Selenium Test Automation: Selenium Webdriver interview Questions

Part 1

1 : What Is Selenium WebDriver/Selenium 2?
Answer :

· Selenium WebDriver Is well designed object oriented API which Is developed to automate web and mobile applications testing process. WebDriver API Is bigger than Selenium RC but It's Architecture Is simple and easy to understand compared Selenium RC API.

· We can automate our web application testing process using selenium webdriver.

· We can say It advanced version of selenium RC because some limitations of selenium RC has been overcome In selenium WebDriver.

· WebDriver Is designed to provide better support for dynamic changing pages. Example : Web page elements changing without reloading the page. In this case WebDriver works better.

· Selenium Webdriver Is more faster that Selenium RC as It Is directly Interacting with web browsers and mimic the behavior of a real user. Example : User clicks on button of web page or moving mouse on main menu to get the sub menu list. WebDriver works Same.

· All popular browser vendors are active participants In selenium WebDriver's development and all of them have their own engineers team to Improve this framework.

You can Include answers of Question 2, Question 3, Question 4 and Question 5 In answer of this question If Interviewer need more detail on selenium webdriver.

2 : Tell Me WebDriver Supported Browsers?

Answer : Selenium WebDriver API has a many different drivers to test your web application In different browsers. List of Webdriver browser drivers are as bellow.

· Firefox Driver - For Mozilla Firefox browser

· Internet Explorer Driver - For Internet Explorer browser

· Chrome Driver - For Google Chrome browser

· HtmlUnit Driver - GUI-Less(Headless) browser for Java programs

· Opera Driver - For Opera browser

3 : Tell Me WebDriver Supported Mobile Testing Drivers?

Answer : We can get support of mobile application testing using Selenium webdriver. Selenium WebDriver supports bellow given drivers to test mobile application.

· AndroidDriver

· OperaMobileDriver

· IPhoneDriver

4 : Which Programming Languages Supported By Selenium WebDriver To Write Test Cases?

Answer : Selenium WebDriver Is very wast API and It support many different languages to write test cases for your software web application. List of WebDriver supported languages are as bellow.

· Java -> View Tutorials

· C#

· Python

· Ruby

· Perl

· PHP

5 : Which Different Element Locators Supported By Selenium WebDriver?
Answer : Selenium WebDriver supports bellow given element locators.

· XPath Locator -> View Example

· CSSSelector Locator -> View Example

· ClassName Locator -> View Example

· ID Locator -> View Example

· Name Locator -> View Example

· LinkText Locator -> View Example

· PartialLinkText Locator -> View Example

· TagName Locator -> View Example

Part 2

6 : What are the benefits of automation testing.

Answer : We can get bellow given benefits If automate our testing process.

· Fast Test Execution : Manual testing process Is time consuming. Automation tests are faster and takes less time to execute tests compared to manual test execution.

· Re-usability Of Test Cases : You need to prepare automation test cases only one time. Then you can use same test cases for all upcoming version release of software application. However you need to modify your test cases If there Is any flow change of business logic changes In software. But It Is less time consuming.

· Testing Cost Reduction : You have to put human efforts only one time to automate your test process. Latter on automation tool will work for you at place of human resource.

· Better Test Coverage In Each Version Release: You have to Implement test scenarios only once In your automation test cases. Latter on you can execute same test cases In all upcoming release. So each scenarios will be tested In every version release.

· Easy For Compatibility Testing : It Is easy to run same tests In combination of different OS and browser environments using automation tools.

7 : Does Selenium WebDriver Support Record And Playback Facility?

Answer : No. WebDriver do not have any record and playback facility. But you can record your tests In one of the selenium version called Selenium IDE and then you can export your recorded tests In webdriver compatible format as per your preferred language.

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYyTXeR_DQ_LS4vg2vWelyodaLoKMSbZ960mSsD8zkcrWewPSWjgB3nnrBstVuWfvW46oVDdeyy0jI2vj9C3-GunnHyd6DnlVtdLvSEMlw124d3-yX5DMZguIhjLC8BW_zMGgJrIqcjTol/s1600/Export+test+case+In+webdriver+formate.PNG

You can VIEW MORE TUTORIALS on selenium IDE or @ PART 1 andPART 2 for more details.

8 : Which Operating systems support Selenium WebDriver?
Answer : At present, Mainly bellow given operating systems support Selenium WebDriver.

· Windows - Windows XP, Windows 7, Windows 8 and Windows 8.1

· Apple OS X

· Linux - Ubuntu. Other versions of linux should support too.

9 : Selenium WebDriver Is Paid Or Open Source Tool? Why you prefer to use It?

Answer : All versions of selenium tool are open source. You can use any version of selenium In free of charge.

I choose to use It because

· Open Source.

· It has multi-browser support.

· Multi-OS support.

· Multi types of locators support. So If one not works, We can use another type.

· Web as well mobile application testing support.

· Many testers are using selenium WebDriver to automate their testing process. So getting solution of any complex Issue very easily on Internet.

· It Is extendable and flexible.

· Continues support from WebDriver's development team to Improve the API and resolve current Issues.

10 : Which OpenSource Framework Is Supported In WebDriver With Java?
Answer : Bellow given 2 java frameworks are supported by selenium WebDriver.

· JUnit

· TestNG

· Part 3

·
11 : Can you tell me the syntax to open/launch Firefox browser In WebDriver?

· Answer : We can open new Mozilla Firefox browser Instance using bellow given syntax.

· WebDriver driver = new FirefoxDriver();

· VIEW PRACTICAL example.

12 : What Is XPath and what Is use of It In WebDriver?

· Answer : In Selenium WebDriver, XPath is used to locate the elements. Using XPath, We can navigate through elements and attributes In an XML document to locate webpage elements like buttons, text box, links, Images etc..

