While every software development company strives to produce a product/software that meets the needs of their client and exceed their expectations, very few are ready to spend the required amount of time and effort on QA.
Something most of us in App Dev have heard many a times, developers say, “It’s working fine on my machine”, when the business users come up with issues.
Developer Testing Vs QA Testing:
How many developers test software with the intention of finding its faults? Developer testing mostly covers the happy path. Negative testing, or what happens when something goes wrong is almost never tested. Without blaming the developers for defects, I would like to say that is how the developer can prioritize time for development and testing. In fact, negative testing is not in the scope of unit testing. The time allotted for unit testing in the SDLC (software development life cycle) is also limited.
This is where QA comes in. Scope of QA includes: System Testing, Integration Testing, Regression Testing, UAT (User- Acceptance Testing)
Usage of production-like test data is very important during testing. Developers tend to make up data for testing purposes based on convenience and priority. In real-time when production data is used, totally unexpected results may arise. Setting up a prod-like environment for testing will also reduce potential issues. QA testing is almost always tested with production-like data. Formatting, alignment, visual look and feel of the software may not be high on the priority list of a developer. It’s almost always #1 on the list of business users. Intuitiveness, good look, and feel is the first thing any user looks for.
QA processes also stress on re-testing defects, and identifying scope of regression for every defect fix, for every release. The scope of regression testing for every defect fix is something that could be easily ignored by a developer, unlike a QA, who has overall anticipation of what a potential break/fix could lead to. This ensures that no other part of the software is broken while a fix goes in.
Testing various modules and how they integrate is not always in the scope of testing developers routinely do. When developers work and test on their separate modules, they commonly work. However, it is a whole different story when the two modules are integrated and expected to work. Positive and negative integration testing is essential before the product is released for UAT (user acceptance testing).
Without having to embark more on developer testing, I would like to say, a developer role is designed to develop projects and a tester role is designed to test them, compromising on testing might prove costly .
To make it short, QA takes the role of a business user and does the due diligence before sending the product to the customer. Allotting budget for QA might prove worthy compared to the amount of re-work to be done after a product is released to a customer. A happy customer is what everyone wants. It is always easy to gain a customer’s trust and business with a QA team in place.