Mumbai University > Information Technology> Sem 8 > Software Testing Quality Assurance

Marks: 5M

Year: May 2016

i. Failure:

• A failure is said to occur whenever the external behavior of a system does not conform to that prescribed in the system specification.

• If under certain circumstances the defects get executed by the tester during the testing then it results into the failure which is known as software failure.

• Failure occurs when fault executes.

ii. Defect:

• Defect is the difference between expected and actual result in the context of testing.

• Defect is the deviation of the customer requirement.

• Defect is an error found AFTER the application goes into production.

• A defect occurs only after a mistake done from the developer's end.

• Programmatic errors give rise to software defect.

• In software testing a defect is considered to be anything that can hamper the functioning or execution of the software application or service.

• For instance, a defect can be either a failure of a certain section of the code to function accurately, a flaw in the design of the system, or a fault, which could either be an error in the program.

iii. Error:

• An error is a state of the system. In absence of any corrective action by the system, an error state could lead to a failure which would not be attributed to any event subsequent to the error.

• It the one which is generated because of wrong login, loop or due to syntax.

• Error normally arises in software.

• Error means to change the functionality of the program.

• This is a part of a system state that is liable to lead to a failure.

• Hence the process of failure manifestation can therefore be represented as a behavior chain as follows:

fault ->error ->failure