· 13 : Which tool you are using to find the XPath of any element?

· Answer : I am using Mozilla Firefox AddOns FireBug and FirePath to find the XPath of web elements.

VIEW MORE TUTORIALS ON SELENIUM WEBDRIVER

· 14 : What is the difference between absolute XPath and relative XPath?

· Answer :

Absolute XPath : Absolute XPath Is the full path starting from root node and ends with desired descendant element's node. It will start using single forward slash(/) as bellow.

· Example Of Absolute XPath :

· /html/body/div[3]/div[2]/div[2]/div[2]/div[2]/div[2]/div[2]/div/div[4]/div[1]/div/div/div/div[1]/div/div/div/div[1]/div[2]/form/table/tbody/tr[1]/td/input

· Above XPath Is absolute XPath of calc result box given on THIS PAGE. It starts top node html and ends with input node.

· Relative XPath : Instead of starting from root node, Relative XPath starts from any In between node or current element's node(last node of element). It will start using double forward slash(//) as bellow.
Example Of Relative XPath :

· //input[@id='Resultbox']

·

Above XPath Is relative XPath of same calc result box given on THIS PAGE.

· 15 : How To Handle Dynamic Changing IDs In XPath.
Example : //div[@id='post-body-3647323225296998740']/div[1]/form[1]/input[1]
In this XPath "3647323225296998740" Is changing every time when reloading the page. How to handle this situation?

·
Answer : There are many different alternatives In such case.

Alternative 1 : Look for any other attribute which Is not changing every time In that div node like name, class etc. So If this div node has class attribute then we can write xpath as bellow.

· //div[@class='post-body entry-content']/div[1]/form[1]/input[1]

·
Alternative 2 : You can use absolute xpath(full xpath) where you not need to give any attribute names In xpath.

· /html/body/div[3]/div[2]/div[2]/div[2]/div[2]/div[2]/div[2]/div/div[4]/div[1]/div/div/div/div[1]/div/div/div/div[1]/div[2]/div[1]/form[1]/input[1]

·
Alternative 3 : Use starts-with function. In this xpath's ID attribute, "post-body-" part remain same every time. So you can use xpath as bellow.

· //div[starts-with(@id,'post-body-')]/div[1]/form[1]/input[1]

·
Alternative 4 : Use contains function. Same way you can use contains function as bellow.

· div[contains(@id,'post-body-')]/div[1]/form[1]/input[1]

Part 4

16 : How to press ENTER key button on text box In selenium webdriver?

Answer : To press ENTER key using selenium WebDriver, We need to use selenium Enum Keys with Its constant ENTER as bellow.

driver.findElement(By.xpath("//input[@id='gbqfq']")).sendKeys(Keys.ENTER);

17 : How many types of waits available In selenium WebDriver

Answer : There are two types of waits available In selenium WebDriver.

1. Implicit Wait

2. Explicit Wait

VIEW TUTORIALS on Implicit and Explicit Waits with practical examples detailed description.

18 : What Is Implicit Wait In Selenium WebDriver?

Answer : Sometimes, Elements are taking time to be appear on page. Using Implicit wait In webdriver test case, We can poll the DOM for certain amount of time when some element or elements are not available Immediately on webpage.

Implicit Wait Example :

driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

If you will write above syntax In your test, Your WebDriver test will wait 10 seconds for appearing element on page.

19 : What Is Explicit Wait In Selenium WebDriver?

Answer : Using explicit wait code In selenium webdriver, You can define to wait for a certain condition to occur before proceeding further test code execution.

Explicit Wait Example :

WebDriverWait wait = new WebDriverWait(driver, 20);

wait.until(ExpectedConditions.elementToBeClickable(By.xpath("//input[@id='gbqfq']")));

Above code will wait for 20 seconds for targeted element to be displayed and enabled or we can say clickable.

20 : I wants to pause my test execution for fix 10 seconds at specific point. How can I do It?

Answer : You can use java.lang.Thread.sleep(long milliseconds) method to pause the test execution for specific time. If you wants to pause your test execution for 10 seconds then you can use bellow given syntax In your test.

Thread.sleep(10000);

Part 5

21 : How does selenium RC drive the browser?

Answer :
When browser loaded In Selenium RC, It ‘injected’ javascript functions into the browser and then It Is using javascript to drive the browser for application under test.

22 : How does the selenium WebDriver drive the browser?

Answer : Selenium webdriver works like real user Interacting with web page and Its elements. It Is using each browser's native support to make direct calls with browser for your application under test. There Is not any Intermediate thing In selenium webdriver to Interact with web browsers.

VIEW MORE TUTORIALS on selenium WebDriver.

23 : Do you need Selenium Server to run your tests In selenium WebDriver?

Answer : It depends. If you are using only selenium webdriver API to run your tests and you are running your all your tests on same machine then you do not need selenium server because In this case, webdriver can directly Interact with browser using browser's native support.

You need selenium server with webdriver when you have to perform bellow given operations with selenium webdriver.

· When you are using remote or virtual machine to run your webdriver tests and that machine have specific browser version that is not on your current machine.

· When you are using selenium-grid to distribute your webdriver's test execution on different remote or virtual machines.

24 : Bellow given syntax will work to navigate to specified URL In WebDriver? Why?

driver.get("www.google.com");

Answer : No. It will not work and show you an exception like : "Exception in thread "main" org.openqa.selenium.WebDriverException: f.QueryInterface is not a function" when you run your test.

You need to provide http:// protocol with URL In driver.get method as bellow.

driver.get("http://www.google.com");

Now It will work.

25 : Tell me a reason behind bellow given WebDriver exception and how will you resolve It?

