Selenium interview questions

Selenium Interview Questions

Selenium Interview Questions, Java Selenium Interview Questions 2012
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1. What is Selenium?
2. What are the main components of Selenium testing tools?
3. What is Selenium IDE?
4. What is the use of context menu in Selenium IDE?
5. Can tests recorded using Selenium IDE be run in other browsers?
6. What are the advantage and features of Selenium IDE?
7. What are the disadvantage of Selenium IDE tool?
8. What is Selenium RC (Remote Control)?
9. What is Selenium Grid?
10. How Selenium Grid works?
11. What you say about the flexibility of Selenium test suite?
12. What test can Selenium do?
13. What is the cost of Selenium test suite?
14. What browsers are supported by Selenium Remote Control?
15. What programming languages can you use in Selenium RC?
16. What are the advantages and disadvantages of using Selenium as testing tool?
17. What is difference between QTP and Selenium?
18. What do you know about Selenium?
19. What are the technical challenges with selenium?
20. What are the test types supported by Selenium?
21. What are the capabilities of Selenium IDE?
22. What are the challenges with Selenium IDE?
23. Which are the browsers supported by Selenium IDE?
24. How to execute a single line command from Selenium IDE?
25. How to insert a start point in Selenium IDE?
26. How to insert a comment in Selenium IDE?
27. How to insert a break point in Selenium IDE?
28. How to debug the tests in Selenium IDE?
29. How to export the tests from Selenium IDE to Selenium RC in different languages?

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30. How to capture bitmaps in Selenium?
31. Which is the command used for displaying the values of a variable into the output
console or log?
32. Which are the browsers supported by Selenium RC?
33. Which are the Operating Systems supported by Selenium?
34. What is Selenium RC?
35. Why Selenium RC is used?
36. Which are the languages supported by Selenium RC?
37. When to use Accessors in Selenium?
38. What is Selenium WebDriver or Google WebDriver or Selenium 2.0?
39. What are the capabilities of Selenium WebDriver or Google WebDriver or Selenium
2.0?
40. What is the architecture of Selenium RC?
41. What is the architecture of Selenium Grid?
42. Does Selenium support mobile internet testing?
43. Does Selenium support Google Android Operating System?
44. What are the types of text patterns available in Selenium?
45. How to use regular expressions in Selenium?
46. What is Selenese?
47. How do you add check points or verification points in Selenium?
48. What is Assertion in Selenium?
49. What is an Accessor in Selenium?
50. When to use Assert, Verify and WaitFor in Selenium?

How to capture bitmaps in Selenium? | Selenium
28 May 2012 0 comments

Bitmaps are captured using the Selenium set of commands. There are two modes of
capturing the bitmaps
1) Capture the bitmap for the entire page - it captures the browser main page area of AUT
2) Capture the bitmap for the screen shots - it captures the entire screen shot like the print



screen that you give from your keyboard
Selenium doesn't support bitmap capturing for an element on AUT.
Read More!

When to use Accessors in Selenium? | Selenium
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Accessors are mostly used for storing the value in a variable.
The variable can be used for following reasons:
1) To get the value from an element and comparing with some dynamic value
2) To take a logical decision to execute the test steps
ex: if the value of the variable true execute step1 and step2 else step3 and step4
3) To execute some statements in a loop based on the value returned by the element.
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When to use Assert, Verify and WaitFor in Selenium? | Selenium
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1) assert - If the expected value is mandatory to continue with the next set of steps we will
use Assert. As Assert aborts the test, if the expected value doesn't match. It is good to use
for any mandatory checks.
2) verify - If the expected value is optional to continue with the next set of steps we will use
Verify. As Verify continues executing with the next set of steps, if the expected value
doesn't match. It is good to use for any optional checks.
3) waitFor - If your test needs to wait, if the expected value is not matching we use waitFor.
We normally use waitFor for AJAX kind of controls loading within a page.
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What are the types of Assertions there in Selenium? | Selenium
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Selenium Assertions can be used in 3 modes:
1) assert - When an “assert” fails, the test will be aborted. If you are executing test suite,
the next state case will start
2) verify - When a “verify” fails, the test will continue execution, logging the failure.



