Selenium Interview Questions And Answers | Selenium Interview Questions | Selenium | Simplilearn

1 What are the Selenium suite components?

Selenium suite
Selenium IDE
It is a Firefox/Chrome plug-in that was
developed to speed up the creation of
automation scripts. It records the user actions
on the web browser and exports them as a
reusable script

Selenium suite
Selenium Remote Control (RC)
RC is a server that allows users to write application tests
in various programming languages. The commands from
the test script are accepted by this server and are sent to
the browser as Selenium core JavaScript commands.
The browser then behaves accordingly

Selenium suite
Selenium WebDriver
WebDriver is a programming interface that helps
create and run test cases. It makes provision to act
on web elements. Unlike RC, WebDriver does not
require an additional server and interacts natively
with the browser applications

Selenium suite
Selenium Grid
Grid was designed to distribute commands to different
machines simultaneously. It allows the parallel execution
of tests on different browsers and different operating
systems. It is exceptionally flexible and is integrated with
other suite components for simultaneous execution

2 What are the limitations of Selenium?

No reliable tech
support

No reliable tech
support
Tests only web
applications

No reliable tech
support
Limited support for
image testing
Tests only web
applications

What are the limitations of Selenium?
No reliable tech
support
Limited support for
image testing
No built in reporting
facility
2
Tests only web
applications

No reliable tech
support
Limited support for
image testing
Tests only web
applications
facility
Limited test
management
2

No reliable tech
support
Limited support for
image testing
facility
Limited test
management
May require knowledge of
programming languages
2
Tests only web
applications

3 What are the testing types supported by Selenium?

Selenium supports Regression testing and Functional testing

Regression testing
Re-testing
Prioritization of test cases
Regression test selection
Regression Testing is a full or partial selection of already executed test cases
which are re-executed to ensure existing functionalities work fine.
Steps involved are…

Regression testing
Re-testing
which are re-executed to ensure existing functionalities work fine.
• All tests in the
existing test suite
are executed
• Very expensive and
time consuming

which are re-executed to ensure existing functionalities work fine
Regression testing
Re-testing
Tests are classified as
• Feature tests
• Integration tests
• End to End tests
Some of these tests
are selected

which are re-executed to ensure existing functionalities work fine
Regression testing
Re-testing
The selected test cases
are prioritized based on
business impact and
critical functionalities

Functional Testing involves the verification of every function of the application with
the required specification.
Identify test input
Compute test outcome
Execute test
Compare the test outcome with the actual
outcome
Functional testing

4 What are Selenium 2.0 and Selenium 3.0?

4
Selenium 2.0 is a tool that makes the development of automated tests for web applications easier. It
represents the merger of the original Selenium project with the WebDriver project. Selenium RC got
deprecated since the merge, however was used for backward compatibility.
Selenium 2 Selenium IDE Selenium RC Grid
Selenium
WebDriver
What are Selenium 2.0 and Selenium 3.0?

4
Selenium 2.0 is a tool that makes the development of automated tests for web applications easier. It
represents the merger of the original Selenium project with the WebDriver project. Selenium RC got
deprecated since the merge, however was used for backward compatibility.
Selenium 2 Selenium IDE Selenium RC Grid
Selenium
WebDriver
Selenium 3 Selenium IDE
Selenium
WebDriver
Grid
Selenium 3.0 is the extended version of Selenium 2.0. It is inherently backward compatible and does not involve
Selenium RC. The new version came along with several bug fixes and increased stability.
What are Selenium 2.0 and Selenium 3.0?

5 What is Same Origin policy? How is it handled?

Same Origin policy is a feature adopted for security purposes. According to this policy, a web browser allows
scripts from one webpage to access the contents of another webpage provided both the pages have the same
origin

origin
Origin is a combination of URL
scheme, hostname and port
number.
Same Origin policy prevents a
malicious script on one page to
access sensitive data on another
webpage

origin
Consider a JavaScript program used by google.com. This test application can access all
Google domain pages like google.com/login, google.com/mail, etc.

origin
However, it cannot access pages from other domains like yahoo.com

Selenium RC was introduced to address this. The server acts as a client configured HTTP proxy and
"tricks" the browser into believing that Selenium Core and the web application being tested come from the
same origin.
RC server
origin
Test script

6 What is Selenese? How is it classified?

Selenese is the set of Selenium commands which are used to test your web application. Tester can test the broken
links, existence of some object on the UI, Ajax functionality, alerts, window, list options and lot more using
Selenese

