- OOPS in Automation Framework

• ABSTRACTION
• INTERFACE
• INHERITANCE
• POLYMORPHISM
• METHOD OVERLOADING
• METHOD OVERRIDING
• ENCAPSULATION

ABSTRACTION
In Page Object Model design pattern, we write locators (such as id,
name, xpath etc.,) in a Page Class. We utilize these locators in tests
but we can’t see these locators in the tests. Literally we hide the
locators from the tests.

Abstraction is the methodology of hiding the implementation of

internal details and showing the functionality to the users.

Learn more on Abstraction

INTERFACE
Basic statement we all know in Selenium is WebDriver

driver = new FirefoxDriver();

WebDriver itself is an Interface. So what this means is that

WebDriver driver = new FirefoxDriver(); we are initializing Firefox
browser using Selenium WebDriver. It also means we are creating a
reference variable (driver) of the interface (WebDriver) and creating
an Object. Here WebDriver is an Interface as mentioned earlier and
FirefoxDriver is a class.
An interface in Java looks similar to a class but both the interface
and class are two different concepts. An interface can have methods
and variables just like the class but the methods declared in
interface are by default abstract.

Learn more on Interface here.

INHERITANCE
We create a Base Class in the Framework to initialize WebDriver
interface, WebDriver waits, Property files, Excels, etc., in the Base
Class.

We extend the Base Class in other classes such as Tests and Utility
Class. Extending one class into other class is known as Inheritance.

Learn more on Inheritance here.

POLYMORPHISM
The combination of overloading and overriding is known as Polymorphism.
Polymorphism allows us to perform a task in multiple ways.

Polymorphism is the ability of an object to take on many forms. The most

common use of polymorphism in OOP occurs when a parent class reference
is used to refer to a child class object.

- DYNAMIC POLYMORHISM - OVERRIDING

- STATIC POLYMORHISM - OVERLOADING

Learn more on Polymorphism here.

METHOD OVERLOADING
We use implicit wait in Selenium. Implicit wait is an example of
overloading. In Implicit wait we use different time stamps such as
SECONDS, MINUTES, HOURS etc.,

A class having multiple methods with same name but different

parameters is called Method Overloading

Learn more on Overloading here.

METHOD OVERRIDING
We use a method which was already implemented in another class
by changing its parameters.

Declaring a method in child class which is already present in the

parent class is called Method Overriding. Examples are get and
navigate methods of different drivers in Selenium.

Learn more on Overriding with examples here

ENCAPSULATION
All the classes in a framework are an example of Encapsulation. In
POM classes, we declare the data members using @FindBy and
initialization of data members will be done using Constructor to
utilize those in methods.

Encapsulation is a mechanism of binding code and data together in

a single unit.

Learn more on Encapsulation here

I would like to discuss some other topics which we use in
Automation Framework.

WEB ELEMENT:
Web element is an interface used to identify the elements in a web
page.

WEBDRIVER:
WebDriver is an interface used to launch different browsers such as
Firefox, Chrome, Internet Explorer, Safari etc.,

FIND BY:
FindBy is an annotation used in Page Object Model design pattern to
identify the elements.

FIND ELEMENT:
Find Element is a method in POM to identify the elements in a web
page.

Learn Java – A customized post for Selenium Automation Testers

 - How to handle browser (chrome) notifications in
Selenium?

- What is the use of @Listener annotation in TestNG?

TestNG listeners are used to configure reports and logging. One of

the most widely used listeners in TestNG is ITestListener interface.
It has methods like onTestStart,
onTestSuccess, onTestFailure, onTestSkipped etc.

Practical Example

- How to run a group of test cases using TestNG?

TestNG allows you to perform sophisticated groupings of test methods. Not

only can you declare that methods belong to groups, but you can also
specify groups that contain other groups. Then TestNG can be invoked and
asked to include a certain set of groups (or regular expressions) while
excluding another set.

Groups are specified in your testng.xml file and can be found either under
the <test> or <suite> tag. Groups specified in the <suite> tag apply to all
the <test> tags underneath.

View Complete Post

 - What is Parameterized testing in TestNG?

Parameterized tests allow developers to run the same test over and
over again using different values.

There are two ways to set these parameters:

• with testng.xml - Practical Example

• with Data Providers –

Practical Example

- How to set test case priority in TestNG?