3) waitFor - “waitFor” commands wait for some condition to become true (which can be
useful for testing Ajax applications). They will succeed immediately if the condition is
already true. However, they will fail and halt the test if the condition does not become true
within the current timeout setting.
Read More!

What is Assertion in Selenium? | Selenium
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Assertion is nothing but a check or verification point.
Assertion verifies the state of the application conforms to what is expected.
Examples include “make sure the page title is X” and “verify that this checkbox is checked.
Read More!

What is Selenese? | Selenium
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Selenium set of commands which are used for running the test are called as Selenese.
There are three types of Selenese, those are:
1. Actions - used for performing the operations and interactions with the target elements
2. Assertions - used as check points
3. Accessors - used for storing the values in a variable.
Read More!

How to use regular expressions in Selenium? | Selenium
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Regular expressions in Selenium IDE can be used with the keyword - regexp: as a prefix to
the value and patterns needs to be included for the expected values.
For example if you want to use the regular expression for a command
Command: verifyText
Target: //font/font/b/font[1]
Value: Flight Confirmation # 2011-05-02451
in the above example Flight Confirmation is continuously changing each time you run the
test case. So this can be written with a regular expression as mentioned below



Command: verifyText
Target: //font/font/b/font[1]
Value: regexp:Flight Confirmation # [0-9]{4}-[0-9]{2}-[0-9]{5,10}.
Read More!

What are the types of text patterns available in Selenium? | Selenium
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There are three types of patterns available in Selenium:
1. globbing
2. regular expressions
3. exact.
Read More!

Does Selenium support Google Android Operating System? | Selenium
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Yes, Selenium Web Driver or Google Web Driver or Selenium 2.0 supports Android
Operating System. There are several libraries written to support Android Operating System.
Read More!

Does Selenium support mobile internet testing? | Selenium
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Selenium supports Opera. And opera is used in most of the Smart phones. So whichever
Smart phone supports opera, selenium can be used to test. So, one can use Selenium RC to
run the tests on mobiles.
Read More!

What is the architecture of Selenium Grid? | Selenium
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The below mentioned theory explains about the setup of Selenium Grid with architecture
and how it works.
Selenium Grid builds on the traditional Selenium setup, taking advantage of the following
properties:
* The Selenium test, the application under test, and the remote control/browser pair do not



have to be co-located. They communicate through HTTP, so they can all live on different
machines.
* The Selenium tests and the web application under test are obviously specific to a
particular project. Nevertheless, neither the Selenium remote control nor the browser is
tied to a specific application. As a matter of fact, they provide a capacity that can easily be
shared by multiple applications and multiple projects.
Consequently, if only we could build a distributed grid of Selenium Remote Controls, we
could easily share it across builds, applications, projects - even potentially across
organizations. Of course we would also need to address the scalability issues as described
earlier when covering the traditional Selenium setup. This is why we need a component in
charge of:
* Allocating a Selenium Remote Control to a specific test (transparently)
* Limiting the number of concurrent test runs on each Remote Control
* Shielding the tests from the actual grid infrastructure
Selenium Grid calls this component the Selenium Hub.
* The Hub exposes an external interface that is exactly the same as the one of a traditional
Remote Control. This means that a test suite can transparently target a regular Remote
Control or a Selenium Hub with no code change. It just needs to target a different IP
address. This is important as it shields the tests from the grid infrastructure (which you can
scale transparently). This also makes the developer’s life easier. The same test can be run
locally on a developer machine, or run on a heavy duty distributed grid as part of a build –
without ever changing a line of code.
* The Hub allocates Selenium Remote Controls to each test. The Hub is also in charge of
routing the Selenese requests from the tests to the appropriate Remote Control as well as
keeping track of testing sessions.
* When a new test starts, the Hub puts its first request on hold if there is no available
Remote Control in the grid providing the appropriate capabilities. As soon as a suitable
Remote Control becomes available, the Hub will serve the request. For the whole time, the
tests do not have to be aware of what is happening within the grid; it is just waiting for an
HTTP response to come back.



Read More!

What is the architecture of Selenium RC? | Selenium
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The Selenium Server which launches and kills browsers, and acts as an HTTP proxy for
browser requests.
Client libraries for various programming languages, each of which instructs the Selenium
Server in how to test the AUT by passing it your test script’s Selenium commands.
The diagram shows the client libraries communicate with the Server passing each Selenium
command for execution. Then the server passes the Selenium command to the browser
using Selenium-Core JavaScript commands. The browser, using its JavaScript interpreter,
executes the Selenium command, which effectively, runs the check you specified in your
Selenese test script.
Read More!

