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JMeter Cookbook

By : Erinle

3.6 (8)

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.

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. JMeter Fundamentals

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. 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. 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. 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. 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. 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. 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. 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

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

Index

Index

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Using timers

By default, when test scripts are recorded in JMeter, they contain no pauses between page requests. This is sometimes known as the think time in test scripts. In reality though, most users will frequently pause for a duration of time on every page before moving on to another page in the application. In JMeter, the ways to achieve these pauses are through timers. JMeter comes with a wealth of timers to achieve this purpose.

How to do it…

In this recipe, we will show you how to mimic realistic user behaviors using the JMeter timers.

Launch JMeter.
Open the ch1_add_timers.jmx test script located in the scripts/ch1 directory.
Add Gaussian Random Timer by navigating to Test plan | Add | Gaussian Random Timer.
Change Deviation (in milliseconds) from 100 to 1000.
Change Constant Delay Offset (in milliseconds) from 300 to 500.
Save and execute the test script.

How it works…

With our configuration, each thread will pause for a duration of 0.5 to 1.5 seconds after each request before proceeding to the next request. This is because we applied the timer at the root level of the test plan. If we wanted to have pauses after each logical page rendering, we will add a timer at the transaction controller level. This option is mostly what you will go with as a single rendered web page often consists of multiple requests.

There's more…

There are many more timers that come bundled with JMeter even through additional plugins that serve different purposes. There are timers that simulate constant delay, constant throughput, random delay, and so much more. Depending on your use case and what you are trying to simulate, you will choose one or several of these.

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