diff --git a/library/Barberry/Application.php b/library/Barberry/Application.php
index 59c6faa..54e8ecf 100644
--- a/library/Barberry/Application.php
+++ b/library/Barberry/Application.php
@@ -9,9 +9,19 @@ class Application
      */
     private $resources;
 
-    public function __construct(Config $config, Filter\FilterInterface $filter = null)
+    /**
+     * @var RequestSource
+     */
+    private $requestSource;
+
+    public function __construct(Config $config, Filter\FilterInterface $filter = null, RequestSource $requestSource = null)
     {
-        $this->resources = new Resources($config, $filter);
+        if (is_null($requestSource)) {
+            $requestSource = new RequestSource();
+        }
+        $this->requestSource = $requestSource;
+
+        $this->resources = new Resources($config, $requestSource, $filter);
     }
 
     /**
@@ -22,7 +32,7 @@ public function run()
         $controller = new Controller($this->resources->request(), $this->resources->storage(), new Direction\Factory());
 
         try {
-            $response = $controller->{$_SERVER['REQUEST_METHOD']}();
+            $response = $controller->{$this->requestSource->_SERVER['REQUEST_METHOD']}();
             $this->invokeCache($response);
 
             return $response;
@@ -41,9 +51,9 @@ public function run()
 
     private function invokeCache(Response $response)
     {
-        if('GET' == strtoupper($_SERVER['REQUEST_METHOD'])) {
+        if('GET' == strtoupper($this->requestSource->_SERVER['REQUEST_METHOD'])) {
             $this->resources->cache()->save($response->body, $this->resources->request());
-        } elseif('DELETE' == strtoupper($_SERVER['REQUEST_METHOD'])) {
+        } elseif('DELETE' == strtoupper($this->requestSource->_SERVER['REQUEST_METHOD'])) {
             $this->resources->cache()->invalidate($this->resources->request());
         }
     }
diff --git a/library/Barberry/PostedFile/Collection.php b/library/Barberry/PostedFile/Collection.php
index 9d479a0..5a465ef 100644
--- a/library/Barberry/PostedFile/Collection.php
+++ b/library/Barberry/PostedFile/Collection.php
@@ -133,8 +133,8 @@ public function unshift($offset, \Barberry\PostedFile $value) {
         }
     }
 
-    protected function readTempFile($filepath) {
-        if (is_uploaded_file($filepath)) {
+    protected function readTempFile($filepath, $trusted) {
+        if (is_uploaded_file($filepath) || $trusted === true) {
             return file_get_contents($filepath);
         }
         return null;
@@ -147,8 +147,9 @@ private function getPostedFile($key) {
 
         $spec = $this->specsIterator[$key];
         if (is_array($spec)) {
+            $trusted = (array_key_exists('trusted', $spec) && $spec['trusted'] === true)?:false;
             $this->specsIterator[$key] = new \Barberry\PostedFile(
-                $this->readTempFile($spec['tmp_name']),
+                $this->readTempFile($spec['tmp_name'], $trusted),
                 $spec['name']
             );
         }
diff --git a/library/Barberry/RequestSource.php b/library/Barberry/RequestSource.php
new file mode 100644
index 0000000..3fa6560
--- /dev/null
+++ b/library/Barberry/RequestSource.php
@@ -0,0 +1,55 @@
+<?php
+namespace Barberry;
+
+class RequestSource
+{
+    /**
+     * @var array
+     */
+    private $_SERVER;
+
+    /**
+     * @var array
+     */
+
+    private $_POST;
+
+    /**
+     * @var array
+     */
+    private $_FILES;
+
+    public function __construct(array $propertiesToOverride = array())
+    {
+        $this->setDefaultValues();
+
+        foreach ($propertiesToOverride as $key => $value) {
+            if (property_exists($this, $key) && (gettype($value) === gettype($this->$key))) {
+                $this->$key = $value;
+            }
+        }
+
+    }
+
+    public function __get($property) {
+        if (property_exists($this, $property)) {
+            return $this->{$property};
+        }
+        trigger_error('Undefined property via __get(): ' . $property, E_USER_NOTICE);
+        return null;
+    }
+
+    private function setDefaultValues()
+    {
+        $this->_SERVER = array_merge(
+            array(
+                'REQUEST_METHOD' => 'GET',
+                'REQUEST_URI' => '/',
+            ),
+            $_SERVER
+        );
+        $this->_FILES = $_FILES;
+        $this->_POST = $_POST;
+    }
+
+}
diff --git a/library/Barberry/Resources.php b/library/Barberry/Resources.php
index 0b3b5b6..52b5919 100644
--- a/library/Barberry/Resources.php
+++ b/library/Barberry/Resources.php
@@ -19,14 +19,21 @@ class Resources
      */
     private $filter;
 
