/**
* @return void
*/
public function testExecute()
{
$content = ['export'];
$this->abstractBlockMock->expects($this->once())->method('getExcelFile')->willReturn($content);
$this->layoutMock->expects($this->once())->method('getChildBlock')->with('adminhtml.block.report.product.lowstock.grid', 'grid.export')->willReturn($this->abstractBlockMock);
$this->fileFactoryMock->expects($this->once())->method('create')->with('products_lowstock.xml', $content, \Magento\Framework\App\Filesystem\DirectoryList::VAR_DIR);
$this->exportLowstockExcel->execute();
}
