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Selenium Interview Questions

Selenium Interview Questions

An Overview of Selenium

An open source and free to use automation test tool, Selenium is used to test web applications. Developers use this tool to run test cases directly in web browsers. Selenium supports most of the popular web browsers, including IE, Chrome, Firefox, Safari, and Opera. Developers are free to use programming languages such as Java, Javascript, Python, and PHP to write a test case in Selenium and then running the script to verify test cases in most of the popular web browsers. We have added interview -specific information to our Selenium Interview Questions. Do not forget to read them!

Developers can run automation test scripts in Windows, Linux an Mac, and can be deployed on Android, iOS and Windows. Selenium is recognized as the most portable, open source test tool for web application automation. You can now read our updated and huge collection of Selenium Interview Questions.

Development History

Selenium is a collection of different test tools, and therefore different developers played a role in its development. But primarily, Selenium is the brainchild of Jason Huggins who built it in 2004. With a goal to avoid repetitious manual testing of a web application, Huggins created a JavaScript program to control browser's actions. This program was called JavaScriptTestRunner, which later became Selenium Core. This information can be asked during Basic Selenium Interview Questions.

Latest Version

The latest version of Selenium available is 3.14, which was released in August 2018. Get more knowledge on this if you are preparing for Advanced Selenium Interview Questions.

Last update: 06 Apr 2019, 19 Questions and Answers

Most Frequently Asked Selenium Interview Questions And Answers With Examples:

  • It is free and open source
  • Has large user base and online communities
  • Cross-browser compatibility
  • Platform compatibility
  • Supports most of the programming languages
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The Selenium suite includes 4 set of tools:

 

1. Selenium Integrated Development Environment (IDE): It is a record and playback tool, which is distributed as a Firefox Plugin.

2. Selenium Remote Control (RC): It is a server that allows users to create test scripts in the programming language of their choice. It also allows developers to execute test scripts cross browsers.

3. Selenium WebDriver: This tool communicates directly with the browser and uses native compatibility to automate.

4. Selenium Grid: It is used to distribute test execution on multiple platforms and environments

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Selenium supports two types of testing - Functional Testing and Regression Testing.

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It is the easiest and simplest tool in the Selenium Package. Two features - record and playback - make this tool very easy to learn with minimum knowledge of other programming languages. Selenium IDE is the best tool for new users.

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It is the language for writing test scripts in Selenium IDE.

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The locator is an address that identifies a web element within the page. Different types of locators are used to identify different web elements accurately in Selenium:

  • ID
  • ClassName
  • Name
  • TagName
  • LinkText
  • PartialLinkText
  • Xpath
  • CSS Selector
  • DOM
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S.no Assert command Verify command
1. Sees if a given condition is true or false. Sees if the condition is true or false
2. If the condition is true, program control will execute the next test step. Irrespective the conditions are true or false; the program does not stop.
3. If the condition is not true, execution will stop, and no test will be executed. All of the test steps get executed.
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XPath can help the developers locate web elements based on their XML path. The logic behind establishing HTML elements using XPath is the crossing between different parts across the page, which enables a user to find the item through the reference to another aspect.

 

If you are preparing for Selenium interviews, you can have a look at our Advanced Selenium Interview Questions for better insight.

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Selenium IDE Selenium RC WebDriver
Only supports Firefox Supports a range of browsers like Firefox, Chrome, IE, and Opera Supports Firefox, Chrome, IE, Opera, and HtmlUnitDriver.
Supports playback and record features Does not support record and playback Does not support record and playback
Does not require server before executing test scripts Needs server before executing test scripts Does not require server before executing test scripts
Javascript-based framework JavaScript-based framework Uses browser's native compatibility for automation
Not object-oriented Semi object-oriented Completely object-oriented

 

You are expected to know this information during Selenium Interview Questions With Answers.

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Selenium Grid is used for executing test scripts on multiple platforms and cross-browsers simultaneously to achieve distributed test execution under different environments, thus saving program execution time.

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Selenium RC and WebDriver, when combined, are known as Selenium 2. Selenium RC is also known as Selenium 1.

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Two types of waits are available in WebDriver - Implicit Wait and Explicit Wait.

Implicit waits provide default waiting time between each consecutive test step across the test script. Therefore, subsequent test steps will execute only when the waiting time has elapsed after the previous test step.

Explicit waits halt the execution till the time a given condition is met or the maximum wait time has elapsed. Unlike Implicit wait, the explicit wait can be applied only in particular instances.

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findElement(): This is used to find the first element on the existing web page matching the specified locator value. You must remember that only first matching element will be fetched.

findElements(): This is used to find all of the elements in the existing web page matching the specified locator value. You must remember that all of the matching elements will be fetched and saved in the WebElements list.

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S.no close() quit()
1. Closes the browser window currently being used or accessed by WebDriver Closes down all the windows that were opened by the program
2. Neither requires parameters nor returns values. Neither requires parameters nor returns values.
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No. Selenium is an automation testing tool that only supports web application testing. It cannot handle Windows pop-ups.

This is one of the frequently asked Selenium Interview Questions.

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WebDriver offers an efficient way to handle web-based pop-ups using the Alert interface. Developers can use the below mentioned four methods, along with the Alert interface, for treating web-based pop-ups:

  • void dismiss(): Accept() way clicks “Cancel” when window pop-ups appear.
  • void accept(): Accept() method clicks “Ok” button when window pop-ups appear.
  • String getText(): GetText() method returns the text shown on alert box.
  • void sendKeys(String stringToSend): SendKeys() method enters specified string pattern into alert box.
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It is a unit testing framework, which was introduced by Apache. This framework is based on Java.

 

Following are JUnit Annotations:

  • @Test: This annotation tells the system that any method that is annotated as @Test is test method. You can have multiple test methods in one script.
  • @Before: This shows the system that this method will be executed every time before the test method.
  • @After: This method tells the system that this method will get performed every time after the test method.
  • @BeforeClass: This method determines the system that this method will get performed once before any of the test methods.
  • @AfterClass: This method determines the system that this method will get performed once after the test method.
  • @Ignore: It shows the system that this method will not be implemented.
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TestNG is an advanced framework that helps both developers and testers leverage the benefits. An open source framework, it is distributed under the Apache Software License.

These features make TestNG better than Junit:

  • Tests to confirm the code is multithread safe
  • Supports data-driven testing
  • Supports parameters
  • Includes a variety of tools and plug-ins
  • Flexible test configuration
  • Possible to set test case dependencies
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S.no Selenium QTP
1. Open source License required
2. Free of cost High price
3. Supports Windows, Linux, Mac Supports only Windows
4. Extensive language support Support only VB Script
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