What are the capabilities of Selenium WebDriver or Google WebDriver or
Selenium 2.0? | Selenium
0 comments

One should use WebDriver when requiring improved support for
• Mult-browser testing including improved functionality for browsers not well-supported by
Selenium-1.0.
• Handling multiple frames, multiple browser windows, popups, and alerts.
• Page navigation.
• Drag-and-drop.
• AJAX-based UI elements.
Read More!

What is Selenium WebDriver or Google WebDriver or Selenium 2.0? |
Selenium
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WebDriver uses a different underlying framework from Selenium’s javascript Selenium-
Core. It also provides an alternative API with functionality not supported in Selenium-RC.



WebDriver does not depend on a javascript core embedded within the browser, therefore it
is able to avoid some long-running Selenium limitations.
WebDriver’s goal is to provide an API that establishes
• A well-designed standard programming interface for web-app testing.
• Improved consistency between browsers.
• Additional functionality addressing testing problems not well-supported in Selenium 1.0.
The Selenium developers strive to continuously improve Selenium. Integrating WebDriver is
another step in that process. The developers of Selenium and of WebDriver felt they could
make significant gains for the Open Source test automation community be combining forces
and merging their ideas and technologies. Integrating WebDriver into Selenium is the
current result of those efforts.
Read More!

Which are the languages supported by Selenium RC? | Selenium
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The languages supported by Selenium RC
1. .Net,
2. Java (Junt 3, Junt 4, TestNG, Groovy)
3. Perl,
4. Python,
5. PHP,
6. Ruby.
Read More!

Why Selenium RC is used? | Selenium
0 comments

Selenium-IDE does not directly support:
1. condition statements
2. iteration
3. logging and reporting of test results
4. error handling, particularly unexpected errors
5. database testing



6. test case grouping
7. re-execution of failed tests
8. test case dependency
9. capture screenshots on test failures
The reason behind why Selenium-IDE does not support the above mentioned requirements
is IDE supports only HTML language. Using HTML language we cannot achieve the above
mentioned requirements. Because HTML does not support conditional, looping and
external source connectives.
To overcome the above mentioned problems Selenium RC is used.
Since Selenium RC supports the languages .Net, Java, Perl, Python, PHP, and Ruby. In these
languages we can write the programme to achieve the IDE issues
Read More!

What is Selenium RC? | Selenium
0 comments

Selenium-RC is the solution for tests that need a little more than just simple browser
actions and a linear execution. Selenium-RC leverages the full power of programming
languages, creating tests that can do things like read and write external files, make queries
to a database, send emails with test reports, and practically anything else a user can do with
a normal application.
You will want to use Selenium-RC whenever your test requires logic not supported by
running a script from Selenium-IDE
Read More!

Which are the Operating Systems supported by Selenium? | Selenium
0 comments

Selenium IDE
Works in Firefox 2+ Start browser, run tests Run tests
Operating Systems Supported:
1. Windows,
2. OS X
3. Linux



4. Solaris
5. Others whichever supports Firefox 2+
Selenium Remote Control
Used for starting browser and run tests
1. Windows,
2. OS X
3. Linux
4. Solaris
5. Others
Selenium Core
Used for running tests
1. Windows,
2. OS X
3. Linux
4. Solaris
5. Others
Read More!

Which are the browsers supported by Selenium RC? | Selenium
0 comments

Supported browsers for Selenium RC include:
1. *firefox
2. *mock
3. *firefoxproxy
4. *pifirefox
5. *chrome
6. *iexploreproxy
7. *iexplore
8. *firefox3
9. *safariproxy


10. *googlechrome
11. *konqueror
12. *firefox2
13. *safari
14. *piiexplore
15. *firefoxchrome
16. *opera
17. *iehta
18. *custom
Note: Any third party browser is supported with *custom followed by the complete path of
the browser with executable
Read More!

