Symfony\Component\Routing\Loader\ClosureLoader::supports PHP Method

    public function supports($resource)
    {
        return $resource instanceof \Closure;
    }

 /**
  * @covers Symfony\Component\Routing\Loader\ClosureLoader::supports
  */
 public function testSupports()
 {
     $loader = new ClosureLoader();
     $this->assertTrue($loader->supports(function ($container) {
     }), '->supports() returns true if the resource is loadable');
     $this->assertFalse($loader->supports('foo.foo'), '->supports() returns true if the resource is loadable');
 }