Merge branch '5.1' into 5.2

* 5.1:
  Use ::class keyword when possible

Author: fabpot

Tests/RouteCollectionTest.php

@@ -66,7 +66,7 @@ public function testIterator()
         $collection->addCollection($collection1);
         $collection->add('last', $last = new Route('/last'));
 
-        $this->assertInstanceOf('\ArrayIterator', $collection->getIterator());
+        $this->assertInstanceOf(\ArrayIterator::class, $collection->getIterator());
         $this->assertSame(['bar' => $bar, 'foo' => $foo, 'last' => $last], $collection->getIterator()->getArrayCopy());
     }
 

Tests/RouteTest.php

@@ -13,6 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\Tests\Fixtures\CustomCompiledRoute;
+use Symfony\Component\Routing\Tests\Fixtures\CustomRouteCompiler;
 
 class RouteTest extends TestCase
 {
@@ -266,13 +268,13 @@ public function testSerializeWhenCompiled()
      */
     public function testSerializeWhenCompiledWithClass()
     {
-        $route = new Route('/', [], [], ['compiler_class' => '\Symfony\Component\Routing\Tests\Fixtures\CustomRouteCompiler']);
-        $this->assertInstanceOf('\Symfony\Component\Routing\Tests\Fixtures\CustomCompiledRoute', $route->compile(), '->compile() returned a proper route');
+        $route = new Route('/', [], [], ['compiler_class' => CustomRouteCompiler::class]);
+        $this->assertInstanceOf(CustomCompiledRoute::class, $route->compile(), '->compile() returned a proper route');
 
         $serialized = serialize($route);
         try {
             $unserialized = unserialize($serialized);
-            $this->assertInstanceOf('\Symfony\Component\Routing\Tests\Fixtures\CustomCompiledRoute', $unserialized->compile(), 'the unserialized route compiled successfully');
+            $this->assertInstanceOf(CustomCompiledRoute::class, $unserialized->compile(), 'the unserialized route compiled successfully');
         } catch (\Exception $e) {
             $this->fail('unserializing a route which uses a custom compiled route class');
         }