Selenese is the set of Selenium commands which are used to test your web application. Tester can test the broken
links, existence of some object on the UI, Ajax functionality, alerts, window, list options and lot more using
Selenese
Action Accessors Assertions
Commands which interact
directly with the application
Allow the user to store
certain values to a
user-defined variable
Verifies the current state
of the application with an
expected state
Selenium commands

7 Mention the types of web locators.

Locator is a command that tells Selenium IDE which GUI elements ( say Text Box, Buttons, Check Boxes etc) it
needs to operate on. Locators specify the area of action

Locator by ID: It takes a parameter of String which is a Value of ID attribute and it returns the object to findElement()
method.
driver.findElement(By.id(“user”));
Locator by link: If your targeted element is link text then you can use by link text element locator to locate that
element
driver.findElement(By.linkText(“Today’s deals”)).click();
Locator by Partial link: The target link can be located using a portion of text in a link text element.
driver.findElement(By.linkText(“Service”)).click();
Locator by Name: The first element with the name attribute value matching the location will be returned
driver.findElement(By.name(“books”).click());

Locator by TagName: Locates all the elements with the matching tag name
driver.findElement(By.tagName(“button”).click());
Locator by classname: This finds elements based on the value of the CLASS attribute. If an element has many
classes then this will match against each of them.
driver.findElement(By.className(“inputtext”));
Locator by XPath: It takes a parameter of String which is a XPATHEXPRESSION and it returns an
object to findElement() method
driver.findElement(By.xpath(“//span[contains(text(),’an account’)]”)).getText();
Locator by CSS Selector: Locates elements based on the driver’s underlying CSS selector engine.
driver.findElement(By.cssSelector(“input#email”)).sendKeys(“myemail@email.com”);

8 What are the types of waits supported by WebDriver?

Explicit wait Fluent wait
Types of Wait
Implicit wait
Implicit wait basically tells Selenium to wait for a certain amount of time before throwing a “No such
element” exception.
driver.manage().timeouts().implicitlyWait(TimeOut, TimeUnit.SECONDS);

Implicit wait Fluent wait
Types of Wait
Explicit wait
Explicit wait is used to tell the Web Driver to wait for certain conditions before throwing
an "ElementNotVisibleException" exception.
WebDriverWait wait = new WebDriverWait(WebDriver Reference, TimeOut);

Implicit wait Explicit wait
Types of Wait
Fluent wait
Fluent wait is used to tell the web driver to wait for a condition, as well as the frequency with which we want to
check the condition before throwing an "ElementNotVisibleException" exception.
Wait wait = new FluentWait(WebDriver reference).withTimeout(timeout,
SECONDS).pollingEvery(timeout, SECONDS).ignoring(Exception.class);

9 Mention the types of navigation commands

driver.navigate().to("https://www.ebay.in/");
Navigates to the provided URL

driver.navigate().refresh();
This method Refresh the current page

driver.navigate().forward();
This method does the same operation
as clicking on the Forward Button of any browser. It
neither accepts nor returns anything

driver.navigate().back();
as clicking on the Back Button of any browser. It
driver.navigate().forward();
as clicking on the Forward Button of any browser. It

What is the major difference between driver.close() and
driver.quit()?10

driver.quit()?
driver.close()
This command closes the browser’s current window. If multiple windows are open, the
current window of focus will be closed
10

driver.quit()?
driver.close()
This command closes the browser’s current window. If multiple windows are open, the
current window of focus will be closed
driver.quit()
If quit() is called on the driver instance and there are one or more browser windows open,
it closes all the open browser windows
10

11 How to type text in an input box using Selenium?

How to type text in an input box using Selenium?
sendKeys() is the method used to type text in input boxes
11

Consider the following example
WebElement email = driver.findElement(By.id(“email”));
email.sendKeys(“abcd.efgh@gmail.com”);
WebElement password = driver.findElement(By.id(“Password”));
password.sendKeys(“abcdefgh123”);
Finds the “email” text
field using id locator
11

11
Enter text into the email
address field

Finds the “password” text
field using id locator
11

Enter text into the
password field
11

12 How to click on a hyperlink in Selenium?

The command finds the element using link text and then clicks on that element and thus the user
would be re-directed to the corresponding page

The command finds the element using link text and then clicks on that element and thus the user
would be re-directed to the corresponding page
driver.findElement(By.partialLinkText(“Service”)).click();
The above command finds the element based on the substring of the link provided in the parenthesis
and thus partialLinkText() finds the web element

13 How to scroll down a page using JavaScript?

13 How to scroll down a page using JavaScript?
scrollBy() method is used to scroll down the webpage
General syntax:
executeScript("window.scrollBy(x-pixels,y-pixels)");

13
First create a JavaScript object
JavascriptExecutor js = (JavascriptExecutor) driver;
General syntax:
How to scroll down a page using JavaScript?

