Quality Assurance (QA) in web development is gaining a good repute because with the internet subjugating the world, websites need to be on point! Hence, QA snaps into action!
However, to deliver the best software testing services it is required to put a whole lot of data sets through tests. So, it can be a very daunting task for the software testers to test each set of data with heaps of input combinations.
There is thus, a great need of the easy-ways-out and simple techniques through which an intelligent selection of the certain test cases is possible so that every other case is covered under it.
One such technique is BVA!
What is BVA?
In software testing, the Boundary Value Analysis (BVA) is a black box test design technique based on test cases. This technique is applied to see if there are any bugs at the boundary of the input domain. Thus, with this method, there is no need of looking for these errors at the center of this input.
BVA helps in testing the value of boundary between both valid and invalid boundary partitions. With this technique, the boundary values are tested by the creation of test cases for a particular input field.
The extreme ends or boundary partitions might depict the values of lower-upper, start-end, maximum-minimum, inside-outside etc.
This technique is an easy, quick and brilliant way to catch any input errors that might occur to interrupt the functionality of a program.
So, to save their time and to cut the testing procedure short, the experts delivering software testing and quality management services rely on the Boundary Value Analysis method.
For testing of data related to boundaries and ranges, the method is considered as a very suitable one.
An Example of Boundary Value Analysis:
Consider the testing of a software program that takes the integers ranging between the values of -100 to +100. In such a case, three sets of the valid equivalent partitions are taken, which are – the negative range from -100 to -1, zero (0), and the positive range from 1 to 100.
Each of these ranges has the minimum and maximum boundary values. The Negative range has a lower value of -100 and the upper value of -1. The Positive range has a lower value of 1 and the upper value of 100
While testing these values, one must see that when the boundary values for each partition are selected, some of the values overlap. So, the overlapping values are bound to appear in the test conditions when these boundaries are checked.
These overlapping values must be dismissed so that the redundant test cases can be eliminated.
So, the test cases for the input box that accepts the integers between -100 and +100 through BVA are:
- Test cases with the data same as the input boundaries of input domain: -100 and +100 in our case.
- Test data having values just below the extreme edges of input domain: -101 and 99
- Test data having values just above the extreme edges of input domain: -99 and 101
This is a very basic example to understand the BVA testing technique!
With this technique, it is quite easy to test a small set of data in place of testing the whole lot of data sets. This is why, in software testing and quality management services, this method of testing is adopted more often.
Evaluation of Boundary Value Analysis as a Software Testing Technique
Boundary Value Analysis Advantages:
- The BVA technique of testing is quite easy to use and remember because of the uniformity of identified tests and the automated nature of this technique.
- One can easily control the expenses made on the testing by controlling the number of identified test cases. This can be done with respect to the demand of the software that needs to be tested.
- BVA is the best approach in cases where the functionality of a software is based on numerous variables representing physical quantities.
- The technique is best at revealing any potential UI or user input troubles in the software.
- The procedure and guidelines are crystal clear and easy when it comes to determining the test cases through BVA.
- The test cases generated through BVA are very small.
Boundary Value Analysis Disadvantages:
- This technique sometimes fails to test all the potential input values. And so, the results are unsure.
- The dependencies with BVA are not tested between two inputs.
- This technique doesn’t fit well when it comes to Boolean Variables.
- It only works well with independent variables that depict quantity.
In BVA, the software testers have found a fairly simple and correct testing method. This technique can be one of the most important testing techniques if used with care and correctness.
However, the technique is a little limiting when there are some issues with variable dependency or when a foresight is needed for the functionality of a system. With its inexpensive operations and more apt ways of using it, the BVA can become one of the most used testing techniques in the times to come.
But even today, many of the companies and experts delivering the software testing services, have adopted the BVA methods of testing.
Vin Boris is Social Media Marketer & Content Writer at SoftProdigy. SoftProdigy is web design and development company striving in IT industry from more than 10 years & have worked for hundreds of clients including big & small brands.