make getCount compatible with new Traversable return type of getIterator

src/Pagination/DoctrinePaginatorAdapter.php

@@ -73,7 +73,7 @@ public function getTotal(): int
      */
     public function getCount(): int
     {
-        return $this->paginator->count();
+        return iterator_count($this->paginator->getIterator());
     }
 
     /**

test/Pagination/DoctrinePaginatorAdapterTest.php

@@ -1,6 +1,7 @@
 <?php
 namespace League\Fractal\Test\Pagination;
 
+use ArrayIterator;
 use Doctrine\ORM\Query;
 use League\Fractal\Pagination\DoctrinePaginatorAdapter;
 use Mockery;
@@ -28,11 +29,9 @@ public function testPaginationAdapter()
         $paginator->shouldReceive('getQuery')->andReturn($query);
 
         //Mock the iterator of the paginator
-        $iterator = Mockery::mock('IteratorAggregate');
-        $iterator->shouldReceive('count')->andReturn($count);
+        $iterator = new ArrayIterator(range(1, $count));
         $paginator->shouldReceive('getIterator')->andReturn($iterator);
 
-
         $adapter = new DoctrinePaginatorAdapter($paginator, function ($page) {
             return 'http://example.com/foo?page='.$page;
         });