Testing is more than just a final checklist; it’s an essential part of building reliable, high-quality websites and applications. From detecting bugs early to ensuring a seamless user experience, testing plays a critical role at every stage of development. In this article, we explore 6 reasons to test your application, the main types of testing, and why innovative teams make testing a priority from day one.
What is testing?
Before anything else, it’s essential to define what testing means in a project. As you might guess, creating a website or mobile app doesn’t happen in one go, and certainly not without errors, unfortunately…
That’s why tests are performed at each development stage to ensure the code functions properly. The goal is to verify that bugs are detected continuously and corrected along the way.
This time dedicated to testing is vital if you want to avoid discovering at the end of the project that your website is defective.
So, what are the different types of tests?
One of the most basic tests is the unit test. It isolates a portion of the code and checks if it behaves as expected.
These tests provide a coverage rate (in %) of the code, but do not verify how code parts interact.
In fact, 100% code coverage doesn’t guarantee your site or app will function correctly, since it doesn’t test the integration between parts.
This is where integration testing comes in; it focuses on verifying how different parts of the code work together.
Once the code is in place, we move on to system testing.
This is one of the most critical phases, as it’s where we test different user journeys and scenarios. Key points in this phase include layout rendering, user interaction, and responsiveness of the site or application.
After all these steps are validated, we proceed to acceptance testing, which ensures the final result matches the client’s expectations.
Throughout the entire process, collaboration between all stakeholders is essential.
What are the benefits of development testing?
1. Early detection of errors
As you might expect, the earlier you start testing, the more you can prevent future issues.
Simple principles like checkpoints with tests allow development to move forward with fewer errors.
It ensures non-regression of the code and maintains code quality throughout the project.
It also helps to quickly locate and fix problems, saving time, effort, and money!
2. Better cod
Naturally, by testing code regularly, you ensure it works properly, and this improves its quality.
Moreover, writing tests before coding can give developers a clear direction, avoiding duplicate or unnecessary features that don’t align with client requirements.
The idea is to stay focused on the goal without getting lost along the way.
3. Written trace
Running tests during development also leaves a written record for future code modifications.
When performing maintenance, one key factor for an external developer is identifying which sections of code are problematic.
This often time-consuming task can be simplified by having documentation from previous tests.
This also helps larger teams working on different parts of the project independently.
4. Peace of mind
In a world where feature demands grow more and more innovative, testing gives fast feedback. This continuous testing approach increases productivity and peace of mind; developers can quickly adjust code as needed when errors occur.
5. Reduction in manual testing
We’ve been talking about time-saving, and that includes reducing manual tests.
Most types of tests today can be automated (unit, API, integration, etc.) using tools like Selenium or Katalon.
Since testing often includes repetitive tasks, automation frees developers to focus on high-value work.
6. Boost in overall performance
As previously mentioned, the goal of testing is to involve all project stakeholders.
To increase team productivity, everyone needs to understand why testing matters.
For instance, a CI/CD pipeline could speed up product delivery to clients and help developers progress faster across different projects.
Best Test Automation Tools in 2025
A good test automation strategy requires a good tool. Here’s a summary of what we consider the best automation tools to implement in 2025:
1. Playwright
- Why it’s #1: Modern, fast, and reliable, built by Microsoft for end-to-end testing across all major browsers.
- Best for: Web app testing at scale, modern frameworks (React, Angular, Vue).
- Strengths:
- Cross-browser (Chromium, Firefox, WebKit)
- Multi-language support (JS, TS, Python, Java, .NET)
- Headless testing + parallel execution
- CI/CD ready
- Price: Open-source
- Ideal for: Agile teams, startups, and enterprises using modern front-end stacks.
2. Selenium
- Why it stays strong: The most battle-tested framework in the industry—flexible, community-supported, and widely integrated.
- Best for: Teams that need total control and browser automation.
- Strengths:
- Supports most programming languages
- Compatible with all browsers
- Strong ecosystem (Jenkins, GitHub, etc.)
- Price: Open-source
- Ideal for: Enterprises, QA teams, and custom testing pipelines.
3. Katalon Platform
- Why it ranks high: All-in-one platform for low-code + pro-code testing, covering web, API, desktop, and mobile.
- Best for: Teams that want speed, coverage, and built-in analytics.
- Strengths:
- Katalon Studio + TestOps for test management
- Easy to use for beginners, powerful for pros
- Works well with CI/CD pipelines
- Price: Free tier + Paid plans (from ~$1,689/year)
- Ideal for: Mid-size companies, QA departments, cross-platform projects.
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