We use priority attribute to the @Test annotations. In case priority

is not set then the test scripts execute in alphabetical order.

- How to create and run TestNG.xml?

In TestNG framework, we need to create TestNG XML file to create

and handle multiple test classes. We do configure our test run, set
test dependency, include or exclude any test, method, class or
package and set priority etc in the XML file.

For Complete Post

 - What is TestNG Assert and list out some
common Assertions supported by TestNG?

TestNG Asserts help us to verify the condition of the test in the

middle of the test run. Based on the TestNG Assertions, we will
consider a successful test only if it is completed the test run without
throwing any exception.

Some of the common assertions supported by TestNG are

• assertEqual(String actual,String expected)

• assertEqual(String actual,String expected, String message)
• assertEquals(boolean actual,boolean expected)
• assertTrue(condition)
• assertTrue(condition, message)
• assertFalse(condition)
• assertFalse(condition, message)

- What are the annotations available in TestNG?

@BeforeTest
@AfterTest
@BeforeClass
@AfterClass
@BeforeMethod
@AfterMethod
@BeforeSuite
@AfterSuite
@BeforeGroups
@AfterGroups
@Test

- How to delete Browser Cookies with Selenium Web

Driver?

- How to achieve Database testing in Selenium?

JDBC is a SQL level API that allows us to execute SQL statements.
It creates a connectivity between Java Programming Language and
the database.

Using JDBC Driver we can ..

i. Establish a Database connection

ii. Send SQL Queries to the Database
iii. Process the results

- What is Continuous Integration? CI

Continuous Integration is a development practice which aims to make sure

the correctness of a software. After each commit, a suite of tests run
automatically and test the software to ensure whether the software is
running without any breaks. If any test fails, we will get immediate feedback
say “build is broken” or “Build failed”

In simple words, continuous integration is a process of verifying the

correctness of a software.

We can schedule the test suite execution using these CI Tools.

What is desired capabilities?

In Selenium we use desired capabilities to handle SSL certificates in chrome

browser

We need to create an instance of DesiredCapabilities

 - How to Highlight Element Using Selenium WebDriver?

By using JavaScript Executor interface, we could highlight the

specified element

Practical Example

- How To Perform Drag And Drop Action in Selenium

WebDriver?

Selenium provides “Actions” class to handle drag and drop

Practical Example

- How To Perform Double Click Action In Selenium

WebDriver?
We use Actions class to do Double click action in selenium.

Practical Example

- How To Perform Right Click Action (Context Click) In

Selenium WebDriver?

We use Actions class in Selenium WebDriver to do Right-Click

(Context Click) action.

Practical Example
 - How To Scroll Web Page Down Or UP Using Selenium
WebDriver?

JavaScript scrollBy() method scrolls the document by the specified

number of pixels.

Practical Example

- How To Resize Browser Window Using Selenium

WebDriver?

To resize the browser window to particular dimensions, we use

‘Dimension’ class to resize the browser window.
 - How to switch between frames in Selenium?

By using the following code, we could switch between frames.

- How to Upload a file in Selenium WebDriver?

By Using send keys method

- How can you use the Recovery Scenario in Selenium

WebDriver?

By using “Try Catch Block” within Selenium WebDriver Java

tests.
 - What are the advantages of Page Object Model
Framework?

Code reusability – We could achieve code reusability by writing

the code once and use it in different tests.

Code maintainability – There is a clean separation between test

code and page specific code such as locators and layout which
becomes very easy to maintain code. It enhances test maintenance
and reduces code duplication.

Object Repository – Each page will be defined as a java class. All

the fields in the page will be defined in an interface as members.
The class will then implement the interface.

Readability – Improves readability due to clean separation

between test code and page specific code

- What is the difference between Page Object Model

(POM) and Page Factory?

Page Object is a class that represents a web page and hold the
functionality and members.

Page Factory is a way to initialize the web elements you want to

interact with within the page object when you create an instance of
it.

- What is Page Factory?

