Gatling api testing tutorial

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By default, recorder works on port, but this is configurable. If a web application is being tested then the browser should be configured to work through the Gatling Recorder proxy. If network traffic that is going to be recorded is not browser-based, e. This configuration forces applications network traffic to go through a configured proxy. The same configuration is done in order to configure a proxy for Chrome, Opera and Internet Explorer browsers.

It is designed to bring security in normal HTTP communication. This security is guaranteed with the server being issues certificate issued by a certification authority.

Gatling is intercepting the traffic between server and client browser hence is considered intruder into safe HTTPS communications. There are several mechanisms provided by the recorder to handle this.

Beware: in normal daily internet browsing such warning is a sign that something is wrong, your HTTPS connection might be sniffed, so be careful what data you provide in such cases. Some sites are configured in a manner that if the certificate is invalid you are unable to proceed.

Here is how Firefox react in both cases. For both valid certificate should be issued for the domain under test.

Generating and handling SSL certificates could be a painful process. This can easily be done with Chrome DevTools plugin that is activated with F12 keyboard key. Once traffic is being recorded and exported it then gets converted to Gatling simulation by Gatling Recorder. In order to exclude not important requests, e. Once started is looks default simulations folder and gives a list of all simulations.

The user selects simulation by number in the list and then gives a short description for this run.

Quickstart

Simulations can be changed before running in order to configure a different number of users as it is 1 by default. If simulations are recorded in different that default folder then runner cannot find them. Gatling recorder is powerful and provides various ways to record a scenario. Automation Rhapsody Automate with enthusiasm.

Performance testing with Gatling — record and playback Last Updated on Post summary: How to record a simulation with Gatling recorder and play it back. Configure system proxy If network traffic that is going to be recorded is not browser-based, e.

Conclusion Gatling recorder is powerful and provides various ways to record a scenario.I had an opportunity to use Gatling for load testing in one of my recent projects. My learning curve for this tool was very steep and I found it very elegant, highly capable and easy to use. Gatling is an open-source load testing framework based on ScalaAkka and Netty. More details here. The Scala class contains following parts. It is defined as a Scala variable so that it can be passed later in the simulation definition.

Gatling allows you to use common headers at HTTP protocol level as mentioned in step 1 comment 4 above. You can also make use of the build in headers to pass to individual requests. We will see in subsequent steps on how they can be used in the requests. See here. Hi Performance Engineer, is Gatling suitable for performance testing reactjs sites.

Like Like. Gatling works at the HTTP protocol level. Did you try TruClient protocol in loadrunner? It can be used to measure the performance of client-side rendering of the contents. So what you can do is — Configure a test scenario having two types test scripts. TrueClient protocol script to measure client-side performance. Another way is to capture single use traffic with tools like HTTPWatch while the load test is running.

You can Sikuli and automate the browser side interactions. I have Experience in Load runner meter. I need some Help from you. I am new to the Gatling tool and having very less knowledge in Performance testing. This is a quick tutorial on how to use Gatling for API testing. You are commenting using your WordPress.

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Session API

Notify me of new posts via email. The selection of the URL is random. Using inGatling will automatically parse HTML to find embedded resources and load them asynchronously. Use this to disable the feature OR use your own warm-up URL instead of default one Gatling can run multiple concurrent connections per virtual user when fetching resources on the same host.

The default value is 6. Use this parameter to use the built-in value for chrome browser. There are many other built-in values for different browser types, see here Request stats are logged and then used to produce reports. So we silence them by using this. OR use this. To avoid infinite redirection loops Used to disable caching.In this post, we will see how to use Gatling with Maven, creating an integration via plugins.

First, we will create a new Maven project and add the dependencies. We will be able to incorporate Gatling into an existing project whether the performance tests are going to exist in the same project as other tests, or on their own or in a project starting from scratch. If we want to employ Gatling for a Maven project that was started from scratch and made specifically to use Gatling tests and nothing else, it would be useful to build it starting from an archetype Maven project templatefollowing the steps in this post.

In Maven, plugins are responsible for executing tasks, such as to compile projects, run tests, and create. Generally, they provide the project with a series of commands that can be executed utilizing the following syntax:. Later we will see how we can utilize some of these commands. By adding these lines to our pom. These will permit us to build and execute our project, including the generation of reports. Here is an example of a project running Maven and Gatling, with some prepared simulations on a testing environment.

This project was developed starting from the archetype mentioned above. I preferred the second. In order for IntelliJ to work, we must install the Scala plugin, although when a scala file is opened, an install link appears automatically. There are various ways to identify the URLs that we wish to use in our simulations, as well as the data needed for their configuration.

In the copy of the results, we can find all of the data that will facilitate a correct configuration of the URLs in the script of our simulation.

gatling api testing tutorial

Now we will use Maven to run our script. For this we will open a terminal and locate the root address of our project and execute the following command:. Maven will recognize this as a command thanks to the Gatling plugin that we added to the pom. This project will also include two other commands that can be used, which are:. By the end of the execution of our script, Gatling will have generated some excellent reports for us to analyze.

Now you can start to integrate your scripts using the Maven building tool! This will also facilitate the execution of these scripts with Continuous Integration tools such as Jenkins. Gatling vs. Save my name, email, and website in this browser for the next time I comment. Leave this field empty. Agile TestingPerformance Engineering 0.

Preparing a Project with Maven First, we will create a new Maven project and add the dependencies. Generally, they provide the project with a series of commands that can be executed utilizing the following syntax: Later we will see how we can utilize some of these commands. The pom. How to Prepare a Simple Test There are various ways to identify the URLs that we wish to use in our simulations, as well as the data needed for their configuration.

