This guest article on Applozic Blog was written by Parth Bari. Parth is a web developer with expertise in Frontend technologies. He shares his knowledge by writing blog posts, giving tech talks at conferences and mentoring people on web development. You can find Nikhil on his LinkedInFacebook and Instagram.

Parth Bari
Parth Bari

When creating interactive user interactions, web applications are a popular choice for organizations that don’t want to develop a full-fledged mobile app. From Netflix to Spotify and even Gmail, several examples of web applications are changing how we leverage web-based services. However, these web applications may not offer the interactive performance you may be looking for without proper testing. 

When creating interactive user interactions, web applications are a popular choice for organizations that don’t want to develop a full-fledged mobile app. From Netflix to Spotify and even Gmail, several examples of web applications are changing how we leverage web-based services. However, these web applications may not offer the interactive performance you may be looking for without proper testing. 

Creating web app tests is not an easy task as you need to counter several challenges like cross-browser compatibility, native environments of operating systems, and security issues. For example, cyber-attacks on web applications saw a massive growth of 800% in 2020. 

You will find the need to  test your web applications for security purposes to ensure there are no data breaches. Here we will discuss web app testing, its types, and how to create efficient tests for your projects. 

What is Web App Testing? 

Web application testing is a practice to ensure that the quality and functionality of the app are at par with the expectations. It is also essential to understand the performance issues and rectify them before you release the web app. Not just before the launch, testing is an ongoing process that will allow you to find bugs and improve the performance of every version. 

Testing is quintessential for software development and allows you to make quick changes in the code and rectify bugs. You can either hire testers or choose a web app development company with a comprehensive testing suite included with their services. In addition, however, there are specific testing services that you can leverage and even customize according to your business needs. 

Now, if you are looking to create a web app testing plan for your organization/application, prior knowledge regarding the types, pre-requisites, and other such aspects of web testing is necessary. So, let’s move on to a checklist that will give you an effective outline for successful web app testing.

Web App Testing Checklist

Source: Free Photo | Notebook with to do list on desk with cup of coffee beside (

Web application testing needs elaborate planning to counter several aspects from resource requirements, infrastructure, testers, and automation. So, in order to know what are the prerequisites and resources needed, you will need an assessment of the application.

#1. Pre-testing Assessments

Web applications need compatibility across browsers which is one of the essential parts of your testing plans. Further, you also need to assess the current security measures employed for the web applications; this will help you gauge what type of security tests you need. 

For example, there are vulnerability scanners and penetration tests. Vulnerability scanners will help you scan the system and identify loopholes in the security measures. At the same time, a penetration test exploits vulnerabilities to test the extent to which security measures work. 

Take an example of the file uploads. If you are developing a web application for a ride-hailing business, you need to provide a feature for document uploads. Now, if your website is not secure, there are chances of a data breach which can be catastrophic. 

The next important thing is to decide which type of testing you will need. Each type of test has different requirements for resources and testing codes. 

#2. Types of tests

There are several types of web app testing based on functionality, usability, and other parameters. Let’s discuss them in detail.

Functionality Testing 

Functionality testing solely focuses on the output. Each test provides a measure of how features and functions of web applications respond to user requests. It allows you to check on your web application performance concerning the specifications. Here, you need to check for different metrics that involve, 

  • Check for links and whether they take the user to the designed page or not.
  • Click on the link and check whether it opens to an empty page.
  • Check if all the links are clickable or not.
  • Make sure the input fields of web forms are responsive
  • Also, check on optional and mandatory fields
  • Check if the input values auto-populate on-page reload
  • Do forms have better readability?
  • Check for syntax errors and stylesheet issues

Usability Testing

Usability testing relates to the user-friendly attribute of your web applications. However, there are many other aspects of usability testing that you need to focus which includes, 

  • Check if the navigation of the website is easy to use
  • The style and look of the menus, links, and buttons must be uniform across the website.
  • Content should be readable, and images need to have “Alt tags.”
  • Check if the features are responsive and easily accessible

Interface Testing

While testing the interface, you must ensure that the data is retrieved correctly from the database layer and shown on the presentation layer with each user request. For this, you need to test the interface, web server, and database to check for responsiveness to user requests. 

This is essential when more than 60% of customers in the digital market are mobile users. Your goal here is to test your interface for better responsiveness and mobile-friendly attributes. You also need to measure other parameters which involve: 

  • Whether the site remains responsive if plugins are removed?
  • Do the files on the web apps offer access on multiple platforms
  • Is there a failsafe in place in case of a download error
  • Test the recovery mechanism of the application

Compatibility & Performance Testing

Compatibility testing is a measure of checking if the web application is compatible across multiple browsers. This is also important if you need to check whether the web application is unresponsive to legacy browsers and how you will approach solving that issue.

At the same time, performance testing allows you to measure the application based on predefined metrics. For example, if you are using a microservice architecture, the performance test will allow you to test how efficiently these services work as a suite and individually. 

The third step is to create tests and further execute them. Post-execution, you also need to check on tests that fail and make changes swiftly and effectively. 

#3. Building Tests

Building tests need planning, development, and deployment. Each test case can be different from the other based on the type of web application tests. Here you can either build tests from scratch or have your web app development company offer testing pre-built with their services. However, it may increase the price of web app development which depends on the pricing model of that company. 

Now, if you are to build these tests from scratch, here are some test case scenarios to understand how to create tests. 

Test Case Scenario

Let’s consider a scenario where we introduce an email field for the user in our application flow. But, first, we will need an API call to search for a user in the system as per the email address, for which we can create an essential module for API calls.

Mocking HTTP Requests

Placing the file at 


we get the following module. 

Source: Writing Effective Tests for Modern Web Apps | by Caleb Taylor | Level Up Coding (

Here, the HTTP object from  @core/http is a utility class that handles the HTTP logic of the web app. You need to mockup the HTTPS request instead of the code module for optimal implementation of the logic. 

Global Mock Object

As your web app grows, there are chances of similar API calls from different places into your code, making it challenging to execute the mockup. Even if you redefine the HTTP mockup, it may lead to several bugs. The best practice is to use a single global mock object for each API call making it efficient.

Unit Test for the API module

Unit tests ensure that individual modules and services of your system architecture function as per expectations. Here is an example for lookup API module unit test,

src/app/api/lookup/__tests__/index.spec.ts .

Integration test

Integration tests relate to the microservice architecture where several modules interact with each other to respond to user requests. It allows you to check whether these individual services interact with each other efficiently or not. 

Here is an example of the integration test for lookup view, 

  • Start with the view of lookup 
  • Set up mocks for each  /user/credential_available/v1 call
  • Provide the email address and submit
  • Check the expected function executed for the app.


As the customers’ behavior and market demands change, you need reliable web applications to keep up with them. For such reliability and high-performance web applications, you need to test them extensively; however, building test cases and executing them is not that simple of a task – you need to assess different testing needs, consider various factors and then build tests for optimal results. 


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