make test work with newer symfony versions

Author: dbu

src/Event/RouterMatchEvent.php

@@ -30,7 +30,7 @@ public function __construct(Request $request = null)
     }
 
     /**
-     * @return Request | null
+     * @return Request|null
      */
     public function getRequest()
     {

tests/Unit/Routing/ChainRouterTest.php

@@ -476,14 +476,19 @@ public function testMatchRequestNotFound()
     public function testMatchWithRequestMatchersNotFound()
     {
         $url = '/test';
-        $request = Request::create('/test');
+        $expected = Request::create('/test');
+        $expected->server->remove('REQUEST_TIME_FLOAT');
 
         $high = $this->createMock(RequestMatcher::class);
 
         $high
             ->expects($this->once())
             ->method('matchRequest')
-            ->with($request)
+            ->with($this->callback(function (Request $actual) use ($expected): bool {
+                $actual->server->remove('REQUEST_TIME_FLOAT');
+
+                return $actual == $expected;
+            }))
             ->will($this->throwException(new ResourceNotFoundException()))
         ;