+    /**
+     * @var RequestSource
+     */
+    private $requestSource;
+
+
     /**
      * @param Config $config
      * @param Filter\FilterInterface $filter
      */
-    public function __construct(Config $config, Filter\FilterInterface $filter = null)
+    public function __construct(Config $config, RequestSource $requestSource, Filter\FilterInterface $filter = null)
     {
         $this->config = $config;
         $this->filter = $filter;
+        $this->requestSource = $requestSource;
     }
 
     /**
@@ -68,8 +75,10 @@ public function request()
             function () use ($filter) {
                 $dp = new PostedDataProcessor($filter);
                 return new Request(
-                    array_key_exists('REQUEST_URI', $_SERVER) ? $_SERVER['REQUEST_URI'] : '/',
-                    $dp->process($_FILES, $_POST)
+                    array_key_exists('REQUEST_URI', $this->requestSource->_SERVER)
+                        ? $this->requestSource->_SERVER['REQUEST_URI']
+                        : '/',
+                    $dp->process($this->requestSource->_FILES, $this->requestSource->_POST)
                 );
             }
         );
diff --git a/library/Barberry/Test/Data.php b/library/Barberry/Test/Data.php
index 752ca26..cd4f778 100644
--- a/library/Barberry/Test/Data.php
+++ b/library/Barberry/Test/Data.php
@@ -34,4 +34,12 @@ public static function odsSpreadsheet() {
     public static function pdfDocument() {
         return file_get_contents(__DIR__ . '/data/sample.pdf');
     }
+
+    public static function gif1x1Path() {
+        return __DIR__ . '/data/1x1.gif';
+    }
+
+    public static function pdfDocumentPath() {
+        return __DIR__ . '/data/sample.pdf';
+    }
 }
diff --git a/test/integration/ApplicationTest.php b/test/integration/ApplicationTest.php
index 715dcac..81102c1 100644
--- a/test/integration/ApplicationTest.php
+++ b/test/integration/ApplicationTest.php
@@ -6,8 +6,6 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
 
     public function testCanRun()
     {
-        $_SERVER['REQUEST_METHOD'] = 'GET';
-
         $a = new Application(new Config(__DIR__));
         $this->assertInstanceOf('Barberry\\Response', $a->run());
     }
diff --git a/test/phpunit.xml b/test/phpunit.xml
index ae202d5..7edd892 100644
--- a/test/phpunit.xml
+++ b/test/phpunit.xml
@@ -8,7 +8,6 @@
          convertWarningsToExceptions="true"
          forceCoversAnnotation="false"
          mapTestClassNameToCoveredClassName="false"
-         printerClass="PHPUnit_TextUI_ResultPrinter"
          processIsolation="false"
          stopOnError="true"
          stopOnFailure="true"
diff --git a/test/unit/ConfigTest.php b/test/unit/ConfigTest.php
index 72aaef1..63102aa 100644
--- a/test/unit/ConfigTest.php
+++ b/test/unit/ConfigTest.php
@@ -3,7 +3,7 @@
 
 class ConfigTest extends \PHPUnit_Framework_TestCase {
 
-    public function testOptionsCanBeOverriden() {
+    public function testOptionsCanBeOverridden() {
         $config = new Config(__DIR__, '/test_config.php');
         $this->assertEquals('/usr/another/storage', $config->directoryStorage);
     }
diff --git a/test/unit/PostedFile/CollectionTest.php b/test/unit/PostedFile/CollectionTest.php
index f2690a6..6b819b0 100644
--- a/test/unit/PostedFile/CollectionTest.php
+++ b/test/unit/PostedFile/CollectionTest.php
@@ -107,6 +107,11 @@ public function testCanBeCreatedWithPostedFilesInConstructor() {
         $this->assertEquals(Test\Data::gif1x1(), $collection['file']->bin);
     }
 
