What is Front End Testing? Frameworks & Tools

Software TestingAutomation TestingTesting Tools

What is Front End Testing, and what does it entail?

The Graphical User Interface (GUI), productivity, and accessibility of online applications or software are all assessed during front end testing. Front end testing's objective is to validate overall effectiveness to guarantee that the presentation tier of online applications or software remains defect-free across time.

For instance, digits must not be permitted on the frontend of the app when entering your name. Evaluating the orientation of GUI components is also another example.

Besides that, frontend testing is carried out for the following purposes −

  • Minor CSS modifications that disrupt the frontend design are subjected to regression testing.

  • Modifications to JS files that render the frontend inoperable

  • Performance Evaluations

We will cover in this lesson,

  • Front End Testing Types

  • What Is Frontend Testing and How Does It Work?

  • What Is The Best Way To Make A Frontend Website Testing Plan?

  • Why Make a Frontend Testing Strategy?

  • Frontend Testing Suggestions

  • Front-End Testing Instruments

  • Front-End Performance Enhancement

  • Performance Testing Tools for the Front End

  • What Is the Difference Between Front End and Back End Testing?

Front End Testing Types

Front end testing is a wide term that refers to a variety of testing methods. The most prevalent varieties are discussed in detail.

Unit Testing on the Front End

The bottom layer of the software testing process is front end unit testing. Individual components, such as input validations, computations, and other UI element activities, are generally tested to verify they work correctly.

Validating that the units perform as separate entities offers development teams confidence that they might operate as expected when integrated into bigger front-end functionalities. This allows the user to manage the development process more simple.

Visual Regression Analysis

The front end has its own set of visual regression testing. Visual regression testing, unlike many other kinds of tests that concentrate on the script, examines the interface of your program to the anticipated version in the staging or production environment.

This is done by analyzing many screenshots taken in a headless browser (one that runs on a server). The discrepancies between the snapshots are then detected using a testing tool that allows picture analysis.

Integrity Checking

Microservices are used to power the majority of current apps. If not well tested, the interaction between these services has the ability to degrade the customer experience. Integration testing guarantees that interaction between the user interface and the API of your application runs properly.

It elucidates the combined behavior of many system parts that are inextricably linked to one another.

What is the Best Way to Make a Frontend Website Testing Plan?

Developing a frontend testing strategy is a straightforward four-step procedure.

Step 1 − Look for tools to help you manage your test plan.

Step 2 − Establish a Front End Testing budget.

Step 3 − Establish a timetable for the full procedure.

Step 4 − Determine the project's overall vision. The following elements are included in the scope −

  • Users' operating systems and browsers Your audience's ISP plans

  • The audience's favorite gadgets

  • Your audience's level of expertise

  • The audience's quickness of rectification via the internet

Why Make a Frontend Testing Strategy?

A frontend testing strategy may assist you in determining

  • Browsers
  • Various Operating Systems

Your project must be comprehensive. You can test your front end on an infinite number of browsers and operating systems. Getting a strategy in place can reduce the amount of time and money when it comes to testing.

You will get the following benefits by developing a frontend testing plan −

  • It assists you in gaining total understanding on the project's scope.

  • Frontend testing also boosts trust in the project's deployment.

Frontend Testing Suggestions

Here are some crucial pointers to consider while creating a better frontend testing strategy −

  • Carefully plan your money, skills, and timeline.

  • Use a headless browser to speed up the testing process.

  • Reduce the amount of DOM rendering in tests to make them run faster.

  • Separate test cases so that the underlying cause of the fault may be identified quicker, resulting in a shorter fault repair cycle.

  • Use reused test scripts to speed up regression cycles.

  • Your test scripts should have a uniform naming convention.

Front-End Testing Instruments − A variety of important Frontend testing tools are utilized to undertake different types of functionality. Here are a few examples −

Tool for Cross-Browser Testing

  • LambdaTest (LambdaTest) − LambdaTest has become the most popular Cross Browser Testing platform, with over 100,000+ users in a year. Users may use its scalable, secure, and reliable cloud-based Selenium grid to execute automated web testing on a mix of 2000+ actual browsers and browser versions to optimize test coverage.

