Functional Testing

Functional testing of a software product or a mobile application is one of the basic methods of the product quality control which verifies the product compliance with the customer’s requirements. In other words, the main goal of functional testing is to make sure that all software features are able to work as designed and solve user’s tasks under various conditions.

Functional Testing Types

Functional testing of a software product can be performed in two different ways: 

Black box testing 

Black box testing is performed without accessing the code. This method consists in analyzing the outputs of the product functionality based on various data inputs.

White box testing

White box testing is performed with access to the product code. In this case, the test cases are created based on the program code of the product, then various testing methods are performed based on these test cases.


The main types of functional testing are as follows:

  • Smoke testing, which is used to find critical bugs in the product functionality as soon as a new version build is ready. It is performed based on a small set of test cases. The main goal of this type of testing is to determine if it’s possible to proceed to the next stages of functional testing;
  • Feature testing, which is performed to verify that the new features work as defined in the requirements.
  • Regression testing, which is used to ensure that the functionality of the application remains fully operational after the introduction of the new features.
  • Usability testing, which allows to identify factors affecting the user-friendliness of the application or web site interface, ease of navigation, and query input system;
  • Bugs retests – this is a subtype of functional testing performed after the previously found bugs (identified via other testing methods) have been fixed; its goal is to verify that they are actually fixed.

All functional testing types listed above are performed by our team of experts on real equipment and using real devices, both manually and automatically. All tests are carried out in adherence with the test suites compiled for products testing; all errors and bugs found are being recorded in the bug trackers.

Our company offers functional testing services to all project managers, developers and programmers. Our testers utilize various methods and types of testing to check the product quality and timely identify system errors, thus, allowing software producers to improve the quality and convenience of their product for the target market.

Why QA Supermarket?

  • Expert Testing on Demand
  • Upfront NDA
  • Transparent Pricing
  • Free Test Plan
  • No Obligations
  • No Overhead
  • No Sales Pitch
  • 100% Satisfaction Guaranteed

Why do you need professional testing:

  • About 60% of apps fail because of bad quality.
  • Automated testing will not show most of the bugs witch human may get.
  • Most developers are not qualified and not efficient to perform testing of your app.
  • The application must be tested in full – unit test can work, but integration of the all parts of the system can bring lots of surprises (see examples).

Why choose QA Supermarket?

  • Cost effective: Third-party testing on demand reduces expenses for internal QA team and hardware
  • Experienced: All testing is performed manually by highly-trained, knowledgeable experts
  • Transparent: Pricing is provided upfront so you know exactly what you’ll get and what you’ll pay
  • Easy: QA’s interactive dashboard guides you through the process, providing real-time status updates from start to finish
  • Secure: With an upfront NDA, you can be confident we’ll find your bugs while you keep your code

It takes only 3 steps to test your app

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QA Supermarket’s full range of testing services for software, websites and applications include:

Functional testing

Does your product work like it’s supposed to? >

Installation testing

Can people install and load your product quickly and easily? >

Usability testing

Do the interface and other components of the product offer users an optimal experience? >

Interrupt testing

Will interacting with device components or other software cause your product to malfunction? >

Performance testing

Does your product behave like you want under different load conditions? >

Compatibility testing

Will your product look good and work properly across different devices and platforms? >

Stability testing

Will your product continue to perform well over time and through a full range of uses? >

Why QA

Why QA Supermarket?

You no longer need to maintain your own testing department and pay salaries, insurance and taxes. No need to spend money on facilitating tasks and purchasing equipment for testing. QA Supermarket provides an NDA upfront. We provide workflow to guide you through the process from a task definition to final bug list. Get in touch and rest assured that your software will be bug-free soon.

How can QA Supermarket help you?

Business owner

QA Supermarket helps you deliver the a highest-quality product to keep customers happy and your reputation intact

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Project manager

QA Supermarket acts as an extension of your team so you can reach your goals on the timelines you need

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Software developer

QA Supermarket enables you to focus on creating a great product while we keep the bugs out of your code

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