TOP 20 SELENIUM QUESTIONS FOR ACING INTERVIEW

Selenium is a free open-source automated testing framework for validating web applications across a variety of browsers and platforms. Selenium Test Scripts can be written in a number of languages, including Java, C#, Python, and others. Testing carried out with the Selenium testing tool is referred to as Selenium Testing.


Here are the top 20 questions which will help you in preparing for your interview.

 1. What are the benefits of using Selenium as a tool for automation?

 

 

The benefits of using Selenium for automated testing are as follows:

 

Open-Source: As previously stated, Selenium’s greatest strength is that it is a freeware and portable tool. There will be no out-of-pocket costs. The programme is available for free download, and there is also community-based support.

 

Language assistance: Selenium supports a variety of languages, including Java, Perl, Python, C#, Ruby, Groovy, JavaScript, and others. Although it has its own script, it is not bound by it. It can be used with a variety of languages, depending on the preferences of the developers and testers.

 

Compatible with a variety of operating systems: Selenium is compatible with a wide range of operating systems, including Windows, Mac OS X, Linux, and UNIX. Using the Selenium suite of products, a customised testing suite can be built on any platform and then executed on another. For example, test cases written in Windows can easily be run on a Linux system.

 

Browser compatibility: Selenium is compatible with a number of different web browsers, including Internet Explorer, Chrome, Firefox, Opera, and Safari. This is especially useful when running tests and testing them across multiple browsers at the same time.

 

Support for a wide range of programming languages and frameworks: Selenium works with a wide range of programming languages and frameworks. It can, for example, integrate with the ANT or Maven frameworks for source code compilation. The TestNG framework can also be used to test apps and generate reports. Continuous Integration (CI) can work with Jenkins or Hudson, as well as other open-source tools to provide additional functionality.

 

Testing on various devices: Selenium Test Automation can be used to automate mobile web application testing on Android, iPhone, and Blackberry. This can help with the generation of required results as well as the ongoing resolution of application bugs.

 

Regular updates:  Selenium support is built on a community model, which allows for frequent updates and upgrades. These upgrades are simple to install and do not necessitate any additional training. Selenium is thus both cost-effective and resourceful.

 

Content-rich Selenium suites include: Selenium is more than a single tool or utility; it’s a complete suite of testing tools, which is why it’s called a Suite. Each tool is tailored to specific testing requirements and testing conditions. Selenium also has tools like Selenium IDE, Selenium Grid, and Selenium Remote Control (RC).



Implementation ease: Selenium has a user-friendly interface that makes developing and running tests a breeze. Its open-source features enable users to script their own extensions, making them simple to create, modify, and manipulate at a high level. One of the reasons for Selenium’s popularity is its reporting capabilities, which allow testers to extract results and take action based on them.

 

 

2. What exactly is Selenese? Describe the various Selenium commands.

 

Selenese is the language that Selenium IDE uses to write test scripts. It’s a set of commands for testing your website or system. There are three major categories of Selenium commands:

 

Actions are commands that interact with web applications directly.

Accessors are commands that enable users to save values to a user-defined variable.

Assertions allow you to compare the current state of your application to the expected state.

 

 

 

3. In Selenium, what is the difference between the commands “type” and “typeAndWait”?

 

The “type” command is used to type keyboard key values into the text box of a software web application. The “typeAndWait” command is used when you finish typing and the software web page begins to reload, whereas the “typeAndWait” command is used when you finish typing and the software web page begins to reload. Before proceeding, this command will wait for the software program’s page to reload. If there is no page reload event when typing, you must use a basic “type” command.

 

 

 

 4. Is Selenium capable of handling a windows-based pop-up, and if not, what are the alternatives?

Since Selenium is an automated testing tool designed for web application testing, it does not support windows-based pop-ups. Windows-based pop-ups, on the other hand, can be handled in Selenium with the help of third-party tools such as AutoIT, Robot class, and others.

 

 

 

5. Is Selenium capable of capturing a screenshot? If so, create a simple programme to demonstrate the concept.

 

Yes, we can capture the screenshot in Selenium using a web driver. The code to accomplish this can be found below.

