How To Handle Cookies in Selenium WebDriver

Websites may use cookies for different purposes, including saving data during a visitor session.

A potential problem might happen while running automated tests. The website under test might be saving specific data in the same cookie for multiple tests.

For example, let's say you are testing a shopping cart by adding an item. If one test adds the item to the cart, data might be saved in a cookie.

The second test might have logic which assumes that the cart is empty.
The cookie from the first test is still stored however, resulting in a test failure for the second test.

It's important to make sure that your tests always start from a pristine state, without any previous test data.

At TestingBot, we make sure every test start from a pristine, single-use virtual machine.

Anatomy of a cookie

A cookie may contain the following data:

• Name: This flag contains the name of the cookie.
• Value: This flag contains the value of the cookie.
• Domain: This determines on which domain the cookie resides.
• Path: This flag contains the URL required in the requested URL.
• Expires / Max-Age: The expiration date or the maximum age of the cookie.
• HttpOnly: Should this cookie be used only over HTTP?
• Secure: This determines if the cookie can only be sent over HTTPS.
• SameSite: This flag contains the values (strict or lax) if the cookie is using the experimental SameSite attribute.

Strict Cookie

When the sameSite attribute is set to Strict, cookies will not be sent to third-party websites.

Lax Cookie

When the sameSite attribute is set to Lax, cookies will be sent with GET requests to third-party websites.

Selenium WebDriver offers various methods to interact with cookies:

• Get cookie:

  Gets all cookies or a specific cookie, by name, for the current domain. You can use this to get the value, or check if the cookie exists.

  

  # Returns the cookie according to a name
  
  cookie = driver.manage.cookie_named(cookie_name)
  # Returns a list of all Cookies
  
  cookies = driver.manage.all_cookies

  

  # Returns the cookie according to a name
  cookie = driver.get_cookie(cookie_name)
  # Returns a list of all Cookies
  cookies = driver.get_cookies()

  

  $driver->manage()->getCookie($cookieName);

  

  // Returns the cookie according to a name
  
  driver.manage().getCookieNamed(cookieName);
  // Returns a list of all Cookies
  
  driver.manage().getCookies();

  

  // Returns the cookie according to a name
  
  driver.manage().getCookie(cookieName).then(function (cookie) {
  	console.log(cookie);
  });
  // Returns a list of all Cookies
  
  driver.manage().getCookies().then(function (cookies) {
   	console.log(cookies);
  });

  

  // Returns the cookie according to a name
  
  var cookie = driver.Manage().Cookies.GetCookieNamed(cookieName);
  // Returns a list of all Cookies
  
  var cookies = driver.Manage().Cookies.AllCookies;

• Add cookie:

  Adds a cookie for the current domain:

  

  require 'selenium-webdriver'
  driver = Selenium::WebDriver.for :chrome
  
  begin
    driver.get 'https://testingbot.com'
    # Add a cookie, named "newCookieKey" with value "newCookieValue"
  
    driver.manage.add_cookie(name: "newCookieKey", value: "newCookieValue")
  ensure
    driver.quit
  end

  

  from selenium import webdriver
  driver = webdriver.Chrome()
  
  driver.get("https://testingbot.com")
  
  # Add a cookie, named "newCookieKey" with value "newCookieValue"
  driver.add_cookie({"name": "newCookieKey", "value": "newCookieValue"})
  driver.quit

  

  $driver->manage()->addCookie(['name' => 'newCookieKey, 'value' => 'newCookieValue']);

  

  import org.openqa.selenium.Cookie;
  Cookie cname = new Cookie("newCookieKey", "newCookieValue");
  driver.manage().addCookie();

  

  const {Builder} = require('selenium-webdriver');
  (async function example() {
      let driver = new Builder()
          .forBrowser('chrome')
          .build();
  
      await driver.get('https://testingbot.com');
  
      // Add a cookie, named "newCookieKey" with value "newCookieValue"
  
      await driver.manage().addCookie({name:'newCookieKey', value: 'newCookieValue'});
      await driver.quit()
  })();

  

  using OpenQA.Selenium;
  using OpenQA.Selenium.Chrome;
  
  namespace AddCookie {
   class AddCookie {
    public static void Main(string[] args) {
     IWebDriver driver = new ChromeDriver();
     try {
      // Navigate to Url
  
      driver.Navigate().GoToUrl("https://testingbot.com");
  
      // Add a cookie, named "newCookieKey" with value "newCookieValue"
  
      driver.Manage().Cookies.AddCookie(new Cookie("newCookieKey", "newCookieValue"));
     } finally {
      driver.Quit();
     }
    }
   }
  }

• Delete cookie:

  Deletes a specific cookie, or all cookies for the current domain.

  

  # Delete a specific cookie by name
  
  driver.manage.delete_cookie(cookie_name)
  # Delete all cookies
  
  driver.manage.delete_all_cookies
  

  

  # Delete a specific cookie by name
  driver.delete_cookie(cookie_name)
  # Delete all cookies
  driver.delete_all_cookies()

  

  $driver->manage()->deleteCookie($cookieName);

  

  // Delete a specific cookie by name
  
  driver.manage().deleteCookie(cookieName);
  // Delete all cookies
  
  driver.manage().deleteAllCookies();

  

  // Delete a specific cookie by name
  
  await driver.manage().deleteCookie(cookieName);
  // Delete all cookies
  
  await driver.manage().deleteAllCookies();

  

  // Delete a specific cookie by name
  
  driver.Manage().Cookies.DeleteCookie(cookieName);
  // Delete all cookies
  
  driver.Manage().Cookies.DeleteAllCookies();

Iterate over all cookies

Let's see another example where we iterate over all available cookies and print the contents of each cookie, for debugging purposes:

You can modify the loop to delete specific cookies, or write the contents to a file as a test artifact.

Replacing cookies

To replace a cookie during an automated test, we suggest deleting the specific cookie and setting a new cookie with the same name.

Expiring cookies

Cookies have a expiry flag which browsers use to automatically expire specific cookies.
To set a cookie with an expiration date via Selenium, please use the expiry argument in the Cookie constructor:

To use the Selenium Cookie API with a Selenium Grid, you can use RemoteWebdriver and call the Selenium Cookie methods on the RemoteWebDriver object.

Instead of running your Selenium tests on your local computer, you might want to run tests on a (Cloud) Selenium grid. This offers great advantages, such as:

• Increased scalability: run tests in parallel on a Cloud grid such as TestingBot.
• Increased reliability: tests can be retried automatically when a connection/OS issue is detected.
• Performance: you can run the browser tests on more powerful computers than your own computer.

Please see the example below on how to clear cookies during a TestingBot test:

In between automated tests, you might want to clear the cache of your browser, which includes history state, cookies and other saved data.

It's important for tests to be able to start with a pristine state.
If there are leftover artifacts from previous test sessions, for example an item still in a shopping cart, the test's assertion might fail.

We'll show you two solutions to clear the browser's cache automatically:

DeleteAllCookies with Selenium WebDriver

Selenium WebDriver offers a Selenium Cookie API which allows you to delete all cookies, the method is called webDriver.Manage().Cookies.DeleteAllCookies:

Clear Browser Data with Chromedriver

You can use Chromedriver to clear the browser cache. Of course, this only works when testing on Chrome.
If you are testing on a different browser, we recommend using the Selenium Cookie API.