As you know ‘Page Object Model’ is a way of representing an

application in a test framework. For every ‘page’ in the application,
we create a Page Object to reference the ‘page’ in the other hand
‘Page Factory’ is one way of implementing the ‘Page Object Model’.
 - What is Page Object Model in Selenium? POM
Page object model (POM) can be used in any kind of framework
A page object is an object-oriented class that serves as an interface
to a page of your Application Under Test(AUT). The tests then use
the methods of this page object class whenever they need to
interact with the User Interface (UI) of that page. The benefit is that
if the UI changes for the page, the tests themselves don’t need to
change, only the code within the page object needs to change.

- How you build Object Repository in your project?

-
When a user records a test, the objects and its properties are
captured by default in an Object Repository. QTP uses this Object
Repository to play back the scripts. Coming to Selenium, there is no
default Object Repository concept. It doesn’t mean that there is no
Object Repository in Selenium. Even though there is no default one
still we could create our own. In Selenium, we call objects as
locators (such as ID, Name, Class Name, Tag Name, Link Text,
Partial Link Text, XPath, and CSS). Object repository is a collection
of objects. One of the ways to create Object Repository is to place
all the locators in a separate file (i.e., properties file). But the best
way is to use Page Object Model. In the Page Object Model Design
Pattern, each web page is represented as a class. All the objects
related to a particular page of a web application are stored in a
class.

- List some scenarios which we cannot automate using

Selenium WebDriver?

1. Bitmap comparison is not possible using Selenium

WebDriver(photos = Bitmap)
2. Automating Captcha is not possible using Selenium WebDriver
3. We can not read bar code using Selenium WebDriver

- How to handle Ajax calls in Selenium WebDriver?

AJAX sends HTTP requests from the client to server and then
process the server’s response without reloading the entire page.

When you click on a submit button, the required information may

appear on the web page without refreshing the browser. Sometimes
it may load in a second and sometimes it may take longer. We have
no control over loading time. The best approach to handle this kind
of situations in selenium is to use dynamic waits

1. titleIs() – The expected condition waits for a page with a

specific title.

1 wait. Until(ExpectedConditions.titleIs(“Deal of the Day”));

2. elementToBeClickable() – The expected condition waits for an

element to be clickable i.e. it should be present/displayed/visible on
the screen as well as enabled.

1 wait.until(ExpectedConditions.elementToBeClickable(By.xpath("xpath")));

3. alertIsPresent() – The expected condition waits for an alert box

to appear.

1 wait.until(ExpectedConditions.alertIsPresent()) !=null);

4. textToBePresentInElement() – The expected condition waits

for an element having a certain string pattern.

1 wait.until(ExpectedConditions.textToBePresentInElement(By.id(“title’”), “text to be found”));

- Is it possible to automate the captcha using Selenium?

No, It’s not possible to automate captcha and bar code reader.

- How do you read test data from excels?

To handle excel files we use Apache POI in Selenium WebDriver. As

we all know Selenium supports only Web browser automation. We
need to get the help of third party API like Apache POI to handle
(read and write) excel files using Selenium WebDriver.

List of JAVA INTERFACES AND CLASSES IN APACHE POI FOR READING XLS AND
XLSX FILE

- What is JavaScriptExecutor and in which cases

JavaScriptExecutor will help in Selenium automation?

Let me give you an example in general, we click on an element

using click () method in Selenium.

For example:

1 - driver. findElement(By.id("Id Value")).click();

Sometimes web controls don’t react well against selenium

commands and we may face issues with the above statement (click
()). To overcome such kind of situation, we
use JavaScriptExecutor interface.

Some scenarios we could handle using this Interface are :

1. To type Text in Selenium WebDriver without using send Keys() method
2. To click a Button in Selenium WebDriver using JavaScript
3. To handle Checkbox
4. To generate Alert Pop window in selenium
5. To refresh browser window using Javascript
6. To get innertext of the entire webpage in Selenium
7. To get the Title of our webpage
8. To get the domain
9. To get the URL of a webpage
10. To perform Scroll on an application using Selenium
11. To click on a SubMenu which is only visible on mouse hover on Menu
12. To navigate to different page using Javascript

- How to read a JavaScript variable in Selenium WebDriver?

By using JavascriptExecutor

- How to find more than one web element in the list?

- How to handle hidden elements in Selenium WebDriver?

We can handle hidden elements by using JavaScript Executor.

 - How can we handle windows-based pop up?

Selenium doesn’t support windows-based applications. It is an

automation testing tool which supports only web application testing.
We could handle windows-based popups in Selenium using some
third-party tools such as AutoIT, Robot class until now I have not
used those tools but I am looking forward to learning if needed.

