When it comes to software testing there is no trial and error method. Everything in the testing procedure is systematic and laid down with clear guidelines. And yet quite often a software tends to run into problems at the performance testing stage. If the source of the error is not known, then correcting it becomes even more troublesome.
Testing each component of the software as an individual entity is known as Isolation Testing. In this testing procedure, the final product is not tested as a whole but in small individual parts.
The need for Isolation Testing lies in the fact that when the component or software as a whole is tested, mostly the root cause of errors is not known. At such times, breaking the software into small modules and then testing each of them in isolation gives better and more fruitful results. The erroneous module can be easily identified and necessary bug fixes can be done to tighten its performance.
Isolation Testing forms an integral part of software testing. Its key features are:
Isolation Testing can be conducted at any time when the root cause of an error is not known. Although, it is not specific to Performance Testing, but most times it is used when the system or software does not operate or perform in the desired manner. In other words, Isolation Testing can be conducted at just about any testing stage so as to identify the cause of the malfunction.
The main advantage of Isolation Testing is that it is very precise in nature. As such, when an unexpected error occurs, Isolation Testing can give its exact cause. Once the cause is correctly known it is just a matter of modifying the code to fix it. It is this very feature that makes Isolation Testing a mandatory and irrefutably important aspect of software testing.
A person can keep going in loops trying to look a needle in a haystack. But, when the same haystack is divided into small manageable portions, the task of searching out the needle becomes that much faster and efficient. Exactly is the case with Isolation Testing.