使用 Selenium WebDriver 和 java 断言 WebElement 不存在

Question

In tests that I write, if I want to assert a WebElement is present on the page, I can do a simple:

driver.findElement(By.linkText("Test Search"));

This will pass if it exists and it will bomb out if it does not exist. But now I want to assert that a link does not exist. I am unclear how to do this since the code above does not return a boolean.

EDIT This is how I came up with my own fix, I'm wondering if there's a better way out there still.

public static void assertLinkNotPresent (WebDriver driver, String text) throws Exception {
List<WebElement> bob = driver.findElements(By.linkText(text));
  if (bob.isEmpty() == false) {
    throw new Exception (text + " (Link is present)");
  }
}

Answer 1

这样做更容易：

driver.findElements(By.linkText("myLinkText")).size() < 1

Answer 2

I think that you can just catch org.openqa.selenium.NoSuchElementException that will be thrown by driver.findElement if there's no such element:

import org.openqa.selenium.NoSuchElementException;

....

public static void assertLinkNotPresent(WebDriver driver, String text) {
    try {
        driver.findElement(By.linkText(text));
        fail("Link with text <" + text + "> is present");
    } catch (NoSuchElementException ex) { 
        /* do nothing, link is not present, assert is passed */ 
    }
}

Answer 3

Not Sure which version of selenium you are referring to, however some commands in selenium * can now do this: http://release.seleniumhq.org/selenium-core/0.8.0/reference.html

• assertNotSomethingSelected
• assertTextNotPresent

Etc..

Answer 4

There is an Class called ExpectedConditions :

  By loc = ...
  Boolean notPresent = ExpectedConditions.not(ExpectedConditions.presenceOfElementLocated(loc)).apply(getDriver());
  Assert.assertTrue(notPresent);

Answer 5

Try this -

private boolean verifyElementAbsent(String locator) throws Exception {
    try {
        driver.findElement(By.xpath(locator));
        System.out.println("Element Present");
        return false;

    } catch (NoSuchElementException e) {
        System.out.println("Element absent");
        return true;
    }
}

Answer 6

使用 Selenium Webdriver 将是这样的：

assertTrue(!isElementPresent(By.linkText("Empresas en Misión")));

Answer 7

It looks like findElements() only returns quickly if it finds at least one element. Otherwise it waits for the implicit wait timeout, before returning zero elements - just like findElement() .

To keep the speed of the test good, this example temporarily shortens the implicit wait, while waiting for the element to disappear:

static final int TIMEOUT = 10;

public void checkGone(String id) {
    FluentWait<WebDriver> wait = new WebDriverWait(driver, TIMEOUT)
            .ignoring(StaleElementReferenceException.class);

    driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
    try {
        wait.until(ExpectedConditions.numberOfElementsToBe(By.id(id), 0));
    } finally {
        resetTimeout();
    }
}

void resetTimeout() {
    driver.manage().timeouts().implicitlyWait(TIMEOUT, TimeUnit.SECONDS);
}

Still looking for a way to avoid the timeout completely though...

Answer 8

boolean titleTextfield = driver.findElement(By.id("widget_polarisCommunityInput_113_title")).isDisplayed();
assertFalse(titleTextfield, "Title text field present which is not expected");

Answer 9

You can utlilize Arquillian Graphene framework for this. So example for your case could be

Graphene.element(By.linkText(text)).isPresent().apply(driver));

Is also provides you bunch of nice API's for working with Ajax, fluent waits, page objects, fragments and so on. It definitely eases a Selenium based test development a lot.

Answer 10

For node.js I've found the following to be effective way to wait for an element to no longer be present:

// variable to hold loop limit
    var limit = 5;
// variable to hold the loop count
    var tries = 0;
        var retry = driver.findElements(By.xpath(selector));
            while(retry.size > 0 && tries < limit){
                driver.sleep(timeout / 10)
                tries++;
                retry = driver.findElements(By.xpath(selector))
            }

Answer 11

Not an answer to the very question but perhaps an idea for the underlying task:

When your site logic should not show a certain element, you could insert an invisible "flag" element that you check for.

if condition
    renderElement()
else
    renderElementNotShownFlag() // used by Selenium test

Answer 12

Please find below example using Selenium "until.stalenessOf" and Jasmine assertion. It returns true when element is no longer attached to the DOM.

const { Builder, By, Key, until } = require('selenium-webdriver');

it('should not find element', async () => {
   const waitTime = 10000;
   const el = await driver.wait( until.elementLocated(By.css('#my-id')), waitTime);
   const isRemoved = await driver.wait(until.stalenessOf(el), waitTime);

   expect(isRemoved).toBe(true);
});

For ref.: Selenium:Until Doc

Answer 13

The way that I have found best - and also to show in Allure report as fail - is to try-catch the findelement and in the catch block, set the assertTrue to false, like this:

    try {
        element = driver.findElement(By.linkText("Test Search"));
    }catch(Exception e) {
        assertTrue(false, "Test Search link was not displayed");
    }

Answer 14

This is the best approach for me

public boolean isElementVisible(WebElement element) {
    try { return element.isDisplayed(); } catch (Exception ignored) { return false; }
}

Answer 15

For a JavaScript (with TypeScript support) implementation I came up with something, not very pretty, that works:

  async elementNotExistsByCss(cssSelector: string, timeout=100) {
    try {
      // Assume that at this time the element should be on page
      await this.getFieldByCss(cssSelector, timeout);
      // Throw custom error if element s found
      throw new Error("Element found");
    } catch (e) {
      // If element is not found then we silently catch the error
      if (!(e instanceof TimeoutError)) {
        throw e;
      }
      // If other errors appear from Selenium it will be thrown
    }
  }

PS: I am using "selenium-webdriver": "^4.1.1"

Answer 16

findElement will check the html source and will return true even if the element is not displayed. To check whether an element is displayed or not use -

private boolean verifyElementAbsent(String locator) throws Exception {

        boolean visible = driver.findElement(By.xpath(locator)).isDisplayed();
        boolean result = !visible;
        System.out.println(result);
        return result;
}

Answer 17

For appium 1.6.0 and above

    WebElement button = (new WebDriverWait(driver, 10).until(ExpectedConditions.presenceOfElementLocated(By.xpath("//XCUIElementTypeButton[@name='your button']"))));
    button.click();

    Assert.assertTrue(!button.isDisplayed());