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JMeter Cookbook

JMeter Cookbook

By : Erinle
3.6 (8)
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JMeter Cookbook

JMeter Cookbook

3.6 (8)
By: Erinle

Overview of this book

This book is great for you if you are a developer, quality assurance engineer, tester, or test manager who is looking to get a firmer grasp of elementary, deep, and advanced testing concepts using Apache JMeter. It’s assumed you have access to a computer and an Internet connection. No prior testing or programming experience is required, but would be helpful.
Table of Contents (11 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. JMeter Fundamentals
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1. JMeter Fundamentals
Introduction
Executing a test script
Recording a script via HTTP(S) Test Script Recorder
Recording scripts via the Chrome browser extension
Converting HTTP web archives (HAR) to JMeter test plans
Viewing and analyzing test results
Feeding data into a script
Using timers
Managing HTTP user sessions
Testing Single Page Applications (SPAs)
Testing AJAX-centric applications
2
2. Handling Responses
2. Handling Responses
Introduction
Using Regular Expression Extractor
Using Regular Expression Tester
Using CSS/jQuery Extractor
Using XPath Extractor
Dealing with file downloads
Handling XML responses
Handling JSON responses
Handling HTML responses
Using Response Assertion
Using Duration Assertion
Uploading files with your scripts
3
3. Building Robust Test Plans with Controllers
3. Building Robust Test Plans with Controllers
Introduction
Using Transaction Controller in test plans
Using Loop Controller in test plans
Leveraging ForEach Controller in test plans
Using Interleave and Random Controller in test plans
Using Runtime Controller in test plans
4
4. Testing Services
4. Testing Services
Introduction
Testing REST web services
Testing SOAP web services
Testing FTP services
Testing relational databases
Testing NoSQL databases
Testing JMS services
5
5. Diving into Distributed Testing
5. Diving into Distributed Testing
Introduction
Testing applications with JMeter's master-slave setup
Testing internal applications using JMeter and Vagrant
Testing external facing applications using JMeter, Vagrant, and AWS
Testing external facing applications using Flood.IO
Testing external facing applications using BlazeMeter
6
6. Extending JMeter
6. Extending JMeter
Introduction
Using REST Sampler
Using Ultimate Thread Group
Using Throughput Shaping Timer
Using Console Status Logger
Using Dummy Sampler
Developing custom JMeter plugins
Testing WebSocket-enabled applications
7
7. Building, Debugging, and Analyzing the Results of Test Plans
7. Building, Debugging, and Analyzing the Results of Test Plans
Introduction
Using the View Results Tree listener
Using the Aggregate Report listener
Debugging with Debug Sampler
Using Constant Throughput Timer
Using the JSR223 postprocessor
Analyzing Response Times Over Time
Analyzing transactions per second
Using User Defined Variables (UDV)
8
8. Beyond the Basics
8. Beyond the Basics
Introduction
Continuous Integration with JMeter
Testing with different bandwidths
Using the HTTP Cache Manager component
Using script languages within test plans
Writing Test scripts through Ruby DSL
Understanding JMeter properties
Monitoring servers while executing tests (using VisualVM)
Monitoring servers while executing tests (using YourKit Profiler)
Monitoring servers while executing tests (using New Relic)
Performance tips to scale JMeter
9
A. Installing the Supporting Software Needed for this Book
A. Installing the Supporting Software Needed for this Book
Introduction
Installing JMeter
Installing Java Development Kit (JDK)
Installing JMeter plugins
Installing Vagrant
Installing VirtualBox
Installing Maven
Installing Git
Obtaining AWS keys for EC2
10
Index
Index

Managing HTTP user sessions

Most websites have a means of authenticating users, thereby enabling them to gain access to protected data or content that only pertains to them. Also, it is very common for websites to give users different roles based on what the user will be doing. For instance, a user called Joe could be given admin privileges while Susan is only given user privileges. Whatever the case, JMeter has a way to maintain HTTP user sessions for your test scripts.

How to do it…

In this recipe, we will detail how to accomplish this with JMeter. Perform the following steps:

  1. Launch JMeter.
  2. Open the add_cookie_manager.jmx test script.
  3. Run the test plan.
  4. Notice the failed requests, even though the log in request succeeded:
    • The Request immediately option following the log in request is indicative of this. The Request tab shows no cookies were sent with the request. Refer to the following code:
      	GET http://evening-citadel-2263.herokuapp.com/
	 [no cookies]
	Request Headers:
	Connection: keep-alive
	Host: evening-citadel-2263.herokuapp.com
	User-Agent: Apache-HttpClient/4.2.6 (java 1.5)
    • Furthermore, our response assertions fail, as subsequent requests were not associated with the existing user, but were treated as new requests.
  5. Clear the results (Mac OS: Command + Shift + E and Windows: Ctrl + Shift + E).
  6. Add HTTP Cookie Manager to the test plan by navigating to Test plan | Add | Config Element | HTTP Cookie Manager.
  7. Save and run the test plan.
  8. Observe the results in the View Results in Tree listener and notice how all the requests now succeed:
    • If you observe the request immediately following the log in request, you will notice that the cookie information is correctly sent with the request, thanks to the added HTTP Cookie Manager. You should see something similar to this:
      	GET http://evening-citadel-2263.herokuapp.com/
	Cookie Data:		     	connect.sid=s%3AWN5ITZxWEKyzmmAB5sct7PjA.6UAJ36%2F9%2BWFQPjdzA%2B7%2B1NL4%2Bf0HzC %2BOQI%2Bol0V0eJ0
	Request Headers:
	Connection: keep-alive
	Host: evening-citadel-2263.herokuapp.com
	User-Agent: Apache-HttpClient/4.2.6 (java 1.5)

How it works…

The HTTP Cookie Manager stores and sends cookies like a web browser does. The cookie of any request that contains one is automatically extracted and stored by the component to be used for all future requests from that particular thread. Each JMeter thread gets its own session just like in a regular web browser to prevent users' sessions from overlapping with each other.

There's more…

Apart from the automatically extracted cookies by the HTTP Cookie Manager component, JMeter provides a way to add user-defined cookie values to a test plan. Unlike their automatically extracted counter parts, once defined, all threads executing in the test plan will share these values.

End of Section 10
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