"Exception in thread "main" org.openqa.selenium.NoSuchElementException: Unable to locate element"

Answer : You will get this exception when WebDriver Is not able to locate element on the page using whatever locator you have used In your test. To resolved this Issue, I will check bellow given things.

· First of all I will check that I have placed Implicit wait code In my test or not. If you have not placed Implicit timeout In your test and any element Is taking some time to appear on page then you can get this exception. So I will add bellow given line at beginning of my test case code to wait for 15 seconds for element to be present on page. In 70% cases, this step will resolved Issue. View Practical Example Of Implicit Wait.

driver.manage().timeouts().implicitlyWait(15, TimeUnit.SECONDS);

· Another reason behind this Issue Is element's ID Is generated dynamically every time when reloading the page. If I have used element's ID as an element locator or used It In xpath to locate the element then I need to verify that ID of element remains same every time or It Is changing? If It Is changing every time then I have to use alternative element locating method. In 20% cases, This step will resolve your Issue.

· If Implicit wait Is already added and element locator Is fine then you need to verify that how much time It(element) Is taking to appear on page. If It Is taking more than 15 seconds then you have to put explicit wait condition with 20 or more seconds wait period as bellow. In 5 to 10% cases, This step will resolve your Issue. View Example.

WebDriverWait wait = new WebDriverWait(driver, 25);

wait.until(ExpectedConditions.elementToBeClickable(By.cssSelector("#submitButton")));

Part 6

26 : Can we automate desktop application's testing using selenium WebDriver?

Answer : No. This Is the biggest disadvantage of selenium WebDriver API. We can automate only web and mobile application's testing using selenium WebDriver.

27 : Can you tell me the alternative driver.get() method to open URL In browser?

Answer : We can use anyone from bellow given two methods to open URL In web browser In selenium webdriver.

1. driver.get()

2. driver.navigate().to()

28 : Can you tell me a difference between driver.get() and driver.navigate() methods?

Answer : Main and mostly used functions of both methods are as bellow.

driver.get()

· driver.get() method Is generally used for Open URL.

· It will wait till the whole page gets loaded.

driver.navigate()

· driver.navigate() method Is generally used for navigate to URL, navigate back, navigate forward, refresh the page.

· It will just navigate to the page but wait not wait till the whole page gets loaded.

View more detailed description with example.

29 : WebDriver has built In Object Repository. Correct me If I am wrong.

Answer : No. WebDriver do not have any built In object repository till now. But yes, I am using java .properties file In my framework to store all required element objects In my tests. View Example.

30 : Can you tell me syntax to set browser window size to 800(Width) X 600(Height)?

Answer : We can set browser window size using setSize method of selenium webdriver. To set size at
800 X 600, Use bellow given syntax In your test case.

driver.manage().window().setSize(new Dimension(500,500));

Part 7

31 : Can you tell me the names of different projects of selenium?

Answer : At present, Selenium has four different projects as bellow.

· Selenium IDE : It Is Firefox add-on which allows you to record and playback your tests In Firefox browser.

· Selenium RC : It Is web application automation tool which allows you to write your tests In many different programming languages.

· Selenium WebDriver : It Is well designed object oriented API developed to automate web and mobile application testing process. You can write your tests In different languages too In selenium webdriver.

· Selenium Grid : Grid allows you to execute your tests In parallel by distributing them on different machines having different browser/OS combinations.

32 : I wants to use java language to create tests with Selenium WebDriver. Can you tell me how to get latest version of WebDriver?

Answer : You can download language specific latest released client drivers for selenium WebDriver at http://docs.seleniumhq.org official website. For java language, You will get bunch of jar files In zip folder. And then you can add all those jar files In your project's java build path as a referenced libraries to get support of webdriver API.

33 : Can you tell me the usage of "submit" method In selenium WebDriver?

Answer : We can use submit method to submit the forms In selenium WebDriver. Example : Submitting registration form, submitting LogIn form, submitting Contact Us form ect.. After filling all required fields, We can call submit method to submit the form. VIEW EXAMPLE.

34 : Do you have faced any Issue with "submit" method any time?

Answer : Yes, I have faced Issue like submit method was not working to submit the form. In this case, Submit button of form was located outside the opening <form> and closing </form> tags. In this case submit method will not works to submit the form.

Also If submit button Is located Inside opening <form> and closing</form> tags but that button's type tag's attribute Isn't submit then submit method will not work. It(type tag's attribute) should be always submit.

35 : What Is the syntax to type value In prompt dialog box's Input field using selenium WebDriver?

Answer : Prompt dialog Is just like confirmation alert dialog but with option of Input text box as bellow.

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioTxxJl1lpaqsPa70J23UQXR8g7THYDMOWduC1_oXv6zutJOQhYRfDOksW2P5RL9oqZ6RDL4GYoQXmfmPtpzScmB5AN8NutPzy6I6ZTf0CltqaX6nprNXaNrLVrjgZGbrZSLmyHkyXNU0t/s1600/Prompt+webdriver.PNG

To Input value In that text box of prompt dialog, You can use bellow given syntax.

driver.switchTo().alert().sendKeys("Jhon");

Part 8

36 : When I am running tests In Firefox Browser using selenium webdriver, It Is not showing me any bookmarks, addons, saved passwords etc. In that browser. Do you know why?

Answer : Yes. It Is because all those bookmarks, addons, passwords etc.. are saved In your regular browser's profile folder so when you launch browser manually, It will use existing profile settings so

It will show you all those stuffs. But when you run your tests In selenium webdriver, It Is opening new browser Instance with blank/new profile. So It will not show you bookmarks and all those things In that browser Instance.

