Written By :Appsierra

Fri Jul 07 2023

5 min read

List Of Different Approaches To Perform Functional Testing

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Approaches To Functional Testing

Different approaches to functional testing can be divided into two main categories, which are manual and automated. Manual testing is where the tester performs the work, whereas automated testing is where the tester is assisted by software. 

There are many different techniques for performing functional testing, and the approach choice depends on the software being tested. The different approaches to performing functional testing give an overview of both manual and automated testing approaches and their benefits. 

A common approach to functional testing is called black-box testing, where the tester is only given the software's functionality and not the internal structure. 

The tester will create test cases based on the functionality and will not have any knowledge of the code. Black-box testing can be further divided into two categories: equivalence partitioning and boundary value analysis. 

So that was one of the examples of the different approaches to functional testing. Much more is involved than that. Various techniques can be chosen to fit your specific needs and goals. 

This essay will take you about functional testing, functional testing in an agile environment, and its different approaches. So keep reading, and you will be all set!

Also Read: Software Testing Services 

What Are The Functional Testing Approaches?

You might want to run various functional tests as you test your application. Here are some of the functional testing approaches: 

1. Unit Testing

As the name implies, unit testing involves checking each piece of software's functionality separately. A module, class, component, element, single function, method, or procedure can all be considered units. 

This is one of the approaches to functional testing that can be very helpful in the early stages of the software development life cycle to find errors, bugs, or defects. Unit testing cuts down on the overall cost and length of software development.

Suggested Read: Find Bugs Effectively In Website

2. Integrity Testing

Integrity testing examines how well combinations of different software modules work together. Even though individual modules may have already passed their independent tests, additional testing is required to ensure that everything functions as intended when they depend on other modules for proper operation.

Read Next: Training Vs Operations

3. Black Box Testing

Black box testing examines the production of predetermined outputs using a variety of inputs. The name refers to the test case, and, by extension, the tester, which is only interested in function verification, is unaware of the contents of the code being tested. The black and white box testing are the two most basic approaches to functional testing. 

 Approaches To Functional Testing
 Functional Testing Approaches

4. White Box Testing

On the other end of the spectrum are white-box tests. Tests are run primarily to confirm the robustness of the code rather than its complete functionality because they are predicated on knowing exactly what is happening with the code being tested

Unit tests and the early stages of the integration phase are used to perform white box testing at the start of the development process. 

5. Usability Testing

The main goal of this testing is to ensure that the user is happy with the application and can easily use the system application. It determines if there are any issues with using software programs. 

6. Smoke Testing

Smoke testing is carried out to ensure that the application's most crucial components function as intended. It is not meant to be exhaustive, as it is only the first round of testing. 

Smoke tests make sure that the application is at least minimally functional. If not, there is no need to move on to more in-depth testing, and the application can be sent back to the development team for review immediately. 

7. Sanity Testing

In some ways, sanity testing is related to smoke testing because both are meant to check for basic functionality and possibly avoid thorough testing of faulty software. 

The distinction is that sanity checks are carried out later in the procedure to determine whether a new code modification has had the intended impact. It is a "sanity check" on a particular change to see if the new code performs roughly as anticipated. 

Therefore, these are the various approaches to functional testing.

Suggested Read: Smoke Testing vs Sanity Testing

Functional Testing In An Agile Environment!

AppSierra is a company that offers a suite of software testing services. They guarantee end-to-end functional testing. AppSierra provides functional testing in an agile environment, which consists of different approaches, from smoke testing to exploratory testing

Appsierra's team offers a variety of testing solutions that can be tailored to meet your needs for web functionality testing and QA services. 

AppSierra offers different approaches to functional testing. It also keeps a helpful testing procedure that is designed to be agile. This procedure starts from: 

1. Project Start-Up

After defining business objectives, they develop a test roadmap. 

2. Analysis

They scrutinize the project and software specifications. 

3. Testing

They integrate the necessary functional testing types with automated testing.

Relatable Read: Benefits Of Automated Testing

4. Optimization of Test Models

They shorten test cycles while increasing accuracy. 

5. Reporting

They use test reports to analyze testing results. 

AppSierra is Here to Help You With Its Testing Services

1. Quality Engineering

2. Digital Assurance

Reading is just not enough; visit AppSierra today and experience it yourself!


Functional testing has a lot of variations that can be tailored to meet your company's needs. It is one crucial test to perform on any application or software to ensure it is correct. 

Lastly, many different approaches to functional testing can be used to ensure the quality of a software application. Each method has its benefits and drawbacks, but in the end, it is up to the development team to choose the right testing approach for the project. 

Frequently Asked Questions (FAQs) 

Q1. Which four types of Integration Testing are there?

There are three ways to carry out this integration test:

  1. Integrity testing from the bottom up 
  2. Integration Testing from the Top 
  3. Testing Sandwich Integration 

Q2. Smoke or Sanity, which comes first?

First, sanity tests are conducted, then smoke tests. Smoke testing is carried out in the early stages of the software development life cycle (SDLC). At the same time, sanity testing is carried out in the SDLC's final stages.

Q3. What are the basic approaches to Functional Testing?

Testing is typically divided into four levels: unit/component testing, integration testing, system testing, and acceptance testing.

Also Read: Top 30 Functional Testing Tools

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