What is Stack Functional Testing? | Importance & Benefits Explained

Stack Functional Testing

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Heard of function and testing separately, but what exactly is functional testing??

Let’s understand.

Functional testing is a method used by QAs to check whether the software is behaving in accordance with pre-established criteria.

It uses “black-box” testing strategies, where the tester is blind to the interior workings of the system. Functional testing only seeks to verify whether a system functions as intended.

Types of Functional Testing

In software testing, a system is tested against practical requirements and specifications.

Software testing involves running a program or application to verify that the system is bug-free and to see if the outcomes match what was anticipated. Either manually or with the aid of automated instruments.

Software testing can be divided into two groups:

  1. Functional testing
  2. Non-Functional testing

Let’s look at each of these in detail.

    I.        Functional testing

To ensure that software functions properly, functional testing examines every program component. It confirms that the system should function as anticipated when a user or another system immediately utilizes one of its features.

The following are the typical kinds of functional testing:

●    Unit Testing

To ensure that each block of code/unit carries out its intended transformation of inputs into desired outputs for the next module, unit testing should commence at the very beginning. Tests a specific software element or component to ensure it operates as intended.


●    Integration Testing

Checks that the software’s various individual units and components work together as a unit and transmit data and instructions throughout the system in accordance with the built-in specifications.


●    Smoke Testing

Smoke testing is a subset of test cases used to quickly test the most important or critical features of the software in order to determine whether it is stable enough to continue on to more thorough tests. Execute before the software build is subjected to in-depth functional or failed tests.

●    Sanity Testing

When you receive a software build, make sure that any small adjustments and fixes made to the code body don’t have unintended consequences in various system components. You should also make sure that any bugs have been resolved. In order to avoid wasting time and money on more thorough testing, the build will be denied if sanity tests fail.

The Advantages of Functional Testing

The benefits of functional testing are as follows:

  1. It guarantees the client’s or end user’s satisfaction.
  2. It creates software or products without errors.
  3. It guarantees that all requirements will be fulfilled.
  4. It guarantees that every feature of an application, piece of software, or other merchandise operates correctly.
  5. It guarantees that the program or product performs as anticipated.
  6. It provides protection and security.
  7. It raises the level of the product’s excellence.
  8. The product’s or software’s risks and damages are diminished.

How does Functional Testing work?

One usually needs to follow a process that looks something like this when performing functional tests; below is the process given:


  • The tester verifies the software application’s prerequisite specification.
  • The requirement specification tester will develop a strategy the following research.
  • The tester will create the test case after organizing the tests.
  • Case tester will create a document with the traceability matrix after creating the test.
  • The tester will carry out the test case creation.
  • Examining the application’s covered testing region through coverage analysis.
  • To handle defect resolution, defect management should take action.

The software is functionally sound, and the test was successful if the actual and anticipated outcomes match. If they do not align, there is a problem with the software.

Testing has two Viewpoints –

Testing requirements-focused testing, based on risk criteria first to assess the most crucial and fundamental features and functions.

Business-process-focused testing relies on the knowledge of end-user business requirements to evaluate application performance in the context of use cases.

In order to assess application performance within the framework of use cases, business-process-focused testing depends on an understanding of end-user business requirements.

What are the best tools for Functional Testing?


Applications are created especially for the work that needs to be done quickly and effectively in the age of automation.

Highly reliant on reducing job effort with the aid of different tools.

There are numerous testing tools accessible. Simply enter “test tool” to get various results, from open source to the best of the best—all based on various presumptions.

Different kinds of functional testing tools include:

  • Selenium
  • Katalon Studio
  • UFT (Unified Functional Testing)
  • TestComplete
  • Water
  • Ranorex,
  • Robot Framework


Hence, any software testing method must include functional testing. It ensures that a system performs in real-time precisely as intended.


Since functional testing is conducted from the user’s viewpoint, it delivers a high-quality product that satisfies client needs and offers extremely positive user experiences. Naturally, this simplifies life for both company personnel and developers.


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