You can create custom firefox profile and then you can use It In selenium webdriver test. In your custom profile, you can set all required bookmarks, addons etc.. VIEW THIS EXAMPLE to know how to set custom profile of firefox browser.

37 : Arrange bellow given drivers In fastest to slowest sequence?

Firefox Driver, HtmlUnit Driver, Internet Explorer Driver.

Answer : HTMLUnit Driver Is faster than all other drivers because It Is not using any UI to execute test cases. Internet Explorer driver Is slower than Firefox and HtmlUnit driver. So, Fastest to slowest driver sequence Is as bellow.

1. HtmlUnit Driver

2. Firefox Driver

3. Internet Explorer Driver

38 : What Is Ajax?

Answer : Asynchronous JavaScript and XML Is full form of AJAX which Is used for creating dynamic web pages very fast. Using ajax, We can update page behind the scene by exchanging small amounts of data with server asynchronously. That means, Using ajax we can update page data Without reloading page.

39 : How to handle Ajax In selenium WebDriver?

Answer : Generally we are using Implicit wait In selenium WebDriver to wait for some element to be present on page. But Ajax call can not be handled using only Implicit wait In your test because page not get reloaded when ajax call sent and received from server and we can not assume how much time It will take to receive ajax call from server.

To handle ajax call In selenium WebDriver, We needs to use webdriver's FluentWait method or Explicit Waits which can wait for specific amount of time with specific condition. You can get different Explicit Waits examples links on THIS PAGE.

40 : On Google search page, I wants to search for some words without clicking on Google Search button. Is It possible In WebDriver? How?

Answer : Yes we can do It using WebDriver sendKeys method where we do not need to use Google Search button. Syntax Is as bellow.

driver.findElement(By.xpath("//input[@id='gbqfq']")).sendKeys("Search Syntax",Keys.ENTER);

In above syntax, //input[@id='gbqfq'] Is xPath of Google search text field. First It will enter "Search Syntax" text In text box and then It will press Enter key on same text box to search for words on Google.

Part 9

41 : What kind of testings are possible using selenium WebDriver? We can use It for any other purpose except testing activity?

Answer : Generally we are using selenium WebDriver for functional and regression testing of software web applications. We can also use It for data entry kind of work like submitting online
forms using different data

42 : Give me any five different xPath syntax to locate bellow given Input element.

Answer : Five xPath syntax for above element are as bellow.

//input[@id='fk-top-search-box']

//input[contains(@name,'q')]

//input[starts-with(@class, "search-bar-text")]

//input[@id='fk-top-search-box' or @name='q']

//input[starts-with(@id, 'fk-top-search-box') and contains(@class,'fk-font-13')]

See detailed tutorial on How To Locate XPath Of Element.

43 : Can you tell me two drawbacks of xPath locators as compared to cssSelector locator?

Answer : Two main disadvantage of xPath locator as compared to cssSelector locator are as bellow.

· It Is slower than cssSelector locator.

· xPath which works In one browser may not work In other browser because some browsers (Ex. IE) reads only Lower-cased tag name and Attribute Name. So If used It In upper case then It will work In Firefox browser but will not work In IE browser. Every browser reads xPath In different way. In sort, do not use xPath locators In your test cases If you have to perform cross browser testing using selenium WebDriver.

44 : Why xPath locator Is much more popular than all other locator types In WebDriver?

Answer : xPath locators are so much popular In selenium webdriver test case development because

· It Is very easy to learn and understand for any new user.

· There are many functions to build xPath In different ways like contains, starts-with etc.. So If one Is not possible you will have always another option to build xPath of any element.

· Presently many tools and add-ons are available to find xpath of any element.

45 : Give me WebDriver's API name using which we can perform drag and drop operation.

Answer : That API's name Is Advanced User Interactions API using which we can perform drag and drop operation. Same API can help us to perform some other operations too like moveToElement, doubleClick, clickAndHold, moveToElement, etc..

View Example1 and Example2 for dragging and dropping element.

Part 10

46 : Can we perform drag and drop operation In Selenium WebDriver? Tell me a syntax to drag X element and drop It On Y element.
Answer : Yes, We can perform drag and drop operation using selenium webdriver's Advanced User Interactions API. Syntax Is like bellow.

new Actions(driver).dragAndDrop(X, Y).build().perform();

View Practical Example

47 : Do you have faced any technical challenges with Selenium WebDriver test automation?

Answer : Yes, I have faced bellow given technical challenges during selenium webdriver test cases development and running.

· Sometimes (Not always), Some elements like text box, buttons etc. are taking more time(more than given Implicit wait time) to appear on page or to get enabled on page. In such situation, If I have used only Implicit wait then my test case can run fine on first run but It may fail to find element on second run. So we need provide special treatment for such elements so that webdriver script wait for element to be present or get enabled on page during test execution. We can use Explicit wait to handle this situation. You can find different explicit wait example links on THIS PAGE.

· Handling dynamic changing ID to locate element Is tricky. If element's ID Is changing every time when you reload the page and you have to use that ID In XPath to locate element then you have to use functions like starts-with(@id,'post-body-') or contains(@id,'post-body-') In XPath. Other alternate solutions to handle this situation are described in answer of Question 15 of THIS PAGE.

· Clicking on sub menus which are getting rendered on mouse hover of main menu Is some what tricky. You need to use webdriver's Actions class to perform mouse hover operation. You can VIEW FULL EXAMPLE on how to generate mouse hover event on main menu.

· If you have to execute your test cases In multiple browsers then one test case can run successfully In Firefox browser but same test case may fail In IE browser due to the timing related Issues (nosuchelement exception) because test execution In Firefox browser Is faster than IE browser. You can resolve this Issue by Increasing Implicit wait time when you run your test In IE browser.

