A thread being the smallest unit of work a system can perform, thread testing is a software technique used in the early stages of integration to verify the key functional capabilities that carry out specific tasks. This testing is mainly done to make sure every time in the initial stages of integration a system should be capable of carrying out the required functional tasks as needed for final output. This methodology is put to use in testing applications that are based on client server architecture.
The key functional capabilities are demonstrated by testing a string of units that complete a specific function in the application at hand; this is normally done in order to be able to achieve the results one requires. This is usually done because some bugs are hidden in multithreaded systems and can only be discovered when multiple threads interact inside a single, these problems are mainly because of synchronisation.
The thread being a business transaction consisting of a set of functions, it threads throughout the whole system and each function is tested on its own and thereafter added one after the other and then tested thus being tested integrated and subsystems and thereafter as a whole, this approach facilitates early systems.
The reason of undergoing these tests is every time when a class of bugs are encountered in multithreaded systems. These are only seen when threads in multiples are found to interact or communicate on a single thread. Hence, thread testing can also be named as "Thread interaction testing". Although it is not confined to serve as the basis of integration rather it tends to control or regulate the entire software including software development and status sharing.
This type of software testing is well integrated and provides better knowledge about the scope of the project that revolves around the developers and testers.