13
Launch the desired application
driver.get(“https://www.amazon.com”);
General syntax:

13
Launch the desired application
driver.get(“https://www.amazon.com”);
Scroll down to the desired location
js.executeScript("window.scrollBy(0,1000)");
General syntax:
The window is scrolled vertically by 1000 pixels

14 How to assert the title of a webpage?

14 How to assert the title of a webpage?
Get the title of the webpage and store in a variable
String actualTitle = driver.getTitle();
Type in the expected title
String expectedTitle = “abcdefgh";
Verify if both of them are equal
if(actualTitle.equalsIgnoreCase(expectedTitle))
System.out.println("Title Matched");
else
System.out.println("Title didn't match");
Alternatively,
Assert.assertEquals(actualTitle, expectedTitle);

15 How to mouse hover over a web element?

Actions class utility is used to hover over a web element in Selenium
WebDriver

Actions class utility is used to hover over a web element in Selenium
WebDriver
Instantiate Actions class
Actions action = new Actions(driver);
In this scenario we hover over search box of a website
actions.moveToElement(driver.findElement(By.id("id of the searchbox"))).perform();

16 How to retrieve CSS properties of an element?

getCssValue() method is used to retrieve CSS properties of any web
element

getCssValue() method is used to retrieve CSS properties of any web
element
General Syntax:
driver.findElement(By.id(“id“)).getCssValue(“name of css attribute”);
Example:
driver.findElement(By.id(“email“)).getCssValue(“font-size”);

17 What is POM (Page Object Model)?

17 What is POM (Page Object Model)?
Page Object Model is a design pattern that helps create object repositories
for the web elements
Every webpage of the application has a corresponding page class that is responsible
for locating the web elements and performing actions on them
POM improves code re-usability and readability. Multiple test cases can be
run on the object repository

18 Can Captcha be automated?
Captcha is a security feature that prevents bots and automated programs
from accessing sensitive information
No, Selenium cannot automate Captcha
Automation test engineer has to manually type the captcha while other fields can be
filled automatically

19 How does Selenium handle Windows based pop-ups?

19 How does Selenium handle Windows based pop-ups?
Selenium was designed to handle web applications. Windows based features are not natively
supported by Selenium.
However, third party tools like AutoIT, Robot, etc can be integrated with Selenium to handle pop-
ups and other Windows based features

20 How to take screenshots in WebDriver?

20 How to take screenshots in WebDriver?
TakeScreenshot interface can be used to take screenshots in WebDriver.
getScreenshotAs() method can be used to save the screenshot
File scrFile = ((TakeScreenshot)driver).getScreenshotAs(outputType.FILE);

21 Can you type in a textbox without using sendKeys()?

Yes! Text can be entered into a textbox using JavaScriptExecutor

Yes! Text can be entered into a textbox using JavaScriptExecutor
JavascriptExecutor jse = (JavascriptExecutor) driver;
jse.executeScript("document.getElementById(‘email').value=“abc.efg@xyz.com”);

22 How to select a value from a dropdown in Selenium WebDriver?

Select class in WebDriver is used for selecting and deselecting options in a dropdown

The objects of Select type can be initialized by passing the dropdown webElement as parameter to
its constructor.
WebElement testDrop = driver.findElement(By.id("testingDropdown"));
Select dropdown = new Select(testDrop);

WebDriver offers three ways to select from a dropdown:
selectByIndex: Selection based on index starting from 0
dropdown.selectByIndex(5);
selectByValue: Selection based on value
dropdown.selectByValue(“Books”);
selectByVisibleText: Selection of option that displays text matching the given argument
dropdow,.selectByVisibleText(“The Alchemist”);

23 What does the switchTo() command do?

switchTo() command is used to switch between windows, frames or pop-ups within the
application. Every window instantiated by the WebDriver is given a unique alphanumeric value
called “Window Handle”

