Piwik\DataTable\Row::setSubtable PHP Method

    public function setSubtable(DataTable $subTable)
    {
        $this->subtableId = $subTable->getId();
        $this->isSubtableLoaded = true;
        return $subTable;
    }

 /**
  * @group Core
  */
 public function testSubDataTableIsDestructed()
 {
     $mockedDataTable = $this->getMock('\\Piwik\\DataTable', array('__destruct'));
     $mockedDataTable->expects($this->once())->method('__destruct');
     $rowBeingDestructed = new Row();
     $rowBeingDestructed->setSubtable($mockedDataTable);
     Common::destroy($rowBeingDestructed);
 }