/**
  * Get pattern instance
  *
  * @return \Magento\ToolkitFramework\ImportExport\Fixture\Complex\Pattern
  */
 protected function getPattern()
 {
     if (!$this->_pattern instanceof \Magento\ToolkitFramework\ImportExport\Fixture\Complex\Pattern) {
         $patternData = [['id' => '%s', 'name' => 'Static', 'calculated' => function ($index) {
             return $index * 10;
         }], ['name' => 'xxx %s'], ['name' => 'yyy %s']];
         $this->_pattern = new \Magento\ToolkitFramework\ImportExport\Fixture\Complex\Pattern();
         $this->_pattern->setHeaders(array_keys($patternData[0]));
         $this->_pattern->setRowsSet($patternData);
     }
     return $this->_pattern;
 }