ADDED $sortByPosition flag to Magento\Catalog\Model\Category

ADDED test testGetChildrenSroted() to integration testsuite Magento\Catalog\Model\Category

Author: Denis Ristic

app/code/Magento/Catalog/Model/Category.php

@@ -780,11 +780,12 @@ public function getAllChildren($asArray = false)
     /**
      * Retrieve children ids comma separated
      *
+     * @param boolean $sortByPosition
      * @return string
      */
-    public function getChildren()
+    public function getChildren($sortByPosition = false)
     {
-        return implode(',', $this->getResource()->getChildren($this, false));
+        return implode(',', $this->getResource()->getChildren($this, false, true, $sortByPosition));
     }
 
     /**

dev/tests/integration/testsuite/Magento/Catalog/Model/CategoryTreeTest.php

@@ -128,6 +128,12 @@ public function testGetChildren()
         $this->assertEquals(array_diff([4, 13], explode(',', $this->_model->getChildren())), []);
     }
 
+    public function testGetChildrenSorted()
+    {
+        $this->_model->load(2);
+        $this->assertEquals(array_diff([3, 4, 5], explode(',', $this->_model->getChildren(true))), []);
+    }
+
     public function testGetPathInStore()
     {
         $this->_model->load(5);