Which is the command used for displaying the values of a variable into the
output console or log? | Selenium
0 comments

The command used for displaying the values of a variable into the output console or log -
echo
If you want to display a constant string. The below mentioned command can be used
echo <constant string>
ex: echo "The sample message"
If you want to display the value of a variable it can be written like below
echo ${<variable name>>
ex: echo ${var1}
Note: Here var1 is the variable.
Read More!

How to export the tests from Selenium IDE to Selenium RC in different
languages? | Selenium
0 comments

From selenium IDE the test cases can be exported into the languages:
1. .Net,



2. Java,
3. Perl,
4. Python,
5. PHP,
6. Ruby
The below mentioned steps can explain how to export the test cases:
1. Open the test case from Selenium IDE
2. Select File -> Export Test Case As
Read More!

How to debug the tests in Selenium IDE? | Selenium
0 comments

To debug or execute the test cases line by line. Follow the below mentioned steps
1. Insert a break point (see the question to know more How to insert a break point in
Selenium IDE? )from the location where you want to execute step by step
2. Run the test case
3. execution will be paused at the given break point
4. Click on the step (Blue) button to continue with the next statement
5. Click on Run button, to continue executing all the commands at a time.
Read More!

How to insert a break point in Selenium IDE? | Selenium
0 comments

Break point can be set in two ways in Selenium IDE:
1. Right click on the command in Selenium IDE and select "Toggle Break Point"
2. Select the command in Selenium IDE and press "B" key on the keyboard
3. If you want to clear the break point once again Spress "B" key on the keyboard
4. You can set multiple break points in Selenium IDE.
Read More!

How to insert a comment in Selenium IDE? | Selenium
0 comments


Comments in Selenium IDE can be set in two ways
1. Right click on the command in Selenium IDE and select "Inert New Comment"
2. If you want to comment an existing line. You need to follow the below mentioned steps.
a. Select the source tab in IDE
b. Select the line which you want to comment
c. Assume that if you want to comment a open command you need to write like below
mentioned code
<tr>

</tr>
Read More!

How to insert a start point in Selenium IDE? | Selenium
0 comments

Start point Selenium IDE can be set in two ways:
1. Right click on the command in Selenium IDE and select "Set / Clear Start Point"
2. Select the command in Selenium IDE and press "S" key on the keyboard
3. You can have only one start point
4. If you have already set one start point and you selected other command as start point.
Then the first start point will be removed and the new start point will be set.
Read More!

How to execute a single line command from Selenium IDE? Selenium
0 comments

Single line command from Selenium IDE can be executed in two ways
1. Right click on the command in Selenium IDE and select "Execute This Command"
2. Select the command in Selenium IDE and press "X" key on the keyboard.
Read More!


Which are the browsers supported by Selenium IDE? | Selenium
0 comments

Selenium IDE supports only one browser Mozilla Firefox.
The versions supported as of now are:
Mozilla Firefox 2.x
Mozilla Firefox 3.x
The versions not supported as of now are:
earlier versions of Mozilla Firefox 2.x
Mozilla Firefox 4.x.
Read More!

What are the challenges with Selenium IDE? | Selenium
0 comments

Selenium-IDE does not directly support:
1. condition statements
2. iteration or looping
3. logging and reporting of test results
4. error handling, particularly unexpected errors
5. database testing
6. test case grouping
7. re-execution of failed tests
8. test case dependency
9. capture screenshots on test failures
10. Results Report generations.
Read More!

What are the capabilities of Selenium IDE? | Selenium
0 comments

Selenium IDE (Integrated Development Environment) works similar to commercial tools like
QTP, Silk Test and Test Partner etc.
The below mentioned points describes well about Selenium IDE.
1. Selenium IDE is a Firefox add-on.



2. Selenium IDE can support recording the clicks, typing, and other actions to make a test
cases.
3. Using Selenium IDE A Tester can play back the test cases in the Firefox browser
4. Selenium IDE supports exporting the test cases and suites to Selenium RC.
5. Debugging of the test cases with step-by-step can be done
6. breakpoint insertion is possible
7. Page abstraction functionality is supported by Selenium IDE
8. Selenium IDE can supports an extensibility capability allowing the use of add-ons or user
extensions that expand the functionality of Selenium IDE.
Read More!

What are the test types supported by Selenium? | Selenium
0 comments

Selenium could be used for testing the web based applications. The test types can be
supported are:
1. functional,
2. regression,
3. load testing
The automation tool could be implemented for post release validation with continuous
integration tools like:
1. Jenkins,
2. Hudson,
3. QuickBuild
4. CruiseCont
Read More!

