Every system usually get upgraded sometimes for different causes like change of policy, development or product simply to identify a limited. Requirement ought to be utilized as a baseline for testing to confirm that the existing plus brand-new performance work. Test case is extracted for every prerequisite as a option of proving which the system or changes being used is prepared for day to day company utilize without error and/or negative impact about the existing performance.
Requirement itself changes from time to time plus certain become obsolete and also to be removed review testcase . Although the key activity of being tester is to execute test, retaining prerequisite list is crucial to have the ability to obtain as countless problems as potential inside the shortest time. Associating every case with prerequisite, as a source, is a good option to handle your time effectively. I have seen examples where instances were built without prerequisite can cause hours, days plus days of testing efforts without clear objective.
There is not any difficult plus fast guideline how to obtain the instances however, I find it simpler to begin thinking from test kinds. As an example,
Requirement: User must have a valid login and password to login.
Question to inquire about oneself when developing test case might be:
1 what functional abilities I must test?
2 what non-functional attributes to be included?
3 what security constraint?
4 what negative tests ought to be considered i.e. invalid login and/or account.. etc.
As you can view it is very easy to create at the least 2 instances, one being favorable and something being unfavorable test, from one prerequisite. Note that test type is context specific meaning specific types are far more appropriate for specific application. I would normally finish first round of fixed test with 2 aspects without taking too long plus move to the next prerequisite. As you understand more how certain requirements are connected together situation based test case is developed how to obtain it from situation is away of range inside this topic.
Summary
Test case ought to be based on prerequisite plus if there isnt one you can check whether or not brand-new requirements should be added regardless of whether it is very practical or non-functional. Maintaining prerequisite list is significant to ensure that your testing efforts have clear objectives. Finally, try thinking different types of testing to create different test instances this option you 1 view the situation from different perspective 2 have a superior learning of the system when several requirements are set together.
source:http://3dsmod.net/index.php/2012/07/software-testing-101-ideas-on-how-to-write-test-cases-that-will-find-more-defects-in-less-time/