· Above Issue can arise due to the unsupported XPath In IE browser. In this case, You need to you OTHER ELEMENT LOCATING METHODS (ID, Name, CSSSelector etc.)to locate element.

· Handling JQuery elements like moving pricing slider, date picker, drag and drop etc.. Is tricky. You should have knowledge of webdriver's Advanced User Interactions API to perform all these actions. You can find few example links for working with JQuery Items on THIS PAGE.

· Working with multiple Windows, Frames, and some tasks like Extracting data from web table, Extracting data from dynamic web table, Extracting all Links from page, Extracting all text box from page are also tricky and time consuming during test case preparation.

· There Is not any direct command to upload or download files from web page using selenium webdriver. For downloading files usign selenium webdriver, You need to create and set Firefox browser profile with webdriver test case. You can VIEW PRACTICAL EXAMPLE.

· Webdriver do not have any built In object repository facility. You can do It using java .properties file to create object repository as described In THIS EXAMPLE.

· Webdriver do not have any built In framework or facility using which we can achieve bellow given tasks directly : 1. Capturing screenshots, 2. generating test execution log, 3. reading data from files, 4. Generating test result reports, Manage test case execution sequence. To achieve all these tasks, We have to use external services with webdriver like Log4J to generate log, Apache POI API to read data from excel files, Testng XSLT reports to generate test result reports. TestNG to manage test case execution, .properties file to create object repository. All these tasks are very time consuming. ON THIS PAGE, I have described how to create data driven framework step by step for selenium webdriver. That framework contains all above functionality.

You can share other webdriver technical challenges which you have faced by commenting bellow so that your experience can help to others too.

Part 11

48 : Can you tell me a syntax to close current webdriver Instance and to close all opened webdriver Instances?

Answer :
Yes, To close current WebDriver Instance, We can use Close() method as bellow.

driver.close();

If there are opened multiple webdriver Instances and wants to close all of them then we can use webdriver's quit() method as bellow.

driver.quit();

49 : Is It possible to execute javascript directly during test execution? If Yes then tell me how to generate alert by executing javascript In webdriver script?

Answer :
Yes, we can execute javascript during webdriver test execution. To generate alert, You can write bellow given code In your script.

JavascriptExecutor javascript = (JavascriptExecutor) driver;

javascript.executeScript("alert('Javascript Executed.');");

VIEW DIFFERENT EXAMPLES to see usage of WebDriver's JavascriptExecutor.

50 : Give me a syntax to read javascript alert message string, clicking on OK button and clicking on Cancel button.

Answer :
We can read alert message string as bellow.

String alrtmsg = driver.switchTo().alert().getText();

We can click on OK button of alert as bellow.

driver.switchTo().alert().accept();

We can click on Cancel button of alert as bellow.

driver.switchTo().alert().dismiss();

VIEW PRACTICAL EXAMPLE to handle alert, Confirmation And Prompt popups.

51 : Tell me a scenario which we can not automate In selenium WebDriver.

Answer :
1. Bitmap comparison Is not possible using selenium webdriver.
2. Automating captcha Is not possible. (Few peoples says we can automate captcha but I am telling you If you can automate any captcha then It Is not a captcha).
3. We can not read bar code using selenium webdriver.

52 : What Is JUnit?

Answer : Java developers use JUnit as unit testing framework to write repeatable tests for java programming language. It Is very simple and open source framework and we can use It In selenium webdriver test scripts creation to manage them In well manner.

Part 12

53 : Which Is the latest version of JUnit.

Answer : Current latest version of JUnit Is 4.12-beta-2. This can change In future. To check latest released version of JUnit, You can Visit JUnit Official WebSite.

54 : Tell me different JUnit annotations and Its usage.

Answer : JUnit has bellow given different annotations.

· @Test : @Test annotation Is useful to Identify method as a Test method.

· @Before : @Before annotation method will be executed before each and every @Test method.

· @After : @After annotation method will be executed after each and every @Test method.

· @BeforeClass : @BeforeClass annotation method will be executed before all @Test methods In a class(Means before first @Test method).

· @AfterClass : @AfterClass annotation method will be executed after all @Test method In a class(Means after last @Test method).

· @Ignore : @Ignore annotation Is useful to exclude @Test method from execution. VIEW EXAMPLE

· @Test(timeout=1000) : You can set @Test method execution timeout. This @Test method fails Immediately when Its execution time cross 1000 milliseconds.

VIEW PRACTICAL EXAMPLE of JUnit annotations with selenium webdriver.

55 : Write sample JUnit @Test method that passes when expected ArithmeticException thrown.

Answer : Sample JUnit @Test to pass on expected ArithmeticException Is as bellow.

@Test(expected = ArithmeticException.class)

public void excOnDivision() {

int i = 5/0;

}

VIEW PRACTICAL EXAMPLE for Junit Timeout And Expected Exception Test.

56 : Write sample JUnit @Test method that fails when unexpected ArithmeticException thrown.

Answer : Sample JUnit @Test to fail on unexpected ArithmeticException Is as bellow.

@Test

public void excOnDivision() {

int i = 5/0;

}

57 : What are the advantages of TestNG over JUnit.

Answer : Advantages of TestNG over JUnit JUnit are as bellow.

 TestNG Annotations are simple and Easy to understand.

 Easy to parameterize the test cases In TestNG.

 Easy to run test cases In parallel.

 Can generate Interactive XSLT test execution reports using TestNG.

Part 13

58 : Tell me main features of JUnit.

Answer : JUnit features are as bellow.

· JUnit Is unit testing framework. So It helps developers to create and run unit test cases very easily.

· There are many different annotations available In JUnit. Using all those annotations, we can Identify and configure webdriver test case very easily.

