diff --git a/tests/Forward/ApplicationTest.php b/tests/Forward/ApplicationTest.php
new file mode 100644
index 00000000..7d270901
--- /dev/null
+++ b/tests/Forward/ApplicationTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Rougin\Slytherin\Forward;
+
+use Rougin\Slytherin\Forward\Fixture\Builder;
+use Rougin\Slytherin\Testcase;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class ApplicationTest extends Testcase
+{
+    /**
+     * @var \Rougin\Slytherin\Forward\Fixture\Builder
+     */
+    protected $builder;
+
+    protected function doSetUp()
+    {
+        $this->builder = new Builder;
+    }
+
+    /**
+     * @runInSeparateProcess
+     *
+     * @return void
+     */
+    public function test_run_with_404_error()
+    {
+        $this->builder->setUrl('GET', '/');
+
+        $this->builder->make()->run();
+
+        $response = http_response_code();
+
+        $this->assertEquals(404, $response);
+    }
+
+    /**
+     * @runInSeparateProcess
+     *
+     * @return void
+     */
+    public function test_run_with_sample_text()
+    {
+        $builder = new Builder;
+
+        $builder->setUrl('GET', '/v1/hello');
+
+        $this->expectOutputString('Hello world!');
+
+        $builder->make()->run();
+    }
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Builder.php b/tests/Forward/Fixture/Builder.php
new file mode 100644
index 00000000..c1877c3f
--- /dev/null
+++ b/tests/Forward/Fixture/Builder.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture;
+
+use Rougin\Slytherin\Application;
+use Rougin\Slytherin\Configuration;
+use Rougin\Slytherin\Container\Container;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class Builder
+{
+    protected $cookies = array();
+
+    protected $files = array();
+
+    protected $query = array();
+
+    protected $parsed = array();
+
+    protected $server = array();
+
+    public function make()
+    {
+        $config = new Configuration;
+
+        $config->load(__DIR__ . '/Config');
+
+        $config->set('app.http.cookies', $this->cookies);
+        $config->set('app.http.files', $this->files);
+        $config->set('app.http.get', $this->query);
+        $config->set('app.http.post', $this->parsed);
+        $config->set('app.http.server', $this->server);
+
+        $container = new Container;
+
+        $app = new Application($container, $config);
+
+        $items = $config->get('app.packages');
+
+        return $app->integrate($items);
+    }
+
+    public function setCookies($cookies)
+    {
+        $this->cookies = $cookies;
+
+        return $this;
+    }
+
+    public function setFiles($files)
+    {
+        $this->files = $files;
+
+        return $this;
+    }
+
+    public function setQuery($query)
+    {
+        $this->query = $query;
+
+        return $this;
+    }
+
+    public function setParsed($parsed)
+    {
+        $this->parsed = $parsed;
+
+        return $this;
+    }
+
+    public function setServer($server)
+    {
+        $this->server = $server;
+
+        return $this;
+    }
+
+    public function setUrl($method, $uri)
+    {
+        $this->server['REQUEST_METHOD'] = $method;
+
+        $this->server['REQUEST_URI'] = $uri;
+
+        $this->server['SERVER_NAME'] = 'localhost';
+
+        $this->server['SERVER_PORT'] = '8000';
+
+        return $this;
+    }
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Config/app.php b/tests/Forward/Fixture/Config/app.php
new file mode 100644
index 00000000..70b2edc1
--- /dev/null
+++ b/tests/Forward/Fixture/Config/app.php
@@ -0,0 +1,44 @@
+<?php
+
+use Rougin\Slytherin\Forward\Fixture\Router;
+
+return
+[
+    'name' => 'Slytherin',
+
+    'base_url' => 'http://localhost:8000',
+
+    'environment' => 'development',
+
+    'timezone' => 'Asia/Manila',
+
+    'http' =>
+    [
+        'cookies' => array(),
+
+        'files' => array(),
+
+        'get' => array(),
+
+        'post' => array(),
+
+        'server' => array(),
+    ],
+
+    'router' => new Router,
+
+    'middlewares' => [],
+
+    'packages' =>
+    [
+        // Testing Packages ---------------------------------------
+        'Rougin\Slytherin\Forward\Fixture\Packages\HttpPackage',
+        'Rougin\Slytherin\Forward\Fixture\Packages\RoutingPackage',
+        // --------------------------------------------------------
+
+        // Slytherin Integrations ------------------------------
+        'Rougin\Slytherin\Integration\ConfigurationIntegration',
