[HttpFoundation] added some tests for the previous merge and removed …

…dead code (closes #6037)

src/Symfony/Component/HttpFoundation/Response.php

@@ -692,14 +692,8 @@ public function getMaxAge()
             return $age;
         }
 
-        $expiry = $this->getExpires();
-
-        if (!$expiry instanceof \DateTime && (-1 == $expiry || 0 === $expiry)) {
-            return $expiry;
-        }
-
-        if (null !== $expiry) {
-            return $expiry->format('U') - $this->getDate()->format('U');
+        if (null !== $this->getExpires()) {
+            return $this->getExpires()->format('U') - $this->getDate()->format('U');
         }
 
         return null;

src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php

@@ -351,6 +351,23 @@ public function testPrepareRemovesContentForHeadRequests()
         $this->assertEquals('', $response->getContent());
     }
 
+    public function testPrepareSetsPragmaOnHttp10Only()
+    {
+        $request = Request::create('/', 'GET');
+        $request->server->set('SERVER_PROTOCOL', 'HTTP/1.0');
+
+        $response = new Response('foo');
+        $response->prepare($request);
+        $this->assertEquals('no-cache', $response->headers->get('pragma'));
+        $this->assertEquals('-1', $response->headers->get('expires'));
+
+        $request->server->set('SERVER_PROTOCOL', 'HTTP/1.1');
+        $response = new Response('foo');
+        $response->prepare($request);
+        $this->assertFalse($response->headers->has('pragma'));
+        $this->assertFalse($response->headers->has('expires'));
+    }
+
     public function testSetCache()
     {
         $response = new Response();