· JUnit supports many different assertions using which we can compare webdriver test's expected and actual result.

· We can create test suite for multiple test cases to run all of them In one go using JUnit.

· We can generate webdriver test execution HTML reports using JUnit. VIEW EXAMPLE.

59 : What are different assertions supported by JUnit?

Answer : List of JUnit assertions as bellow.

1. assertEquals

2. assertFalse

3. assertTrue

4. assertNull

5. assertNotNull

6. assertSame

7. assertNotSame

8. assertArrayEquals

60 : How to create and run JUnit test suite for selenium WebDriver?

Answer : For creating JUnit test suite, we have to create test cases class files and one separate test suite file. Then we can write syntax like bellow In test suite file to run test suite.

@RunWith(Suite.class)

@SuiteClasses({ junittest1.class, junittest2.class })

public class junittestsuite {

}

In above example, junittest1.class and junittest2.class are test case class names.
VIEW PRACTICAL EXAMPLE on how to create and run JUnit test suite with selenium WebDriver.

61 : For what purpose, assertTrue and assertFalse assertions are used?

Answer : In selenium webdriver test, We need to assert Boolean conditions true and false. We can assert both these conditions using assertTrue and assertFalse JUnit assertions.

62 : Can you give me example of JUnit assertEquals assertion?

Answer : Example of JUnit assertEquals assertion Is as bellow. It assert that values of actTotal and expTotal are equal or not.

public void sumExample() {

int val1 = 10;

int val2 = 20;

int expTotal = 35;

int actTotal = 0;

actTotal = val1 + val2;

assertEquals(actTotal, expTotal);

}

Part 14

63 : What Is TestNG?

Answer : TestNG Is Open Source(Freeware) framework which Is Inspired from NUnit and JUnit with Introducing few new features and functionality compared to NUnit and JUnit to make It easy to use and more powerful.

We can use TestNg with selenium webdriver to configure and run test cases very easily, easy to understand, read and manage test cases, and to generate HTML or XSLT test reports.

You will find Selenium WebDriver with TestNG practical example Links on PAGE 1 and PAGE 2.

64 : Can you describe major features of TestNG?

Answer : TestNG has many major features like support of @DataProvider annotation to perform data driven testing, can set test case execution dependency, test case grouping, generate HTML and XSLT test execution report etc.. VIEW MORE FEATURES with detailed description.

65 : Describe the similarities and difference between JUnit and TestNG unit testing frameworks.

Answer : You can find all the similarities and difference between JUnit and TestNG framework on THIS PAGE.

66 : How to Install TestNG In Eclipse? How do you verify that TestNg Is Installed properly In Eclipse?

Answer : To Install TestNG In Eclipse, We have to follow steps as described on THIS PAGE.

67 : What are different annotations supported by TestNG ?

Answer : TestNG supports many different annotations to configure Selenium WebDriver test. You can see mostly used annotations list with detailed description and practical example link on THIS PAGE.

Part 15

68 : What Is the usage of testng.xml file?

Answer : In selenium WebDriver, We are using testng.xml file to configure our whole test suite In single file. Few of the tasks which we can specify In testng.xml file are as bellow.

· We can define test suite using set of test cases to run them from single place.

· Can Include or exclude test methods from test execution.

· Can specify a group to Include or exclude.

· Can pass parameter to use In test case.

· Can specify group dependencies.

· Can configure parallel test execution.

· Can define listeners.

69 : How to pass parameter with testng.xml file to use It In test case?

Answer : We can define parameter In testng.xml file using syntax like bellow.

Here, name attribute defines parameter name and value defines value of that parameter. Then we can use that parameter In selenium webdriver test case using bellow given syntax.

@Parameters ({"browser"})

VIEW FULL EXAMPLE on how to define and use parameter from testng.xml file.

70 : I have a test case with two @Test methods. I wants to exclude one @Test method from execution. Can I do It? How?

Answer : Yes you need to specify @Test method exclusion In testng.xml file as bellow.

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >

<exclude name="Your Test Method Name To Exclude"/>

</methods>

</class>

</classes>

</test>

</suite>

You need to provide @Test method name In exclude tag to exclude It from execution.

You can VIEW DETAILED EXAMPLE on how to exclude specific @Test method from execution.

71 : Tell me syntax to skip @Test method from execution.

Answer : You can use bellow given syntax Inside @Test method to skip It from test execution.

throw new SkipException("Test Check_Checkbox Is Skipped");

It will throw skip exception and @Test method will be sipped Immediately from execution. You can VIEW FULL EXAMPLE on how to skip @Test method from execution.

72 : Arrange bellow give testng.xml tags from parent to child.

<test>
<suite>
<class>
</methods>
</classes>

Answer : Parent to child arrangement for above testng tags Is as bellow.

<suite>
<test>
</classes>
<class>
</methods>

Part 16

73 : How to set priority of @Test method? What Is Its usage?

Answer : In your test case, you can set priority for TestNG @Test annotated methods as bellow.

@Test(priority=0)

Using priority, We can control @Test method execution manner as per our requirement. That

means @Test method with priority = 0 will be executed 1st and @Test method with priority = 1 will be executed 2nd and so on. VIEW PRACTICAL EXAMPLE to know how to use It.

74 : Tell me any 5 assertions of TestNG which we can use In selenium webdriver.

Answer : There are many different assertions available In TestNG but generally I am using bellow given assertions In my test cases.

1. assertEquals VIEW EXAMPLE

2. assertNotEquals VIEW EXAMPLE

3. assertTrue VIEW EXAMPLE

4. assertFalse VIEW EXAMPLE

5. assertNull VIEW EXAMPLE

6. assertNotNull VIEW EXAMPLE

75 : Can you tell me usage of TestNG Soft Assertion?

