fixed bug with root alias

flight/net/Route.php

@@ -192,7 +192,9 @@ class Route
         // catches potential optional parameter
         $url = str_replace('(/', '/', $url);
         // trim any trailing slashes
-        $url = rtrim($url, '/');
+		if($url !== '/') {
+	        $url = rtrim($url, '/');
+		}
         return $url;
     }
 

tests/RouterTest.php

@@ -533,6 +533,13 @@ class RouterTest extends TestCase
         $this->assertTrue($result);
     }
 
+	public function testGetRootUrlByAlias()
+    {
+        $this->router->map('/', [$this, 'ok'], false, 'path1');
+        $url = $this->router->getUrlByAlias('path1');
+        $this->assertEquals('/', $url);
+    }
+
     public function testGetUrlByAliasNoMatches()
     {
         $this->router->map('/path1', [$this, 'ok'], false, 'path1');