 

 

Selenium is a free open-source automated testing framework for validating web applications across a variety of browsers and platforms. Selenium Test Scripts can be written in a number of languages, including Java, C#, Python, and others. Testing carried out with the Selenium testing tool is referred to as Selenium Testing.

				
					import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class TakeScreenshot {
WebDriver drv;
   @ Before
   public void setUp() throws Exception {
   driver = new FirefoxDriver();
   drv.get("https://google.com");
}
   @ After
   public void tearDown() throws Exception {
   drv.quit();
   }
   @ Test
   public void test() throws IOException {
   // Capture the screenshot
   File scrFile = ((TakeScreenshot)drv).getScreenshotAs(OutputType.FILE);
   // Code for pasting screenshot to a user-specified location
   FileUtils.copyFile(scrFile, new File("C:\\Screenshot\\Scr.jpg"))
   }
}
 
 
 

				
			

 

 

 6. Explain how Selenium handles the same-origin policy.

 

Same Origin policy is a security feature that allows a web browser to run scripts from one webpage to access the contents of another webpage if the origins of both pages are the same. The origin is the URL scheme, hostname, and port number combination. This policy was implemented to prevent unauthorised access to sensitive data on one webpage by another. Consider a Java programme used by scaler.com; it can access domain pages such as scaler.com/mentors and scaler.com/courses, but not pages from other domains such as facebook.com.




7. Explain the Selenium IDE pause feature.

By clicking on the pause icon in the top right corner of the IDE, the user can pause at the statement causing the exception and enter debug mode. This feature prevents the entire test case from failing and allows the user to immediately correct the error.

 

 


8. Explain the various types of frameworks and the relationship between Selenium and Robot Framework.

 

The following are the various framework types:

 

  • Behavior-Driven Development Framework: Business Analysts, Developers, Testers, and others can use a to create a readable and easily understandable format.

 

  • Data-Driven Testing Framework: This framework helps to separate test data from test script logic by storing test data as key-value pairs in an external database. 

  • These keys can be used to both access and populate data in the test scripts.

 

  • Keyword-Driven Testing Framework: This is a variation on the data-driven testing framework. It not only separates test data and test-script logic, but it also stores a portion of the test script code in an external location.

 

  • Library Architecture Testing Framework: This type of framework groups common steps into functions under a library and calls these functions as and when they are needed.

 

  • Module-Based Testing Framework: In this framework, each test application is divided into several isolated and logical modules, each with its own test script.

 

  • Hybrid Testing Framework: This type of framework combines the above-mentioned frameworks and takes advantage of all of their strengths.

 

Robot Framework is an open-source, modular automation framework that can work with third-party libraries and functions. A test automation runner or an automation wrapper is required to run a web testing library like Selenium, which is provided in the form of a Robot Framework. Other common test runners for the same purpose includeMSTest, TestNG, Nunit, Junit, etc.

 

 

 9. Is Selenium free of technical difficulties?

 

Selenium has several technical challenges.

 

  • Only web-based applications are supported by Selenium.

  • The Bitmap comparison is not supported.

  • Any reporting-related capabilities must rely on third-party software.

  • In comparison to commercial tools like HP UFT, the tool has no vendor support.

  • Maintainability of objects becomes difficult in Selenium because there is no concept of an object repository.

 

 


10. What are your thoughts on Jenkins? What are the advantages of using it in conjunction with Selenium?

 

Jenkins, developed by Hudson Lab, is the most widely used open-source continuous integration tool. It’s cross-platform, which means it’ll work on Windows, Linux, Mac OS, and Solaris. Jenkins is a Java-based programme. Jenkin’s primary function is to track any job, such as SVN (Apache Subversion) checkouts, cron jobs, or application states. When a specific event occurs in an application, pre-configured actions are triggered.

 

  • Jenkins, for example, generates a list of all changes made in SVN repositories.

  • Jenkins keeps track of the most recent build or failed build and provides permanent links for easy communication.

  • Jenkins is easy to set up using either a direct installation file (exe) or a war file for application server deployment.

  • Jenkins can be configured to send the build status content to an email address.

  • Jenkins’ simple configuration makes setting up multiple tasks a breeze.

  • Jenkins can be set up to run an automated test build on TestNg after each SVN commit.

  • The details of the jar, its version, and the mapping of build and jar numbers are all documented by Jenkins.