Answer : Using TestNG soft assertion, We can continue our test execution even if assertion fails. That means on failure of soft assertion, remaining part of @Test method will be executed and assertion failure will be reportedat the end of @Test method. VIEW PRACTICAL EXAMPLE.

76 : How to write regular expression In testng.xml file to search @Test methods containing "product" keyword.

Answer : Regular expression to find @Test methods containing keyword "product" Is as bellow.

<include name=".*product.*"/>

</methods>

VIEW EXAMPLE OF USING REGULAR EXPRESSION

77 : Which time unit we provide In time test? minutes? seconds? milliseconds? or hours? Give Example.

Answer : Time unit we provide on @Test method level or test suite level Is In milliseconds.You can VIEW FULL EXAMPLE to know how to set time out.

Part 17

78 : What Is the syntax to get value from text box and store It In variable.

Answer : Most of the time, String In text box will be stored as value. So we need to access value attribute(getAttribute) of that text box as shown In bellow example.

String Result = driver.findElement(By.xpath("//input[@id='Resultbox']")).getAttribute("value");

VIEW PRACTICAL EXAMPLE to get text from calc result text box.

79 : What Is the difference between findelement and findElements ?

Answer : findElement Is useful to locate and return single element from page while findElements Is useful to locate and return multiple elements from web page.

VIEW DETAILED DESCRIPTION WITH EXAMPLE.

80 : Tell me looks like XPath of sibling Input element which Is after Div in the DOM.

Answer : XPath for above scenario will be something like bellow.

//div/following-sibling::input

81 : Tell me looks like CSSSelector path of sibling Input element which Is after Div in the DOM.

Answer : CSSSelecor path will looks like bellow.

css=div + input

82 : What Is Parallelism In TestNG?

Answer : In general software term, Parallelism means executing two part of program simultaneously or executing program simultaneously or we can say multithreaded or parallel mode. TestNG has same feature using which we can start multiple threads simultaneously In parallel mode and test methods will be executed In them. VIEW PARALLELISM EXAMPLE.

Part 18

83 : What are the benefits of parallelism over normal execution?

Answer : Using parallelism facility of TestNG In selenium webdriver,

· Your test execution time will be reduced as multiple tests will be executed simultaneously.

· Using parallelism, We can verify multithreaded code In application.

84 : I wants to run test cases/classes In parallel. Using which attribute and value I can do It?

Answer : You have to use parallel = classes attribute In testng.xml to run tests parallel. VIEW EXAMPLE.

85 : What Is dependency test In TestNG?

Answer : Dependency Is very good feature of testng using which we can set test method as dependent test method of any other single or multiple or group of test methods. That means depends-on method will be executed first and then dependent test method will be executed. If depends-on test method will fail then execution of dependent test method will be skipped automatically. TestNG dependency feature will works only If depends-on test method Is part of same class or part of Inherited base class. DETAILED DESCRIPTION ON DEPENDENCY.

86 : What Is the syntax to set test method dependency on multiple test methods.

Answer : We can set test method's dependency on multiple test methods as bellow.

@Test(dependsOnMethods={"Login","checkMail"})

public void LogOut() {

System.out.println("LogOut Test code.");

}

Above test method Is depends on Login and checkMail test methods.VIEW EXAMPLE.

87 : What Is the syntax to set test method disabled.

Answer : We can use attribute enabled = false with @Test annotation to set test method disabled. Syntax Is as bellow.

@Test(enabled = false)

public void LogOut() {

System.out.println("LogOut Test code.");

}

Disabled test methods will be excluded automatically during execution.VIEW PRACTICAL EXAMPLE.

Part 19

88 : In XPath, I wants to do partial match on attribute value from beginning. Tell me two functions using which I can do It.

Answer : We can use bellow given two functions with XPath to find element using attribute value from beginning.

1. contains()

2. starts-with()

89 : I have used findElements In my test case. It Is returning NoSuchElementException when not element found. Correct me If I am wrong.

Answer : It Is Incorrect. findElements will never return NoSuchElementException. It will return just an empty list.

90 : My Firefox browser Is not Installed at usual place. How can I tell FirefoxDriver to use It?

Answer : If Firefox browsers Is Installed at some different place than the usual place then you needs to provide the actual path of Firefox.exe file as bellow.

System.setProperty("webdriver.firefox.bin","C:\\Program Files\\Mozilla Firefox\\Firefox.exe");

driver =new FirefoxDriver();

91 : How to create custom firefox profile and how to use It In selenium webdriver test?

Answer : You can view detailed answer for firefox custom profile onTHIS PAGE.

92 : What versions of Internet Explorer are supported by selenium WebDriver?

Answer : Till date, Selenium WebDriver supports IE 6, 7, 8, 9, 10 and 11 with appropriate combinations of Windows 7, Vista or XP.

Part 20

93 : Tell me the class name using which we can generate Action chain.

Answer : The WebDriver class name Using which we can generate Action chain Is "Actions". VIEW USAGE OF ACTIONS CLASS with practical example on how to generate series of actions to drag and drop element.

94 : Do you know method name using which we can builds up the actions chain?

Answer : Method name of Actions class to build up actions chain Is "build()". THIS EXAMPLE will show you how to build drag and drop element by x,y pixel actions using build() method.

95 : When we can use Actions class In Selenium WebDriver test case?

Answer : Few of the examples are bellow where can use actions class to perform operations In web application.

