assertEquals(
"original value not found, wrong cell or contents (1st column of the 2nd row expected)",
"Teppo", cell_1_0.getText());
// double-click to edit cell contents
cell_1_0.click();
new Actions(getDriver()).doubleClick(cell_1_0).build().perform();
sleep(100);
// fetch the updated cell
WebElement textField = table.getCell(1, 0).findElement(