Synchronization in Selenium Webdriver

Synchronization in Selenium Webdriver

It is a mechanism which involves more than one component to work parallel with Each other in Test Automation, we have two components

1.  Application under Test.

2. Test Automation Tool.  

These components have their own speed. We should write our scripts in such a way. That both the components should move with same and desired speed. So that we will not encounter Element Not Found errors. This will consume time again in debugging in Selenium. Synchronization classifies into two categories

  1. Unconditional.
  2. Conditional Synchronization.


In this specify timeout value only. We will make the tool to wait until a certain amount of time and then proceed further. The main disadvantage chance of unnecessary waiting time the application is ready. Where we interact for third-party systems like interfaces. It is not possible to write a condition or check for a condition. We have to make the application to wait for a certain amount of time by specifying the timeout value.

Conditional Synchronization:

We specify a condition along with timeout value. So that tool waits to check for the condition to nothing happens. It is very important to set the timeout value in conditional synchronization. The tool should proceed further instead of making for a particular condition to meet. In Selenium we have implicit Wait and Explicit Wait conditional statements.

1. Implicit Wait.

An implicit wait is to tell Selenium WebDriver to poll the DOM for a certain amount of time. When trying to find an element or elements are not available. The default setting is 0. Once when we define the implicit wait, it will set for the life of the WebDriver object instance. It is a mechanism written once and applied for the entire session. It applied immediately once we start the Webdriver. The implicit wait will not work all the commands/statements in the application. It will work only for FindElement and FindElements statements in Selenium Training in Hyderabad. we set implicit wait, find element will not throw an exception if the element is not found in the first instance. It will poll for the element until the timeout proceeds further. We should always remember to add the Webdriver statement.



2. Explicit Wait:

We wait statement for certain condition satisfied until the specified timeout period. If the Webdriver finds the element within the timeout period the code will get executed. The Explicit wait for a specific content attribute change after performing any action. When application gives AJAX call to the system and gets dynamic data on UI.

3. Fluent Wait:

Using FluentWait define the largest amount of time to wait for a condition. The frequency to check for the condition. The user can configure to ignore specific types of exceptions. Such as NoSuchElement Exception when searching for an element. NoSuchElement exception thrown by findElement and findElements. Whenever it tries to find any element it returns the first matching element on the current page. It throws NoSuchElementException when no matching elements founded.