php
@@ -0,0 +1,84 @@
+<?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 filter was registered
+     *
+     * @param string         $name
+     * @param callable       $callback
+     * @param TwigFunction[] $functions
+     */
+    protected function assertFilterExists($name, $callback, $functions)
+    {
+        foreach ($functions as $function) {
+            if ($function->getName() != $name) {
+                continue;
+            }
+
+            $this->assertEquals($callback, $function->getCallable());
+            return;
+        }
+
+        $this->fail(sprintf('Filter %s not found', $name));
+    }
+
+    /**
+     * 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));
+    }
+
+    /**
+     * Assert that a token parser was set
+     *
+     * @param $tokenParser
+     * @param $tokenParsers
+     */
+    protected function assertTokenParserExists($tokenParser, $tokenParsers)
+    {
+        $this->assertArraySubset(
+            [$tokenParser],
+            $tokenParsers,
+            sprintf('Token parser %s not found', get_class($tokenParser))
+        );
+    }
+}
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/TranslationTest.php b/tests/Unit/Renderer/Twig/Extensions/TranslationTest.php
new file mode 100644
index 00000000..f1548604
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/TranslationTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use Engelsystem\Helpers\Translator;
+use Engelsystem\Renderer\Twig\Extensions\Translation;
+use PHPUnit\Framework\MockObject\MockObject;
+use Twig_Extensions_TokenParser_Trans as TranslationTokenParser;
+
+class TranslationTest extends ExtensionTest
+{
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Translation::__construct
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Translation::getFilters
+     */
+    public function testGeFilters()
+    {
+        /** @var Translator|MockObject $translator */
+        $translator = $this->createMock(Translator::class);
+        /** @var TranslationTokenParser|MockObject $parser */
+        $parser = $this->createMock(TranslationTokenParser::class);
+
+        $extension = new Translation($translator, $parser);
+        $filters = $extension->getFilters();
+
+        $this->assertExtensionExists('trans', [$translator, 'translate'], $filters);
+    }
+
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Translation::getFunctions
+     */
+    public function testGetFunctions()
+    {
+        /** @var Translator|MockObject $translator */
+        $translator = $this->createMock(Translator::class);
+        /** @var TranslationTokenParser|MockObject $parser */
+        $parser = $this->createMock(TranslationTokenParser::class);
+
+        $extension = new Translation($translator, $parser);
+        $functions = $extension->getFunctions();
+
+        $this->assertExtensionExists('__', [$translator, 'translate'], $functions);
+    }
+
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Translation::getTokenParsers
+     */
+    public function testGetTokenParsers()
+    {
+        /** @var Translator|MockObject $translator */
+        $translator = $this->createMock(Translator::class);
+        /** @var TranslationTokenParser|MockObject $parser */
+        $parser = $this->createMock(TranslationTokenParser::class);
+
+        $extension = new Translation($translator, $parser);
+        $tokenParsers = $extension->getTokenParsers();
+
+        $this->assertTokenParserExists($parser, $tokenParsers);
+    }
+}
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/TwigEngineTest.php b/tests/Unit/Renderer/TwigEngineTest.php
new file mode 100644
index 00000000..9d0618f1
--- /dev/null
+++ b/tests/Unit/Renderer/TwigEngineTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer;
+
+use Engelsystem\Renderer\TwigEngine;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Twig_Environment as Twig;
+use Twig_LoaderInterface as LoaderInterface;
+
+class TwigEngineTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Renderer\TwigEngine::__construct
+     * @covers \Engelsystem\Renderer\TwigEngine::get
+     */
+    public function testGet()
+    {
+        /** @var Twig|MockObject $twig */
+        $twig = $this->createMock(Twig::class);
+
+        $path = 'foo.twig';
+        $data = ['lorem' => 'ipsum'];
+
+        $twig->expects($this->once())
+            ->method('render')
+            ->with($path, $data)
+            ->willReturn('LoremIpsum!');
+
+        $engine = new TwigEngine($twig);
+        $return = $engine->get($path, $data);
+        $this->assertEquals('LoremIpsum!', $return);
+    }
+
+
+    /**
+     * @covers \Engelsystem\Renderer\TwigEngine::canRender
+     */
+    public function testCanRender()
+    {
+        /** @var Twig|MockObject $twig */
+        $twig = $this->createMock(Twig::class);
+        /** @var LoaderInterface|MockObject $loader */
+        $loader = $this->getMockForAbstractClass(LoaderInterface::class);
+
+        $path = 'foo.twig';
+
+        $twig->expects($this->once())
+            ->method('getLoader')
+            ->willReturn($loader);
+        $loader->expects($this->once())
+            ->method('exists')
+            ->with($path)
+            ->willReturn(true);
+
+        $engine = new TwigEngine($twig);
+        $return = $engine->canRender($path);
+        $this->assertTrue($return);
+    }
+}
diff --git a/tests/Unit/Renderer/TwigLoaderTest.php b/tests/Unit/Renderer/TwigLoaderTest.php
new file mode 100644
index 00000000..e6867643
--- /dev/null
+++ b/tests/Unit/Renderer/TwigLoaderTest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer;
+
+use Engelsystem\Renderer\TwigLoader;
+use PHPUnit\Framework\TestCase;
+use ReflectionClass as Reflection;
+
+class TwigLoaderTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Renderer\TwigLoader::findTemplate
+     */
+    public function testFindTemplate()
+    {
+        $loader = new TwigLoader();
+
+        $reflection = new Reflection(get_class($loader));
+        $property = $reflection->getProperty('cache');
+        $property->setAccessible(true);
+
+        $realPath = __DIR__ . '/Stub/foo.twig';
+        $property->setValue($loader, ['Stub/foo.twig' => $realPath]);
+
+        $return = $loader->findTemplate('Stub/foo.twig');
+        $this->assertEquals($realPath, $return);
+
+        $return = $loader->findTemplate('Stub/foo');
+        $this->assertEquals($realPath, $return);
+    }
+}
diff --git a/tests/Unit/Renderer/TwigServiceProviderTest.php b/tests/Unit/Renderer/TwigServiceProviderTest.php
new file mode 100644
index 00000000..3cd0da4d
--- /dev/null
+++ b/tests/Unit/Renderer/TwigServiceProviderTest.php
@@ -0,0 +1,155 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer;
+
+use Engelsystem\Renderer\TwigEngine;
+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::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 */
+        $twigLoader = $this->createMock(TwigLoader::class);
+        /** @var Twig|MockObject $twig */
+        $twig = $this->createMock(Twig::class);
+
+        $app = $this->getApp(['make', 'instance', 'tag', 'get']);
+
+        $viewsPath = __DIR__ . '/Stub';
+
+        $app->expects($this->exactly(3))
+            ->method('make')
+            ->withConsecutive(
+                [TwigLoader::class, ['paths' => $viewsPath]],
+                [Twig::class],
+                [TwigEngine::class]
+            )->willReturnOnConsecutiveCalls(
+                $twigLoader,
+                $twig,
+                $twigEngine
+            );
+
+        $app->expects($this->exactly(6))
+            ->method('instance')
+            ->withConsecutive(
+                [TwigLoader::class, $twigLoader],
+                [TwigLoaderInterface::class, $twigLoader],
+                ['twig.loader', $twigLoader],
+                [Twig::class, $twig],
+                ['twig.environment', $twig],
+                ['renderer.twigEngine', $twigEngine]
+            );
+
+        $app->expects($this->once())
+            ->method('get')
+            ->with('path.views')
+            ->willReturn($viewsPath);
+
+        $this->setExpects($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);
+    }
+}