Apache JMeter™ and the Selenium framework are two altered accoutrement with altered scopes in the avant-garde testing context. In this article, we will focus on the pros and cons of anniversary apparatus and actuate which of them is a key apparatus for which scenario. The appellation of this article seems to focus on a array of battle amid these tools, but instead, I will assay how these accoutrement can assignment together.
With the growing acceptance of testing and analysis automation in development projects, allotment the appropriate testing apparatus will access the absolute action and after-effects positively. Therefore, it’s not aberrant to apprehend testing tools’ assessments and draw comparisons amid them.
When annual apparatus comparisons you can draw accordant abstracts for your development process. For example:
This blog column will analyze JMeter and Selenium, and hopefully, you will adeptness the cessation that both can be advantageous for you, for altered use cases.
Both JMeter and Selenium are accoutrement that abridge the testing process. They are both
JMeter is an accessible antecedent amount and anatomic testing apparatus for assorted arrangement protocols, run as a Java desktop appliance with a graphical interface. Some of the accurate protocols are: JDBC database connections, FTP, LDAP, web services, websocket, JMS, HTTP, RTE, and all-encompassing TCP connections. JMeter is developed as a pluggable and adaptable apparatus apartment with JMeter plugins, which accredit avant-garde sampling and validation.
JMeter’s functionalities are organized in components. Anniversary basal belongs to a specific class that has a role and is acclimated hierarchically in the analysis script. JMeter scripts are developed in the anatomy of a apparatus timberline in the JMeter GUI (you can additionally use non-GUI access if you adopt scripting).
As you can see in the diagram below, the aforementioned blazon of aspect can accept altered scopes and can arise in altered places throughout the tree.
The JMeter apparatus fit into the JMeter GUI like this:
Selenium is an accessible antecedent anatomic testing framework that automates browsers. Selenium provides assorted accessories for web appliance testing beyond altered browsers and platforms. Selenium is not aloof a distinct apparatus but a apartment of software. The two best important genitalia of this apartment are Selenium WebDriver and Selenium IDE. The aboriginal one is a set of language-specific APIs for browser automation. The additional is a Firefox/Chrome addendum that provides a “record & replay” feature. Selenium scripts can additionally be recorded with the chargeless Chrome Extension.
Selenium scripts are mainly developed as code, to access best advantage of WebDriver’s API. This API has bindings on assorted programming languages. Anniversary web browser & operating arrangement brace crave a altered disciplinarian implementation. WebDriver is an absorption band that requires actual disciplinarian accession on the beheading machine.
The user can address in any of the accurate languages to Selenium WebDriver’s API, which automates any of the accurate drivers.
Now, let’s see aback we should use anniversary tool. Let’s attending at aback we accept the afterward academic web appliance architecture:
(This action is an oversimplification that takes into annual technologies and not implementations).
This appliance needs testing and validation. Let’s see which apparatus we should use in anniversary case.
Web Browser testing is a validation of how the web appliance is presented to a user on web browsers. These testing phases are commonly performed on added than one browser type, and accordingly can be additionally alleged cross-browser testing.
Web browser testing verifies:
Selenium is de facto the accepted for these types of tests.
Suppose that we accept afterward analysis requirement:
The smartest way to analysis this affection is Selenium. This is because we charge to accessible the web folio and adviser the browse cipher tag to ensure it has renewed the affectation code.
The cipher should aback a tag with the browse cipher and adviser it via a Selenium article alleged WebElement. This article periodically fetches a new browse cipher every 30 abnormal and compares it with antecedent one saved.
Even admitting WebSocket adeptness be encapsulated into a web affair and affect the browser, the user/Selenium will not apprehend it, so we will use JMeter for testing WebSockets.
Suppose that we accept the afterward analysis requirement:
The JMeter calligraphy will use one of JMeter’s elements: the Peter Doornbosch WebSocket Sampler. The consistent calligraphy performs the afterward steps:
This archetype describes absolutely an accessible agreement (that sends aback the bulletin unchanged), but it can be a starting point to a added circuitous scenario:
Modern web applications put a lot of accent on bearing a user interface that provides a acceptable user experience: it has to be visually ambrosial and bright abundant to back the bulletin in aloof a few seconds. For example, interacting with draggable apparatus that can be overlapped to access altered groupings (e.g. a barrow for e-commerce site).
Suppose we accept the afterward analysis requirement:
The smartest access to analysis this book is Selenium because this affection is accompanying to how apparatus are rendered on the browser. JMeter cannot advice because accomplishments accompanying to apprehension apparatus cannot be monitored.
Back-end systems consign business argumentation via the Web Service. The aforementioned back-end can accomplish this operation to assorted front-ends (e.g. Web and Mobile). This band is about an archetype of machine-to-machine interface, accordingly JMeter is absolute for this blazon of testing.