+        'Rougin\Slytherin\Middleware\MiddlewareIntegration',
+        // -----------------------------------------------------
+    ],
+];
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Packages/HttpPackage.php b/tests/Forward/Fixture/Packages/HttpPackage.php
new file mode 100644
index 00000000..eb18b08b
--- /dev/null
+++ b/tests/Forward/Fixture/Packages/HttpPackage.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture\Packages;
+
+use Rougin\Slytherin\Http\HttpIntegration;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class HttpPackage extends HttpIntegration
+{
+    protected $preferred = 'slytherin';
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Packages/RoutingPackage.php b/tests/Forward/Fixture/Packages/RoutingPackage.php
new file mode 100644
index 00000000..50ac9003
--- /dev/null
+++ b/tests/Forward/Fixture/Packages/RoutingPackage.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture\Packages;
+
+use Rougin\Slytherin\Routing\RoutingIntegration;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class RoutingPackage extends RoutingIntegration
+{
+    protected $preferred = 'slytherin';
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Router.php b/tests/Forward/Fixture/Router.php
new file mode 100644
index 00000000..9fe62396
--- /dev/null
+++ b/tests/Forward/Fixture/Router.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture;
+
+use Rougin\Slytherin\Routing\Router as Slytherin;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class Router extends Slytherin
+{
+    protected $namespace = 'Rougin\Slytherin\Forward\Fixture\Routes\\';
+
+    protected $prefix = '/';
+
+    public function routes($parsed = false)
+    {
+        // Default routes ------------------
+        $this->get('/v1/hello', 'Hello@index');
+        $this->get('/', 'Home@index');
+        // ---------------------------------
+
+        return parent::routes($parsed);
+    }
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Routes/Hello.php b/tests/Forward/Fixture/Routes/Hello.php
new file mode 100644
index 00000000..9e30a8a2
--- /dev/null
+++ b/tests/Forward/Fixture/Routes/Hello.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture\Routes;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class Hello extends Route
+{
+    /**
+     * @return \Psr\Http\Message\ResponseInterface
+     */
+    public function index()
+    {
+        $this->response->getBody()->write('Hello world!');
+
+        return $this->response;
+    }
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Routes/Home.php b/tests/Forward/Fixture/Routes/Home.php
new file mode 100644
index 00000000..6dd961c5
--- /dev/null
+++ b/tests/Forward/Fixture/Routes/Home.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture\Routes;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class Home extends Route
+{
+    /**
+     * @return \Psr\Http\Message\ResponseInterface
+     */
+    public function index()
+    {
+        return $this->response->withStatus(404);
+    }
+}
\ No newline at end of file
diff --git a/tests/Forward/Fixture/Routes/Route.php b/tests/Forward/Fixture/Routes/Route.php
new file mode 100644
index 00000000..2b3f7f3c
--- /dev/null
+++ b/tests/Forward/Fixture/Routes/Route.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Rougin\Slytherin\Forward\Fixture\Routes;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+/**
+ * @package Slytherin
+ * @author  Rougin Gutib <rougingutib@gmail.com>
+ */
+class Route
+{
+    /**
+     * @var \Psr\Http\Message\ServerRequestInterface
+     */
+    protected $request;
+
+    /**
+     * @var \Psr\Http\Message\ResponseInterface
+     */
+    protected $response;
+
+    /**
+     * Initializes the controller instance.
+     *
+     * @param \Psr\Http\Message\ServerRequestInterface $request
+     * @param \Psr\Http\Message\ResponseInterface      $response
+     */
+    public function __construct(ServerRequestInterface $request, ResponseInterface $response)
+    {
+        $this->request = $request;
+
+        $this->response = $response;
+    }
+
+    public function json($data, $code = 200, $options = 0)
+    {
+        $response = $this->response->withStatus($code);
+
+        $stream = json_encode($data);
+
+        $response->getBody()->write($stream);
+
+        return $response->withHeader('Content-Type', 'application/json');
+    }
+}
\ No newline at end of file