What are the technical challenges with selenium? | Selenium
0 comments

As you know Selenium is a free ware open source testing tool. There are many challenges
with Selenium.
1. Selenium Supports only web based applications
2. It doesn’t support any non web based (Like Win 32, Java Applet, Java Swing, .Net Client



Server etc) applications
3. When you compare selenium with QTP, Silk Test, Test Partner and RFT, there are many
challenges in terms of maintainability of the test cases
4. Since Selenium is a freeware tool, there is no direct support if one is in trouble with the
support of applications
5. There is no object repository concept in Selenium, so maintainability of the objects is very
high
6. There are many challenges if one have to interact with Win 32 windows even when you
are working with Web based applications
7. Bitmap comparison is not supported by Selenium
8. Any reporting related capabilities, you need to depend on third party tools
9. You need to learn any one of the native language like (.Net, Java, Perl, Python, PHP, Ruby)
to work efficiently with the scripting side of selenium.
Read More!

What do you know about Selenium? | selenium
0 comments

Selenium is a suite of tools for web automation testing.
Selenium first came to life in 2004 when Jason Huggins was testing an internal application
at ThoughtWorks.
Selenium was a tremendous tool, it wasn’t without it’s drawbacks. Because of its Javascript
based automation engine and the security limitations browsers apply to Javascript, different
things became impossible to do.
Selenium Suite of projects include:
Selenium IDE
Selenium Core
Selenium 1 (known as. Selenium RC or Remote Control)
Selenium 2 (known as. Selenium Webdriver)
Selenium-Grid.
Read More!

What is difference between QTP and Selenium? | Selenium



0 comments

Only web applications can be testing using Selenium testing suite. However, QTP can be
used for testing client server applications. Selenium supports following web browsers:
Internet Explorer, Firefox, Safari, Opera or Konqueror on Windows, Mac OS X and Linux.
However, QTP is limited to Internet Explorer on Windows.

QTP uses scripting language implemented on top of VB Script. However, Selenium test suite
has the flexibility to use many languages like Java, .Net, Perl, PHP, Python, and Ruby.
Read More!

What are the advantages and disadvantages of using Selenium as testing tool?
| Selenium
0 comments

Advantages: Free, Simple and powerful DOM (document object model) level testing, can
be used for continuous integration; great fit with Agile projects.
Disadvantages: Tricky setup; dreary errors diagnosis; can not test client server applications.
Read More!

What programming languages can you use in Selenium RC? | Selenium
0 comments

C#, Java, Perl, PHP, Python, Ruby.
Read More!

What browsers are supported by Selenium Remote Control? | selenium
0 comments

The test automation expert can use Firefox, IE 7/8, Safari and Opera browsers to run tests in
Selenium Remote Control.

Read More!

What is the cost of Selenium test suite? selenium
0 comments



Selenium test suite a set of open source software tool, it is free of cost.
Read More!

What test can Selenium do? | Selenium
0 comments

Selenium is basically used for the functional testing of web based applications. It can be
used for testing in the continuous integration environment. It is also useful for agile testing
Read More!

What you say about the flexibility of Selenium test suite? | Selenium
0 comments

Selenium testing suite is highly flexible. There are multiple ways to add functionality to
Selenium framework to customize test automation. As compared to other test automation
tools, it is Selenium’s strongest characteristic. Selenium Remote Control support for
multiple programming and scripting languages allows the test automation engineer to build
any logic they need into their automated testing and to use a preferred programming or
scripting language of one’s choice. Also, the Selenium testing suite is an open source project
where code can be modified and enhancements can be submitted for contribution.
Read More!

How Selenium Grid works? | Selenium
0 comments

Selenium Grid sent the tests to the hub. Then tests are redirected to an available Selenium
RC, which launch the browser and run the test. Thus, it allows for running tests in parallel
with the entire test suite.
Read More!

What is Selenium Grid? | Selenium
0 comments

Selenium Grid in the selenium testing suit allows the Selenium RC solution to scale for test
suites that must be run in multiple environments. Selenium Grid can be used to run
multiple instances of Selenium RC on various operating system and browser configurations.
Read More!


