List<WebElement> rows = driver.findElements(By
.className("v-table-cell-wrapper"));
WebElement rangeStart = rows.get(0);
WebElement rangeEnd = rows.get(1);
rangeStart.click();
new Actions(driver).keyDown(Keys.SHIFT).perform();
rangeEnd.click();
new Actions(driver).keyUp(Keys.SHIFT).perform();
driver.findElement(By.className("v-button")).click();
WebElement extraRow = driver.findElements(
By.className("v-table-cell-wrapper")).get(1);
new Actions(driver).keyDown(Keys.CONTROL).click(extraRow)
.click(extraRow).keyUp(Keys.CONTROL).perform();
driver.findElement(By.className("v-button")).click();
try {
driver.findElement(By.vaadin("Root/VNotification[0]"));
Assert.fail("Notification is shown");