Types of Software Testing: Types of Software Testing and Functional Testing

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Contents to be Covered

Types of Software Testing

Types of Software Testing

Functional Testing

This type of testing ignores the internal parts and focuses only on the output to check if it is as per the requirement or not. It is a black-box type testing geared to the functional requirements of an application for detailed information about Functional Testing.

What Do You Test in Functional Testing?

  • Mainline functions: Testing the main function of the application
  • Basic Usability: Checks smooth navigations through the screens without any difficulties.
  • Accessibility: To check accessibility of the system for the user
  • Error Conditions: It checks the error conditions and ensures whether the suitable error message displayed or not.

Types of Functional Testing

  • Unit Testing
  • Integration Testing
  • System Testing
  • Sanity Testing
  • Smoke Testing
  • Interface Testing
  • Regression Testing
  • Alpha Testing
  • Beta Testing
  • White Box Testing
  • Black Box Testing


  • Unit Testing: Testing of an individual software component or module is termed as Unit testing. It is typically done by the programmer and not by the testers, as it requires detailed knowledge of the internal program design and code.
  • Integration Testing: Testing of all integrated modules like code modules, individual applications, client, and server application on the network to verify the combined functionality after integration is termed as Integration testing.
  • System Testing: Using System testing methodology, the entire system is tested as per the requirements. It is a Black-box type testing that is based on overall requirement specification and covers all the combined parts of a system.
  • Sanity Testing: This testing is used to determine if a new software version is performing well enough to accept it for a major testing effort or not. If an application is crashing for the initial use then the system is not stable enough for further testing. Hence a build or an application is assigned to fix it.
  • Smoke testing: This testing technique used to ensure that the build is stable and thorough testing is carried out further. It checks that existence of any defect that can be cause of non-functioning of the software. If tester finds such error even in initial stage itself then testing team can reject the build and inform accordingly to the development team.
  • Interface testing: Interface testing is used to verify whether the communication between two different software is done correctly. A connection that integrates two components is called interface.
  • Regression Testing: Testing an application for the modification in any module or functionality is termed as Regression testing. It is difficult to cover all the system in Regression Testing, so typically Automation Testing Tools are used for these types of testing.
  • Alpha Testing: It is a formal type of software testing which is carried out in the organization itself by the developers. It is performed in the virtual environment in order to check the whether the application is producing desired output or not.
  • Beta testing: It is a formal type of software testing which is carried out by the customer. It is performed in the Real Environment before releasing the product to the market for the actual end-users. It is to test that if there any major conflicts and failure in the software/product or it satisfies the business requirements. It is considered as successful when the customer accepts the software.
  • Black box testing: Black box testing is a method of software testing that examines the functionality of an application without peering into its structures or workings. This method of test can be applied virtually to every level of software testing: unit, integration, system, and acceptance.
  • White box testing: White box testing is a method of software testing that tests internal structures or working of an application, as opposed to its functionality. It is an internal perspective of the system, as well as programming skills, are used to design test cases.


  • Software Testing is important to identify the correctness, completeness and quality of developed system or software application.
  • It checks for Errors (human action that produces the incorrect result)
  • It checks for Bugs (The presence of error at the time of execution of the software)
  • It checks for Faults (State of software caused by an error)
  • It checks for Failure (Deviation of the software from its expected result) .


Q. 1. : An organization wants to release the product in the market in order to get the feedback and the proper working of the software. It will be called as which of the following type of testing?

(1) Beta Testing

(2) Alpha Testing

(3) Smoke Testing

(4) Interface Testing

Answer: (1) Beta Testing

Q. 2. : ________testing is used to determine if a new software version is performing well enough to accept it for a major testing effort or not.

(1) Static Testing

(2) Sanity Testing

(3) Both 1 and 2 are correct

(4) Neither 1 nor 2 are correct

Answer: (2) Sanity Testing

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