Tests cleaned up a little

Removed the empty `foreach()` loops and replaced assertEquals on the array index with an `assertCount()`

Author: carlcasbolt

tests/Elasticsearch/Tests/Helper/Iterators/SearchResponseIteratorTest.php

@@ -78,10 +78,7 @@ public function testWithNoResults()
 
         $responses = new SearchResponseIterator($mock_client, $search_params);
 
-        foreach ($responses as $i => $response) {
-        }
-
-        $this->assertEquals(0, $i);
+        $this->assertCount(0, $responses);
     }
 
     public function testWithScan()
@@ -179,9 +176,6 @@ public function testWithScan()
 
         $responses = new SearchResponseIterator($mock_client, $search_params);
 
-        foreach ($responses as $i => $response) {
-        }
-
-        $this->assertEquals(2, $i);
+        $this->assertCount(2, $responses);
     }
 }