· Drag and drop element - VIEW EXAMPLE

· Drag and drop by x,y pixel offset - VIEW EXAMPLE

· Selecting JQuery selectable Items - VIEW EXAMPLE

· Moving JQuery slider - VIEW EXAMPLE

· Re-sizing JQuery re-sizable element - VIEW EXAMPLE

· Selecting date from JQuery date picker - VIEW EXAMPLE

96 : Can we capture screenshot In Selenium WebDriver? How?

Answer : We can use selenium webdriver TakesScreenshot method to capture screenshot. Java File class will be used to store screenshot In your system's local drive. You can view how to capture screenshot In selenium webdriver on THIS PAGE.

97 : Selenium WebDriver has any built In method using which we can read data from excel file?

Answer : No, Selenium webdriver do not have any built In functionality using which we can read data from excel file.

Part 21

98 : Do you know any external API name using which we can read data from excel file?

Answer :

· We can use jxl API (Java Excel API) to read data from excel file. VIEW EXAMPLE

· We can use one more powerful API known as Apache POI API to read and write data In excel file. I have created data driven framework using Apache POI API. You can VIEW DATADRIVEN FRAMEWORK CREATION TUTORIALS step by step.

99 : Tell me any 5 webdriver common exceptions which you faced during test case execution.

Answer : WebDriver's different 5 exceptions are as bellow.

1. TimeoutException - This exception will be thrown when command execution does not complete In given time.

2. NoSuchElementException - WebDriver will throw this exception when element could not be found on page.

3. NoAlertPresentException - This exception will be generated when webdriver ties to switch to alert popup but there Is not any alert present on page.

4. ElementNotSelectableException - It will be thrown when webdriver Is trying to select unselectable element.

5. ElementNotVisibleException - Thrown when webdriver Is not able to Interact with element which Is available In DOM but It Is hidden.

6. StaleElementReferenceException - VIEW DESCRIPTION.

100 : Tell me different ways to type text In text box In selenium test.

Answer : We can type text In text box of web page using bellow given ways In selenium test.

1.Using .SendKeys() method

driver.findElement(By.xpath("//input[@id='fname']")).sendKeys("Using sendKeys");

2. Using JavascriptExecutor

((JavascriptExecutor)driver).executeScript("document.getElementById('fname').value='Using JavascriptExecutor'");

3. Using Java Robot class VIEW EXAMPLE

driver.findElement(By.xpath("//input[@id='fname']")).click();

Robot robot = new Robot();

robot.keyPress(KeyEvent.VK_U);

robot.keyPress(KeyEvent.VK_S);

robot.keyPress(KeyEvent.VK_I);

robot.keyPress(KeyEvent.VK_N);

robot.keyPress(KeyEvent.VK_G);

robot.keyPress(KeyEvent.VK_SPACE);

robot.keyPress(KeyEvent.VK_R);

robot.keyPress(KeyEvent.VK_O);

robot.keyPress(KeyEvent.VK_B);

robot.keyPress(KeyEvent.VK_O);

robot.keyPress(KeyEvent.VK_T);

101 : Tell me different ways to verify element present or not on page.

Answer : We can check If element Is present or not using bellow given 2 simple ways.

1. Using .size() method

Boolean elePresent = driver.findElements( By.id("ID of element") ).size() != 0;

If above syntax return "false" means element Is not present on page and "true" means element Is present on page.

2. Using .isEmpty() method

Boolean elePresent = driver.findElements(By.id("ID of element")).isEmpty();

If this returns "true" means element Is not present on page and "false" means element Is present on page.

102 : Why we need to customize Firefox browser profile In webdriver test?

Answer : Webdriver launch fresh browser Instance when we run tests In Firefox browser using selenium webdriver. Fresh browser Instance do not have any Installed add-ons, saved passwords, bookmarks and any other user preferences. So we need to create custom profile of Firefox browser to get any of this thing In Webdriver launched browser.VIEW MORE DETAIL WITH EXAMPLE

Part 22

103 : How to customize Firefox browser profile for webdriver test?

Answer : You can do It In two different ways.

1. You can create your desired firefox browser profile before running test and then you can use It In your selenium webdriver test. VIEW EXAMPLE.

2. You can customize your firefox browser profile run time before launching webdriver's Firefox browser Instance. VIEW EXAMPLE.

104 : What is Difference between getAttribute() and getText()?

Answer :

· getAttribute() method Is useful to read element's attribute value like id, name, type etc. VIEW EXAMPLE.

· getText() method Is useful to read text from element or alert. VIEW EXAMPLE.

105 : What is the difference between WebDriver and Remote WebDriver?

Answer : Simple answer for this questions Is as bellow.

· WebDriver : Webdriver Is an Interface or we can say tool using which we can create automated test cases for web application and then run on different browsers like IE, Google chrome, Firefox etc.. We can create test cases In different languages. VIEW MORE DETAIL.

· Remote WebDriver : Remote WebDriver Is useful to run test cases In same machine or remote machines using selenium Grid.

106 : I have total 200 test cases. I wants to execute only 20 test cases out of them. Can I do It In selenium WebDriver? How?

Answer : Yes. If you are using TestNG with selenium webdriver then you can do Is using grouping approach as described In THIS PAGE. Create separate group for those 20 test cases and configure testng.xml file accordingly to run only those 20 test cases.

Also If you are using data driven framework then you can configure It In excel file. You can configure such data driven framework at your own by following steps given on THIS PAGE.

107 : Can you tell me three different ways to refresh page. Do not use .refresh() method.

Answer : We can refresh browser In many different ways. Three of them are as bellow.

driver.get(driver.getCurrentUrl());

driver.navigate().to(driver.getCurrentUrl());

driver.findElement(By.xpath("//h1[@class='title']")).sendKeys(Keys.F5);

Selenium Test Automation

Saturday, 18 April 2015

Selenium Webdriver interview Questions - 1

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