Tool for JS testing

  • Jasmine − It's a framework for testing JavaScript code that's based on behavior. The tool places a greater emphasis on the economic interest than on technical aspects. It features a simple syntax that makes writing tests a breeze. There are no other JavaScript frameworks that it is dependent on. Unit testing frameworks like JSSpec, ScrewUnit, JSpec, and RSpec have a big effect on it.

Tool for Functional Testing

  • Selenium − Selenium is a tool for front-end testing. It runs end-to-end tests on a variety of browsers and platforms, including Windows, Mac, and Linux. It enables you to develop tests in a variety of computer languages, including Java, PHP, C#, and others. The utility allows you to record and replay tests without having to understand Selenium IDE.

CSS-based Tool

  • The Needle − The needle is a CSS testing tool for front-end developers. It takes screenshots of certain parts of your website to ensure that visual components like as fonts, CSS, and photos appear properly. The application then compares the results to several well-known excellent screenshots. It also enables testers to compute CSS values and HTML element positions.

Any frontend testing tool must be aware of the following two key challenges −

  • At first, Test Automation necessitates a significant amount of work. As a result, it will take more time and effort.

  • Some Operating Systems and browsers may be incompatible with Test Tools.

Front-End Performance Enhancement

  • Checks for front-end performance "How quickly does the website load?"

  • Before testing an application with a large number of users, it's a good idea to optimize the front-end performance for a single user.

Importance of Front-End Performance Optimization

Previously, performance improvement meant focusing on the server. Because the majority of the websites were static and the majority of the processing was done on the server, this was the case.

Web applications, on the other hand, have grown more dynamic with the introduction of Web 2.0 technology. Client-side code has become a performance hog as a consequence.

Advantages of Optimizing Front-End Performance

  • Apart from server bottlenecks, detecting client-side performance problems is equally crucial in website testing since they have a direct influence on the user's experience.

  • Improving back-end performance by 50% will result in a 10% boost in total application performance.

  • However, increasing front-end performance by 50% will result in a 40% boost in total application performance.

  • Furthermore, compared to the backend, front-end speed tuning is simple and inexpensive.

Performance Testing Tools for the Front End

  • Page loading time − Google introduced Page Speed, an open source performance testing add-on. The program analyzes the web page and makes recommendations for reducing loading time. When consumers utilize the Google search engine to obtain online sites, it speeds up the retrieval process.

  • YSlow − YSlow is a web speed testing tool for the frontend. It examines all of the components on the page, including those built using JavaScript, to determine how well it performs. It also assesses the page's performance and makes recommendations to users.

Difference between Front End and Back End Testing

We already understand what front end testing entails from the previous part. Let's talk about back end testing next.

The database and server-side level of a three-tier structure make up an app's back end. In other terms, the back end is made up of the technology and business rules that make a front end program operate.

The application's user interface is not tested in back end testing (UI). It primarily verifies that the database has the correct data provided through the user interface. Back end testers also examine whether database queries provide the right data if any data is shown on the UI. Let's take a closer look at the differences between back end and front end testing.

Knowledge − Front end testers should be familiar with the customer's specifications. Not only will that, but a front end tester’s knowledge of automation frameworks aid them in their task. Back end testers, on the other hand, must be familiar with databases and SQL queries.

Things That Need to Be Tested − Front end testers should ensure that the app's user interface is error-free. They must also double-check every component, such as buttons, labels, and drop-down functionality. Back end testing necessitates the use of a database. GUI may or may not be used by testers. They must determine if data has been lost, corrupted, or is stuck in a stalemate.

Tools − Grunt, Karma, Mocha, and a slew of other front-end testing technologies are among the most useful. Turbo Data, Data Generator, and other API testing tools are popular back end testing tools.


  • Front-end Testing is the process of evaluating or confirming the frontend's functioning, graphical user interface, and usability.

  • Frontend testing's major goal is to ensure that every user is well-protected against problems.

  • Making a frontend testing strategy can help you figure out which devices, browsers, and operating systems your project will need to support.

  • It also aids you in gaining total insight on the project's scope.

  • Frontend testing tools include Jasmine, Selenium, Browser, TestComplete, and Needle, to name a few.

Published on 17-Dec-2021 11:49:12