- How can we handle web-based pop-up?

To handle alerts popups, we need to do switch to the alert window

and call Selenium WebDriver Alert API methods.

we use Alert Interface. The Alert Interface provides some methods

to handle the popups

We need to Import a package

org.openqa.selenium.Alert
to handle the alerts in Selenium.

driver.switchTo().alert();

To get a handle to the open alert:

1 Alert alert = driver.switchTo().alert();

To Click on OK button:

1 alert.accept();

To click on Cancel button.

1 alert.dismiss()

To get the text which is present on the Alert.

1 alert.getText();

To enter the text into the alert box

1 alert.sendkeys(String stringToSend);
To Authenticate by passing the credentials

1 alert.authenticateUsing(Credentials credentials)

Practical Example.

- How to mouse hover on a web element using

WebDriver?

By using Actions class

- How to capture Screenshot in Selenium WebDriver?

Selenium provides an interface called TakesScreenshot which has a
method getScreenShotAs which can be used to take a screenshot of
the application under test.

How to select a value in a dropdown?

By using Select class

Types of Select Methods:

i. selectByVisibleText Method
ii. selectByIndex Method
iii. selectByValue Method

Types of DeSelect Methods:

i. deselectByVisibleText Method
ii. deselectByIndex Method
iii. deselectByValue Method
iv. deselectAll Method

- How to find whether an element is displayed on the web

page?

In selenium WebDriver to verify if an element is displayed like

buttons, drop boxes, checkboxes, radio buttons, labels we use…

1. isDisplayed()

1 boolean elePresent = driver.findElement(By.xpath("xpath")).isDisplayed();

2. isSelected()

1 boolean eleSelected= driver.findElement(By.xpath("xpath")).isSelected();

3. isEnabled()

1 boolean eleEnabled= driver.findElement(By.xpath("xpath")).isEnabled();

 - What is the difference
between driver.findElement() and
driver.findElements() commands?

The difference between driver.findElement() and

driver.findElements() commands is-

• findElement() returns a single WebElement (found first) based on the

locator passed as parameter. Whereas findElements() returns a list of
WebElements, all satisfying the locator value passed.
• Syntax of findElement()-
WebElement textbox=driver.findElement(By.id(“textBoxLocator”));
Syntax of findElements()-
List <WebElement> elements = element.findElements(By.id(“value”));
• Another difference between the two is- if no element is found then
findElement () throws NoSuchElementException whereas
findElements() returns a list of 0 elements.

- What is the difference between driver.close() and

driver.Quit() methods?

Purpose of these two methods (driver.close and driver.quit) is

almost same. Both allow us to close a browser but still, there
is a difference.

driver.close(): To close current WebDriver instance

driver.quit(): To close all the opened WebDriver instances

- What is the difference between

driver.getWindowHandle() and
driver.getWindowHandles() in Selenium
WebDriver?

driver.getWindowHandle() – It returns a handle of the current

page (a unique identifier)
driver.getWindowHandles() – It returns a set of handles of the
all the pages available.

- What are the ways to refresh a browser using

Selenium WebDriver?

There are multiple ways to refresh a page in selenium

• Using driver.navigate().refresh() command as mentioned

in the question 45
• Using driver.get(“URL”) on the current URL or
using driver.getCurrentUrl()
• Using driver.navigate().to(“URL”) on the current URL
or driver.navigate().to(driver.getCurrentUrl());
• Using sendKeys(Keys.F5) on any textbox on the webpage

- Difference between Test Strategy and Test Plan

Test Plan Test Strategy

• A test plan for software • Test strategy is a set of

project can be defined as guidelines that explains
a document that defines test design and
the scope, objective, determines how testing
approach and emphasis needs to be done
on a software testing
effort
• Components of Test plan • Components of Test
include- Test plan id, strategy includes-
features to be tested, objectives and scope,
test techniques, testing documentation formats,
tasks, features pass or fail test processes, team
criteria, test deliverables, reporting structure,
responsibilities, and client communication
schedule, etc. strategy, etc.

