Can anyone please tell me what exactly is functional/functionality software testing.?

Answer 1

Software testing is the process used to help identify the correctness, completeness, security and quality of developed computer software.Testing is a process of executing a program or application in the intent of finding errors. With that in mind, testing can never completely establish the correctness of arbitrary computer software. In other words, testing is criticism or comparison, that is comparing the actual value with an expected one.

There are many approaches to software testing, but effective testing of complex products is essentially a process of investigation, not merely a matter of creating and following rote procedure. One definition of testing is "the process of questioning a product in order to evaluate it", where the "questions" are things the tester tries to do with the product, and the product answers with its behavior in reaction to the probing of the tester. Although most of the intellectual processes of testing are nearly identical to that of review or inspection, the word testing is connoted to mean the dynamic analysis of the product—putting the product through its paces. The quality of the application can, and normally does, vary widely from system to system but some of the common quality attributes include reliability, stability, portability, maintainability and usability.A good test is the one which finds an as yet undiscovered error. Refer to the ISO standard ISO 9126 for a more complete list of attributes and criteria.

Answer 2

In functional testing functionality of the module is tested and structure is not considered. It is performed, based on user's perspective. These tests ensure that the system does what users are expecting it to do.

This type of testing means testing the functionality example include input the proper data and checking the output as per the requirement documents.

There are two types of functional testings, they are Positive and Negative functional testing.

Answer 3

In functional testing basically the testing of the functions of component or system is done. It refers to activities that verify a specific action or function of the code. Functional test tends to answer the questions like “can the user do this” or “does this particular feature work”. This is typically described in a requirements specification or in a functional specification.
The techniques used for functional testing are often specification-based. Testing functionality can be done from two perspective:

1)Requirement-based testing: In this type of testing the requirements are prioritized depending on the risk criteria and accordingly the tests are prioritized. This will ensure that the most important and most critical tests are included in the testing effort.
2)Business-process-based testing: In this type of testing the scenarios involved in the day-to-day business use of the system are described. It uses the knowledge of the business processes. For example, a personal and payroll system may have the business process along the lines of: someone joins the company, employee is paid on the regular basis and employee finally leaves the company.
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