  • Plugins: Jenkins can be configured to use third-party plugins for additional features and functionality.

  • We use Jenkins with Selenium for the following reasons:

  • When you use Jenkins to run Selenium tests, you can do so whenever your programme changes, and if the tests pass, you can deploy the software to a new environment.

  • Jenkins could run your tests at a specific time.

  • It is possible to save the execution history as well as the Test Reports.

  • Using Maven and Jenkins, you can develop and test a project in continuous integration.



11. In the Selenium IDE, explain How are you going to debug the tests?

 

  • Place a breakpoint at the point where you want to run the test step by step.

  • Execute the test case.

  • The execution will be paused at the specified breakpoint.

  • Click the blue-button to move on to the next statement.

  • To continue running all of the commands at once, click the “Run” button.

 

 

12. How do you get the message from an alert box back?


The storeAlert command will retrieve the message from the alert popup and store it in a variable.

 

 

 

 

13. What is RC (Remote Control) selenium?

 

In terms of browser and language support, Selenium IDE has some limitations. RC limitation can be reduced by using Selenium.

  • For automating web applications, selenium RC is used with languages such as Java, C#, Perl, and Python on various platforms and web browsers.

  • Selenium RC is a java-based tool that can interact with a web application using any language.

  • You can get around the restriction by using a server to run your automation script against any web application.

 

 

14. What is the primary distinction between web-driver and RC?


The main difference between Selenium RC and Webdriver is that when a page is loaded, Selenium RC injects javascript functions into browsers. Selenium Webdriver, on the other hand, uses browsers with built-in support 85 to drive the browser.

 

 

15. What are some of the benefits of RC?

 

RC has several advantages.

 

  • Can read and write data from and to.xls,.txt, and other formats.

  • It can handle dynamic objects and UI elements that use Ajax.

  • For improved performance and flexibility, loops and conditions can be used.

  • Many programming languages and operating systems are supported.

  • Selenium RC can be used in any browser that supports JAVA scripts.

 

 

 

16. Is it possible to use Selenium RC without Selenium Grid to run tests on two different browsers on the same operating system?

 

When you don’t use the JAVA testing framework, it is possible. If you use the Selenium java client driver instead of the Java testing framework, TestNG allows you to do this. You can set tests to run in parallel and define two different tests, each using a different browser, by using the “parallel=test” attribute.

 

 

 

17. Why use Selenium RC with TestNG?

 

You’ll need a way to run the tests from a command-line process, reports that tell you what happened, and flexibility in how you build your test suites if you want full automation across multiple servers and client platforms.  TestNG provides that flexibility.

 

 

 

18. What are Breakpoints and Start Points in Selenium?


Breakpoints: When you use a breakpoint in your code, the execution will come to a complete halt. This allows you to ensure that your code is functioning properly.

 

Start point: The start point specifies where the execution should begin. When you want to run the test script from the middle of the code or from a breakpoint, you can use the start point.

 

 

 

 

19. Explain why Python is preferred over Java in Selenium.

 

  • That Java programs tend to run slower compared to Python programs.

  • Java uses traditional braces to start and ends blocks, while Python uses indentation.

  • Java employs static typing, while Python is dynamically typed.

  • Python is simpler and more compact compared to Java.

 

 

 

20. Mention the difficulties in using Selenium Webdriver to handle Ajax calls.


Handling Ajax Calls in Selenium Webdriver presents a number of challenges.

 

  • The “pause” command is not completely reliable when handling Ajax calls. Long pause times make the test unacceptably slow and lengthen the time it takes to complete. In testing Ajax applications, “wait for condition” will be more useful.

 

  • It’s difficult to determine the level of risk associated with specific Ajax applications.

 

  • Giving developers complete control over Ajax applications complicates the testing process.

 

  • AJAX applications frequently use different encoding or serialisation techniques to submit POST data, making it difficult for testing tools to create automated test requests.

This is the end of our topic. We hope we helped you in some way. The topics covered in this Core Selenium Interview Questions blog are among the most sought-after skillsets for a Selenium professional, according to recruiters. These  Selenium Interview Questions will undoubtedly assist you in acing your job interview.


Best wishes for your interview!


If you still have any queries, please let us know in the comment section.