• Test plan is carried out by • A test strategy is carried

a testing manager or lead out by the project
that describes how to manager. It says what
test, when to test, who type of technique to
will test and what to test follow and which
module to test

• Test plan narrates about • Test strategy narrates

the specification about the general
approaches

• Test plan can change • Test strategy cannot be

changed

• Test planning is done to • It is a long-term plan of

determine possible issues action.You can abstract
and dependencies in information that is not
order to identify the project specific and put
risks. it into test approach

• A test plan exists • In smaller project, test

individually strategy is often found
as a section of a test
plan
 • It is defined at project • It is set at organization
level level and can be used by
multiple projects

How can we maximize browser window in Selenium?

To maximize browser window in selenium we use maximize

() method. This method maximizes the current window if it is
not already maximized

driver.manage().window().maximize();

- How to fetch the current page URL in Selenium?

To fetch the current page URL, we use getCurrentURL()

- Can I navigate back and forth in a browser in

Selenium WebDriver?

We use Navigate interface to do navigate back and forth in a

browser. It has methods to move back, forward as well as to
refresh a page.

driver.navigate().forward(); – to navigate to the next web

page with reference to the browser’s history
driver.navigate().back(); – takes back to the previous
webpage with reference to the browser’s history
driver.navigate().refresh(); – to refresh the current web
page thereby reloading all the web elements
driver.navigate().to(“url”); – to launch a new web browser
window and navigate to the specified URL

- What is the difference

between driver.get() anddriver.navigate.to(“url”)?

driver.get(): To open an URL and it will wait till the whole

page gets loaded
driver.navigate.to(): To navigate to an URL and It will not
wait till the whole page gets loaded

- What is the alternative to driver.get()method to

open an URL using Selenium WebDriver?

Alternative method to driver.get(“url”) method

is driver.navigate.to(“url”)

- How to pause a test execution for 5 seconds at a

specific point?

By using java.lang.Thread.sleep(long milliseconds) method

we could pause the execution for a specific time. To pause 5
seconds, we need to pass parameter as 5000 (5 seconds)

- How to press ENTER key on text box In Selenium

WebDriver?

To press ENTER key using Selenium WebDriver, We need to

use Selenium Enum Keys with its constant ENTER.
 - How to submit a form using Selenium WebDriver?

We use “submit” method on element to submit a form

- How to click on a hyperlink using Selenium

WebDriver?

We use click() method in Selenium to click on the hyperlink

- How to get an attribute value using Selenium

WebDriver?

By using getAttribute(value);

It returns the value of the attribute passed as a parameter.

HTML:

1 <input name="nameSelenium" value="valueSelenium">SoftwareTestingMaterial</input>

Selenium Code:

1 String attributeValue = driver.findElement(By.name("nameSelenium")).getAttribute("value");

2 System.out.println("Available attribute value is :"+attributeValue);

3 Output: valueSelenium

- How to get a text of a web element?

By using getText() method

 - How to clear the text in the text box using
Selenium WebDriver?

By using clear() method

- How to input text in the text box without calling

the sendKeys()?

- How to input text in the text box using Selenium

WebDriver?

By using sendKeys() method

 - What is Fluent Wait In Selenium WebDriver?

In My experience FluentWait can define the maximum amount

of time to wait for a specific condition and frequency with
which to check the condition before throwing an
“ElementNotVisibleException” exception.

Syntax

Example

- What is WebDriver Wait In Selenium WebDriver?

WebDriverWait is applied on a certain element with

defined expected condition and time. This wait is only applied
to the specified element. This wait can also throw an
exception when an element is not found.

This are some Conditions that can be used in Explicit Wait

1. alertIsPresent()
2. elementSelectionStateToBe()
3. elementToBeClickable()
4. elementToBeSelected()
5. frameToBeAvaliableAndSwitchToIt()
6. invisibilityOfTheElementLocated()
7. invisibilityOfElementWithText()
8. presenceOfAllElementsLocatedBy()
9. presenceOfElementLocated()
10. textToBePresentInElement()
11. textToBePresentInElementLocated()
12. textToBePresentInElementValue()
13. titleIs()
14. titleContains()
15. visibilityOf()
16. visibilityOfAllElements()
17. visibilityOfAllElementsLocatedBy()
18. visibilityOfElementLocated()

Practical example
 - What is Implicit Wait In Selenium WebDriver?

