public function testResolversAreCalledOnSelectMany()
 {
     $enumerable = new Collection([[1, 2], [3, 4]]);
     $resolver = $this->getMockForAbstractClass('\\BCC\\EnumerableUtility\\Resolver\\ResolverInterface', ['resolve']);
     $resolver->expects($this->once())->method('resolve')->with('test')->will($this->returnValue(function ($item) {
         return $item;
     }));
     Collection::prependResolver($resolver);
     $enumerable->selectMany('test');
     Collection::resetResolvers();
 }