Get the window handle of the window you wish to switch to
String handle= driver.getWindowHandle();
Switch to the desired window
driver.switchTo().window(handle);
Alternatively
for(String handle= driver.getWindowHandles())
{ driver.switchTo().window(handle); }
switchTo() command is used to switch between windows, frames or pop-ups within the
application. Every window instantiated by the WebDriver is given a unique alphanumeric value
called “Window Handle”

24 How to upload a file in Selenium WebDriver?

Using sendkeys() or Robot class method, we could easily achieve this. Locate the text
box and set the file path using sendkeys() and click on submit button

Locate the browse button
WebElement browse =driver.findElement(By.id("uploadfile"));
Pass the path of the file to be uploaded using sendKeys method
browse.sendKeys("D:SeleniumInterviewUploadFile.txt");
Using sendkeys() or Robot class method, we could easily achieve this. Locate the text
box and set the file path using sendkeys() and click on submit button

25 How to set browser window size in WebDriver?

The window size can be maximized, set or resized

The window size can be maximized, set or resized
To maximize the window
driver.manage().window().maximize();
To set the window size
Dimension d = new Dimension(400,600);
driver.manage().window().setSize(d);
Alternatively,
Window size can be reset using JavaScriptExecutor
((JavascriptExecutor)driver).executeScript("window.resizeTo(1024, 768)");

26 When do we use findElement() and findElements()?

findElement() is used to access any single element on the web page. It returns the object of the
first matching element of the specified locator.
General syntax:
WebElement element = driver.findElement(By.id(example));

findElement() is used to access any single element on the web page. It returns the object of the
first matching element of the specified locator.
General syntax:
WebElement element = driver.findElement(By.id(example));
findElements() is used to find all the elements in the current web page matching to the specified
locator value. All the matching elements would be fetched and stored in the list of Web elements.
General syntax:
List <WebElement> elementList = driver.findElements(By.id(example));

27 What is pause on exception in Selenium IDE?

The user can use this feature to handle exceptions by clicking the pause icon on the top right corner
of the IDE

When the script finds an exception, it pauses at that particular statement and enters a debug mode. The
entire test case does not fail and hence the user can rectify the error immediately

28
How to login into any site if it is showing an Authentication Pop-Up for Username
and Password?

28
How to login into any site if it is showing an Authentication Pop-Up for Username
and Password?
Use the explicit wait command
WebDriverWait wait = new WebDriverWait(driver, 10);
Alert class is used to verify the alert
Alert alert = wait.until(ExpectedConditions.alertIsPresent());
Once verified, provide the credentials
alert.authenticateUsing(new UserAndPassword(<username>, <password>));
To handle authentication pop-ups, we first verify its appearance and then handle them using
explicit wait command

29 What is the difference between single and double slash in Xpath?

Single slash is used to create Xpath with absolute path i.e. the xpath
would be created to start selection from the start node.
/html/body/div[2]/div[1]/div[1]/a

Single slash is used to create Xpath with absolute path i.e. the xpath
would be created to start selection from the start node.
/html/body/div[2]/div[1]/div[1]/a
Double slash is used to create Xpath with relative path i.e. the xpath
would be created to start selection from anywhere within the document
//div[class="qa-logo"]/a

30 How do you find broken links in Selenium WebDriver?

When we use driver.get() method to navigate to a URL, it will respond with a status of 200-OK
200 – OK denotes that the link is working and it has been obtained. If any other status is obtained, then it is an
indication that the link is broken.
Some of the HTTP status codes are :
• 200 – valid Link
• 404 – Link Not Found
• 400 – Bad Request
• 401 – Unauthorized
• 500 – Internal error
We first obtain the links from the web application and individually get their status.

Navigate to the interested webpage for e.g. www.amazon.com
Collect all the links from the webpage. All the links are associated with the Tag ‘a‘
List<WebElement> links = driver.findElements(By.tagName("a"));
Create a list of type WebElement to store all the Link elements in to it.
for(int i=0; i<links.size(); i++) {
WebElement element = links.get(i);
String url=element.getAttribute("href");
verifyLink(url); }

Now Create a Connection using URL object( i.e ., link)
URL link = new URL(urlLink);
Connect using Connect Method
HttpURLConnection httpConn =(HttpURLConnection)link.openConnection();
Use getResponseCode () to get response code
if(httpConn.getResponseCode()!== 200)
Through exception if any error occurred
System.out.println(“Broken Link”);

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