A staggering percentage of software projects are nipped in the bud and fail to reach completion. In fact, the Standish group reports that over 80% of developmental projects are disastrous either because they are missing. A vital function, fail to execute in real time, or fly over the set budget. In addition, 30% of software projects are executed so poorly that they have to be cancelled before the completion! The United States economy loses $50-$150 billion per year due to failed IT projects.Are software bugs to be blamed for the predicament? and quality affects.
Software bugs have been around since time immemorial, and they always find a way of turning up in codes at the most inopportune times. Try as we may, there is no wave of the magic wand to eradicate their existence for the better. Today’s cutthroat business climate, intense cost pressures, intensified by a dearth of staff and time, has rendered “need for speed” an apt mantra for all developmental projects in addition to the stress on quality. So what are some practical ways to improve the quality of an application early on in the development lifecycle, rather than when it’s too late to pick out thorns?
Test Driven Development (TDD)
Working on the concept of “get something functioning now and perfect it later”, TDD is a developmental approach where the developers generate automated unit tests on their source code, and use the results to create the methods that get the work done smoothly. After each test is conducted successfully, code refactoring is done, followed by a series of similar or same tests. The entire sequence is iterated for as many turns as it takes, until each unit is working according to the desired specification.
TDD can help in procuring top-notch quality applications in lesser time, in contrast with other older approaches. Proper implementation of Test Driven development entails the testers and developers to anticipate precisely how the application and its various features will be used in real world scenarios.
Behavior Driven Development (BDD)
In this ingenious approach to software development, an application is designed and specified based on the description of how its behavior should appear to a third party observer. Behavior driven development seeks the help of stakeholders to develop a clear comprehension of the desired software behavior and its uses in the real world. It can be construed as an extension of TDD, as it focuses on writing test cases in a natural language that can even be understood by non-programmers.
BDD developers use the ubiquitous language of domain-driven design in combination with their native language to describe the benefits and purposes of their code. This allows the behavior driven developers to concentrate solely why the code should be created, rather than getting stuck in the technical details. This also alleviates the need for translation between the technical language of the code, and the domain language spoken by the project management teams, stake holders, users, and businesses.
After unit testing is successful, various modules or units have to be integrated, which generates the need for integration testing. The purpose of this testing is to validate the reliability, performance, and functional between the integrated modules. These are automated tests, meant to hit external systems such as services and data bases. Integration testing can serve to expose troubles between the program components and the interfaces, before the problem appears in the real world execution.
This is where a QA tester verifies if the application meets the preset requirements. Tests should include:
Negative Testing: What happens when the user inputs bad data into every field?
Positive Testing: The happy path where every field is input correctly.
Double Click Testing:What happens when the user double clicks buttons that should be single clicked.
Edge Testing: The results expected when the user enters long strings, maximum dates, minimum dates, high numbers, low numbers, or blanks.
Performance Testing: Test areas of an application where high usage and load is expected.