In the copy of the results, we can find all of the data that will facilitate a correct configuration of the URLs in the script of our simulation Execution of Gatling with Maven Now we will use Maven to run our script. For this we will open a terminal and locate the root address of our project and execute the following command: Maven will recognize this as a command thanks to the Gatling plugin that we added to the pom.

This project will also include two other commands that can be used, which are: During the execution we can see the console output: Results By the end of the execution of our script, Gatling will have generated some excellent reports for us to analyze.

Have any questions? Leave us a comment! Recommended for You Gatling vs.This is first of series of posts designed to give a complete overview of Gatling performance testing tool. Other posts in the series are:. Performance testing is a way to identify how an application behaves in case of high user load.

Current post is about how to do it with Gatling. Gatling is a very powerful tool. Akka has message-driven architecture and this overrides the JVM limitation of handling many threads.

Virtual users are not threads but messages. Tests are written in Scala, which makes scenarios creation and maintenance more complex. For easy scenario creation, Gatling provides very good recorder.

It works as a proxy capturing all traffic and converting it into Gatling scenario. Once a simulation is recorded it can be changed with proper values, user count, etc and run. Simulation class. The scenario is the actual user execution path. There are other elements like Feeders that create input data and Checks that are used to validate responses. Everything in Scala is an object, there are no primitive data types like int, long, char, etc in Java.

Gatling provides a Gatling Maven plugin. Simulation can be recorded with the recorder and further processed as a Maven project. It is capable of creating an immense amount of traffic from a single node. It requires basic knowledge in Scala which is his main disadvantage. Java code can be directly used in Scala classes.

Advance usage is from a Maven project which makes it more easy to use and maintain scenarios. Automation Rhapsody Automate with enthusiasm.

Performance testing with Gatling Last Updated on Post summary: Tutorial how to use Gatling and do successful performance testing with it.Otherwise, you might end up not testing your application but your caches.

Though, you have to make your scenario steps dynamic, based on virtual user specific data. In Gatling, entries in this map are called Session attributes.

A Session is actually the message that are passed along a scenario workflow. Session instances are immutable! Why is that so? Because Sessions are messages that are dealt with in a multi-threaded concurrent way, so immutability is the best way to deal with state without relying on synchronization and blocking.

A very common pitfall is to forget that set and setAll actually return new instances. Trying to get a [String] actually performs a toString conversion and thus, always works as long as the entry is defined. If the value is a [String]Gatling will try to parse it into a value of the expected type.

Using as will probably be easier for most users. It will work fine, but the downside is that they might generate lots of expensive exceptions once things starts going wrong under load.

We advise considering validate once accustomed to functional logic as it deals with unexpected results in a more efficient manner. Note Remember that a Gatling scenario is a workflow where every step is backed by an Akka Actor?

Load Testing Using Gatling – Gatling Simulation from Scratch (Part 1 of 4)

Note Trying to get a [String] actually performs a toString conversion and thus, always works as long as the entry is defined.

Note If the value is a [String]Gatling will try to parse it into a value of the expected type. Note Using as will probably be easier for most users.Alok is a Software Engineer with a keen interest in Web and Enterprise software architecture, design, implementation and delivery Alok also is an avid cook and expresses his creativity everyday through the medium of food. He wishes this was a food blog but ends up talking technology all the time! We guess this is why he calls this blog "TechieCook's Nook" Alok started programming in the early s, while in the 8th grade, building Inventory Control applications in BASIC and selling them to a few clients.

S as well as a Master of Science M. S in Computer Science with a keen focus on Distributed and Parallel computational algorithms.

gatling api testing tutorial

Since years Alok has worked within various businesses to apply his technical and problem-solving skills into solving complex Enterprise Software Development and Integration problems. These include integrating with legacy mainframe systems to modern web applications, transforming traditional point-to-point integration into reusable services with Service Oriented Architecture SOAdeveloping partner relationships through effective B2B integrations, building monolithic applications and containerised microservices and building Web APIs for desktop and mobile clients.

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Open Source Load & Performance Testing Tool - How to Use Gatling - Part 1

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Load testing is an important practice for APIs and applications that have lots of users. For load testing their APIs, developers can choose between many popular open source load testing tools. One of these is Gatling. Both Gatling and JMeter are very powerful load testing tools.

gatling api testing tutorial

But one of the advantages Gatling offers Java developers is the Scala development language for test creation, which is nicer to use in my opinion.

Read a more comprehensive comparison of open source performance testing tools here. If you want to practice yourself, you can find the complete source with all the configs and codes this blog post cover, here.

This article will show code fragments. Don't forget to install Gatling. Let's get started. As mentioned before, Gatling uses Scala for test configuration. Therefore, we have to add plugin support to build. Run the following command:. Next, we need to add a task for Gradle, so that we can execute our load tests from the command line.

To do that, add the following code to the build. This is the default way for creating custom tasks for Gradle. It is a JavaExec type task, with test class dependencies. This means it has nothing to do with main classes. The most important part here is the configuration, where we let Gatling know which simulation basically that's a test to execute, where to store reports, and where to get body files body files are for requests that require having a body.

That's all the basic configuration we have to do for executing a Gatling test. Now let's create the actual test simulation. You can change this to your own API config and the number of requests, i. Compared to JMeter, Gatling has an advantage in reporting. After each execution, you can see the path to the latest generated report in the command line. In my case, it is the following part of the command line output:.

And when I point my browser to that path I can see the report shown in the pictures below. In the reports we have lots of useful information, the most useful part is on the first page directly where we can see request countpassed requests count OKand failed request count KO.

This is the minimum that we need, but for our API improvements, we can take a deeper look into the details. For example, in case of errors we will have this:. See the original article here. Performance Zone. Over a million developers have joined DZone. Let's be friends:. DZone 's Guide to. Read on for more information! Free Resource.


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