Implicit waits tell to the WebDriver to wait for a certain

amount of time before it throws an exception. Once we set
the time, WebDriver will wait for the element based on the
time we set before it throws an exception. The default setting
is 0 (zero). We need to set some wait time to make
WebDriver to wait for the required time.

Practical example

- What are the types of waits available in Selenium

WebDriver?

In Selenium we could see three types of waits such as Implicit

Waits, Explicit Waits and Fluent Waits.

• Implicit Waits – Click to view detailed post

• Explicit Waits – Click to view detailed post
• Fluent Waits – Click to view detailed post
 - What are the different exceptions you have faced
in Selenium WebDriver?

Some of the exceptions I have faced in my current project are

1. ElementNotVisibleException
2. StaleElementReferenceException

Element Not visible Exception:

This exception will be thrown when you are trying to locate a

particular element on webpage that is not currently visible
even though it is present in the DOM. Also sometimes, if you
are trying to locate an element with the xpath which
associates with two or more element.

Stale Element Reference Exception:

A stale element reference exception is thrown in one of two

cases, the first being more common than the second.

The two reasons for Stale element reference are

1. The element has been deleted entirely.

2. The element is no longer attached to the DOM.

We face this stale element reference exception when the

element we are interacting is destroyed and then recreated
again. When this happens the reference of the element in the
DOM becomes stale. Hence we are not able to get the
reference to the element.

Some other exceptions we usually face are as follows:

• WebDriverException
• IllegalStateException
• TimeoutException
 • NoAlertPresentException
• NoSuchWindowException
• NoSuchElementException

- Explain the line of code Webdriver driver = new

FirefoxDriver(); ?

1 Webdriver driver = new FirefoxDriver();

‘WebDriver‘ is an interface and we are creating an object of

type WebDriver instantiating an object of FirefoxDriver class.

- What are the verification points available in

Selenium?

In Selenium WebDriver, there is no built-in features for

verification points. It totally depends on our coding style.
some of the Verification points are

• To check for page title

• To check for certain text
• To check for certain element (text box, button, drop
down, etc.)

- What are Soft Assert and Hard Assert in Selenium?

Soft Assert: Soft Assert collects errors during @Test Soft

Assert does not throw an exception when an assert fails and
would continue with the next step after the assert statement.

Hard Assert: Hard Assert throws

an AssertException immediately when an assert statement
fails and test suite continues with next @Test
 - What is the difference between Assert and Verify
in Selenium?

Assert: In simple words, if the assert condition is true then

the program control will execute the next test step but if the
condition is false, the execution will stop and further test step
will not be executed.

Verify: In simple words, there won’t be any halt in the test

execution even though the verify condition is true or false.

- What is the difference between Absolute Path and

Relative Path?

Absolute XPath starts from the root node and ends

with desired descendant element’s node. It starts with top
HTML node and ends with input node. It starts with a
single forward slash(/) as shown below.

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

Relative XPath starts from any node in between the HTML

page to the current element’s node(last node of the
element). It starts with a double forward slash(//) as shown
below.

1 //input[@id='email']

- What is the difference between “/” and “//”

Single Slash “/” – Single slash is used to create XPath with

absolute path i.e. the XPath would be created to start
selection from the document node/start node.

Double Slash “//” – 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.
 - What is an XPath?

XPath is used to locate the elements. Using XPath, we could

navigate through elements and attributes in an XML document
to locate web elements such as textbox, button, checkbox,
Image etc., in a web page.

- What are the Locators available in Selenium?

In Selenium WebDriver, there are 8 different types of

locators:

1. ID – Practical example
2. ClassName – Practical example
3. Name – Practical example
4. TagName – Practical example
5. LinkText – Practical example
6. PartialLinkText – Practical example
7. XPath – Practical example
8. CSS Selector – Practical example

Click here to see the detailed post on Locators.

- When do you use Selenium Grid?

Selenium Grid can be used to execute same or different test

scripts on multiple platforms and browsers concurrently so as
to achieve distributed test execution

- What are the advantages of Selenium Grid?

It allows running test cases in parallel thereby saving test

execution time.
It allows multi-browser testing
It allows us to execute test cases on multi-platform

- What is a hub in Selenium Grid?

A hub is a server or a central point that controls the test

executions on different machines.

- What is a node in Selenium Grid?

Node is the machine which is attached to the hub. There can

be multiple nodes in Selenium Grid.

-
-