What is Selenium RC (Remote Control)? | Selenium
0 comments

Selenium RC allows the test automation expert to use a programming language for
maximum flexibility and extensibility in developing test logic. For example, if the application
under test returns a result set and the automated test program needs to run tests on each
element in the result set, the iteration / loop support of programming language’s can be
used to iterate through the result set, calling Selenium commands to run tests on each
item. Selenium RC provides an API and library for each of its supported languages. This
ability to use Selenium RC with a high level programming language to develop test cases
also allows the automated testing to be integrated with the project’s automated build
environment.
Read More!

What are the disadvantage of Selenium IDE tool? | Selenium
0 comments

1. Selenium IDE tool can only be used in Mozilla Firefox browser.
2. It is not playing multiple windows when we record it.

Read More!

What are the advantage and features of Selenium IDE? | Selenium
0 comments

1. Intelligent field selection will use IDs, names, or XPath as needed
2. It is a record & playback tool and the script format can be written in various languages
including : C#, Java, PERL, Python, PHP, HTML
3. Auto complete for all common Selenium commands
4. Debug and set breakpoints
5. Option to automatically assert the title of every page
6. Support for Selenium user-extensions.js file.
Read More!

Can tests recorded using Selenium IDE be run in other browsers? | Selenium
0 comments



Yes. Although Selenium IDE is a Firefox add on, however, tests created in it can also be run
in other browsers by using Selenium RC (Selenium Remote Control) and specifying the
name of the test suite in command line.
Read More!

What is the use of context menu in Selenium IDE? | Selenium
0 comments

It allows the user to pick from a list of assertions and verifications for the selected location.
Read More!

What is Selenium IDE? | Selenium
0 comments

Selenium IDE is for building Selenium test cases. It operates as a Mozilla Firefox add on and
provides an easy to use interface for developing and running individual test cases or entire
test suites. Selenium-IDE has a recording feature, which will keep account of user actions as
they are performed and store them as a reusable script to play back.
Read More!

What are the main components of Selenium testing tools? | Selenium
0 comments

Selenium IDE, Selenium RC and Selenium Grid.
Read More!

What is Selenium? | Selenium
0 comments

Selenium is a set of tools that supports rapid development of test automation scripts for
web based applications. Selenium testing tools provides a rich set of testing functions
specifically designed to fulfil needs of testing of a web based application.



http://java-success.blogspot.in/2011/10/jmeter-interview-questions-and-answers.html

Q. What are some of the challenges you faced with JMeter?
If a subsequent request rely on the cookie set by the previous request, the "cookie
manager" element is required.

When setting up the "CSV Data Set Config", don't have any spaces in the variable names.

What are Pre-Processor and Post-Processor elements? In what order does JMeter process
various type of elements?
A Pre-Processor executes some action prior to a Sampler Request being made. If a Pre-
Processor is attached to a Sampler element, then it will execute just prior to that sampler



element running. A Pre-Processor is most often used to modify the settings of a Sample
Request just before it runs, or to update variables that aren't extracted from response text.

A Post-Processor executes some action after a Sampler Request has been made. If a Post-
Processor is attached to a Sampler element, then it will execute just after that sampler
element runs. A Post-Processor is most often used to process the response data, often to
extract values from it.

A Regular Expression Extractor can be used as a Post-Processor element to extract values to
be used elsewhere in subsequent requests. For example, if you are using JSF and Seam
frameworks, the jsfViewState and CID values can be extracted as shown below:



The elements are executed in the following order as per the JMeter documentation.

0. Configuration elements
1. Pre-Processors
2. Timers
3. Sampler
4. Post-Processors (unless SampleResult is null)
5. Assertions (unless SampleResult is null)
6. Listeners (unless SampleResult is null)

Timers, Assertions, Pre- and Post-Processors are only processed if there is a sampler to
which they apply. Logic Controllers and Samplers are processed in the order in which they
appear in the tree. Other test elements are processed according to the scope in which they
are found, and the type of test element.

Q. How do you ensure re-usability in your JMeter scripts?
Using config elements like "CSV Data Set Config", "User Defined Variables", etc for greater
data reuse.
Modularizing shared tasks and invoking them via a "Module Controller".
Writing your own BeanShell functions, and reusing them.


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Selenium interview questions