Top Software Testing Companies in Chennai

Chennai is one of the largest, fastest-growing, and most visited cities in India. A vast number of software companies have offices in Chennai and making it the second-largest software exporter in India after Bangalore, while Its Tidel Park is one of the largest IT parks in Asia. Consequently, there is no shortage of software testing service providers as well. Numerous top software testing companies in Chennai offer a wide range of services for reasonable prices. They deal with the apps of different types - web, desktop, and mobile, easily onboard any project whether it is Agile or Waterfall, and provide access to the rich talent pool.

Levels of software testing

To provide first-class software testing services and deliver a product of high quality, the top software testing companies in Chennai get to product testing as early as possible and test it thoroughly on different levels in order to find out all possible weak spots, defects, and their root causes. QA experts differentiate four levels of software testing. Testing on each level is executed one by one. So let’s take a closer look at each one.

Unit Testing

This is the first round of software testing in which each code unit is tested separately from the rest to make sure that it functions as expected. A code unit is considered the tiniest testable software part. In essence, an entire module or class, as well as an individual function or method can stand behind a unit. As long as the white box technique is leveraged to execute unit testing, it is usually conducted by developers who write special code to test a software product. The interesting fact is that unit tests are created before software development. This approach lets developers better understand the way a product should be built. Unit tests can be rerun later each time whenever it is needed. First of all, it is useful to rerun unit tests after the source code refactoring or any modifications to make sure that nothing has been damaged and works as well as before. And otherwise, if something doesn’t work as expected the root cause can be easily detected and the problem can be eliminated on the spot.

Still, since unit testing does not consider unit dependencies and interactions, it cannot cover all issues. Therefore software testing at the rest levels must be executed as well.

Integration Testing

As long as code units must work properly not only in isolation but also while being combined, integration testing is executed as well. Its core aim is to assure that the units can efficiently function together. Integration testing can be executed in a few ways. Let’s consider them more precisely.

Big-Bang Testing

As you may guess, this approach implies a mess related to the fact that all code units are combined at once to undergo testing. The key drawback of big-bang testing is the difficulty to uncover defect localization. Besides, as all units are combined at once, units of high importance are not tested thoroughly in isolation. Generally, big-bang testing is suitable only for simple and small projects.

Incremental Testing

Incremental testing is executed by integrating several logically related units. Later other related units are added gradually and tested. Incremental testing can be also executed in different ways that are worth our attention.

Bottom-up Integration Testing

According to bottom-up integration testing, code units of lower-level are tested foremost, and then high-level units are gradually added to be tested as well. Drivers are utilized to simulate absent high-level code units. Such an approach helps easily identify the defect localization. As for the drawbacks, the key ones are an inability to provide an early prototype and the fact that the critical units are verified after all others.

Top-down Integration Testing

In this case, integration testing begins with higher-level code units and bit by bit proceeds to units of the lowest level. Top-down testing requires the use of stubs which are pieces of code that substitute lower-level units not ready yet. Top-down testing also makes it easy to define defect localization and gives an opportunity to provide an early prototype. However, units of lower levels can be checked improperly.

Sandwich Testing

In fact, sandwich testing is a simultaneous execution of top-down and bottom-up testing, which means that code units of all levels are tested at the same time. Both stubs and drivers are actively used in this case. This type of integration testing is rather complicated and requires special experience and time, as a lot of drivers and stubs must be created in advance.

System Testing

At this level, the whole application, at last, is tested as a unity. The objective of system testing is to assure that the software complies with the stated requirements and QA standards. Besides, at this level, there is an opportunity to check also non-functional aspects of software work like stability, reliability, security, usability, and many others. System testing is crucial because it ensures that an application under testing complies with the whole range of business, functional, and technical requirements.

Acceptance Testing

This is the final level of software testing. Acceptance testing is executed to understand whether an application is ready for release. In the course of acceptance testing, a customer, a limited group of end-users, or an independent QA team checks whether an application meets users’ needs and requirements and corresponds with business requirements that may have undergone numerous changes during the product development process. Once acceptance testing has been successfully completed, an application can be moved to production.

As you can see, the variety of test levels is just one more reason to bring your product to a software testing company in Chennai as early as possible. When an application is more thoroughly tested, a greater number of defects are detected; this ultimately leads to higher quality.