+    public function testCanReadTrustedTempFile() {
+        $collection = new Collection(array('file' => $this->goodTrustedFileInPhpFilesArray()));
+        $this->assertEquals(Test\Data::gif1x1(), $collection['file']->bin);
+    }
+
 //--------------------------------------------------------------------------------------------------
 
     private static function goodFileInPhpFilesArray() {
@@ -134,6 +139,16 @@ private static function badFileInPhpFilesArray() {
         );
     }
 
+    private static function goodTrustedFileInPhpFilesArray() {
+        return array(
+            'size' => 43,
+            'tmp_name' => Test\Data::gif1x1Path(),
+            'error' => UPLOAD_ERR_OK,
+            'name' => 'Name of a file.txt',
+            'trusted' => true,
+        );
+    }
+
     private function partiallyMockedEmptyCollection(array $specs = null) {
         if ($specs === null) {
             $specs = array('file' => self::goodFileInPhpFilesArray());
diff --git a/test/unit/RequestSourceTest.php b/test/unit/RequestSourceTest.php
new file mode 100644
index 0000000..e0566eb
--- /dev/null
+++ b/test/unit/RequestSourceTest.php
@@ -0,0 +1,73 @@
+<?php
+namespace Barberry;
+
+class RequestSourceTest extends \PHPUnit_Framework_TestCase {
+
+    public function testHaveServerProperty() {
+        $requestSource = new RequestSource();
+        $this->assertEquals(true, property_exists($requestSource, '_SERVER'));
+    }
+
+    public function testServerPropertyHasArrayType() {
+        $requestSource = new RequestSource();
+        $this->assertInternalType('array', $requestSource->_SERVER);
+    }
+
+    public function testHavePostProperty() {
+        $requestSource = new RequestSource();
+        $this->assertEquals(true, property_exists($requestSource, '_POST'));
+    }
+
+    public function testPostPropertyHasArrayType() {
+        $requestSource = new RequestSource();
+        $this->assertInternalType('array', $requestSource->_POST);
+    }
+
+    public function testHaveFilesProperty() {
+        $requestSource = new RequestSource();
+        $this->assertEquals(true, property_exists($requestSource, '_FILES'));
+    }
+
+    public function testFilesPropertyHasArrayType() {
+        $requestSource = new RequestSource();
+        $this->assertInternalType('array', $requestSource->_FILES);
+    }
+
+    public function testPropertiesOverriddenOnlyIfHaveSameAsDefaultType() {
+        $requestSource = new RequestSource(array(
+            '_SERVER' => null,
+        ));
+        $this->assertInternalType(gettype($_SERVER), $requestSource->_SERVER);
+    }
+
+    public function testHaveProperServerKeys() {
+        $requestSource = new RequestSource();
+        $haveAllKeys = array_reduce(
+            $this->serverKeys(),
+            function($result, $propertyKey) use ($requestSource) {
+                $result = $result && array_key_exists($propertyKey, $requestSource->_SERVER);
+                return $result;
+            },
+            true
+        );
+
+        $this->assertEquals(true, $haveAllKeys);
+    }
+
+    public function testPropertiesCanBeOverridden() {
+        $requestSource = new RequestSource(array(
+            '_SERVER' => array(
+                'REQUEST_URI' => '/some/url'
+            ),
+        ));
+        $this->assertEquals('/some/url', $requestSource->_SERVER['REQUEST_URI']);
+    }
+
+    protected function serverKeys() {
+        return array(
+            'REQUEST_METHOD',
+            'REQUEST_URI',
+        );
+    }
+
+}
diff --git a/test/unit/ResourceTest.php b/test/unit/ResourceTest.php
index 89d47ac..30bcb0f 100644
--- a/test/unit/ResourceTest.php
+++ b/test/unit/ResourceTest.php
@@ -31,6 +31,6 @@ public function testPassesDataFilterToPostedDataProcessor() {
 //--------------------------------------------------------------------------------------------------
 
     private static function r(Filter\FilterInterface $filter = null) {
-        return new Resources(new Config(__DIR__), $filter);
+        return new Resources(new Config(__DIR__), new RequestSource(), $filter);
     }
 }