Suppose that we accept the afterward analysis requirement:
The JMeter calligraphy will simulate a user querying with a REST message. The calligraphy uses a accepted HTTP Sampler to accelerate a POST bulletin with a JSON payload.
The JMeter calligraphy can use JMeter’s arrangement affection with the afterward steps:
A tip aback developing REST analysis cases: aback defining affirmation accomplish but there is no absolute amount to assert, try appliance a acute approved expression, and bout a cord instead. In the archetype aloft I acclimated the afterward regex, which you too can use in your scripts:
Now that we’ve apparent in which cases you should use anniversary tool, let’s analyze JMeter and Selenium in two parameters:
The cardinal of developers alive on a analysis automation action can change, depending on the action akin of the project. Therefore, it’s important to accept how circuitous it is to apprentice to calligraphy in anniversary of these accoutrement and to advance their scripts. Of course, the added we automate, the beneath we charge to alternation people.
Selenium-based testing requires adeptness of WebDriver API. Moreover, it’s all-important to be accomplished in the called developing accent (e.g. Java, Python, C#, etc), developing a toolchain (e.g. Maven, Ant, MS Visual Studio, etc) and operating a testing framework (JUnit, TestNG, unittest, NUnit, etc). It’s accessible to accept a “Test Library” bore for simplifying the procedures, but that additionally requires training on. Selenium is additionally acceptable for BDD.
JMeter-based testing requires adeptness of the JMeter basal organization, or at atomic ten basal components. New developers charge be accomplished on ambiance bureaucracy and the appropriate plugins according to their analysis action goal. However, because JMeter has a GUI and doesn’t crave scripting, it’s easier to run and learn.
When autograph tests, analysis cases are not enough. Rather, developers and teams should accept a analysis apartment that aggregates analysis scripts to agreement analysis coverage. This is additionally accessible for analysis automation.
Automated analysis suites:
Not JMeter nor Selenium accept congenital analysis accession abilities. However, there are solutions:
The Selenium analysis apartment can be organized in a TestNG XML suite. As the name suggests, it’s an XML book that describes an absolute Selenium analysis suite/scenario to be executed. The consistent book can be accumulated amid analysis machines, acceding they accept the aforementioned analysis advantage logic. To access this it’s all-important to use TestNG as a testing framework and a Selenium analysis as a TestNG test. This is an accessible operation but it can become big-ticket if there is a ample cardinal of analysis cases to be migrated/adapted.
The JMeter analysis apartment is a accumulation of JMX scripts. A bigger way to accumulated these scripts is to use Taurus, which can handle them with YAML file. The JMX calligraphy files do not charge to be refactored and they are accessible to be aggregated into a YAML file. It’s accessible to adapt constant ethics anesthetized to anniversary JMX calligraphy in the suite. Moreover, it’s accessible to breach activities:
No. Selenium can be acclimated for some achievement testing (e.g. bound bandwidth testing), but it cannot be acclimated to amount analysis with accurateness like JMeter. For example, Selenium cannot accomplish a controlled cardinal of appeal for abnormal because it does accept an agnate of JMeter’s Connected Throughput Timer. Moreover, appliance a ambition appeal per additional in JMeter requires beneath assets from the beheading machine, because Selenium tries to instantiate abounding web browser processes.
Yes. There are assorted situations area both accoutrement can accompany on the aforementioned testing application. We will call some of them briefly.
The WebDriver Sampler plugin is a advertence plugin to add a Selenium analysis case in a JMeter script. It works with some limitations accompanying to ability consumption, but if there are alone a few iterations, it has acceptable applied trade-offs, including accessible configuration.
Another case could be active data-driven testing from JMeter on assorted Selenium WebDriver instances. Didn’t we say it was ability consuming? Yes, but with assertive requirements and accouterments it’s an accessible goal. Of course, it’s not so accessible and it requires developing to access a testing band amid JMeter and Selenium, to handle assorted instances bureaucracy and them circumstantial usage.
It’s additionally accessible to catechumen a Selenium analysis into a JMeter analysis appliance the Analysis Calligraphy Recorder. Practically speaking is appropriate to assassinate a Selenium analysis through a proxy and this proxy is the Analysis Calligraphy Recorder.
BlazeMeter additionally offers recording and creating a synced Selenium and JMeter script, which can be run in parallel. In addition, BlazeMeter has a new end-user acquaintance feature, which enables you to put in your URL and see what users see aback your armpit is beneath load.
Regardless of your role in analysis automation and development, both JMeter and Selenium are important and advantageous accoutrement to be acclimated during analysis action planning and execution. I achievement this blog column helps you accept the appropriate apparatus for you and your team, according to your action goals. You can additionally accommodate and accompany these tools, with accessible antecedent frameworks like Taurus. So alpha testing now!
To get the chargeless recorder that annal and creates JMeter and Selenium scripts, bang here.
To apprentice about Taurus, bang here.
To get a BlazeMeter demo, bang here.
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