Add RouteCollection::__isset method

Author: natanfelles

src/RouteCollection.php

@@ -108,6 +108,11 @@ public function __get(string $property) : mixed
         );
     }
 
+    public function __isset(string $property) : bool
+    {
+        return isset($this->{$property});
+    }
+
     /**
      * @param string $origin
      *

tests/RouteCollectionTest.php

@@ -344,6 +344,14 @@ public function testMethodNotFound() : void
         $this->collection->bazz(); // @phpstan-ignore-line
     }
 
+    public function testIsset() : void
+    {
+        self::assertTrue(isset($this->collection->origin));
+        self::assertTrue(isset($this->collection->router));
+        self::assertTrue(isset($this->collection->routes));
+        self::assertFalse(isset($this->collection->notFoundAction));
+    }
+
     public function testGetProperties() : void
     {
         self::assertIsString($this->collection->origin);