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System testing

System testing is concerned with the behavior of a whole system. The majority of functional failures should already have been identified during unit and integration testing. System testing is usually considered appropriate for comparing the system to the non-functional system requirements, such as security, speed, accuracy, and reliability. External interfaces to other applications, utilities, hardware devices, or the operating environment are also evaluated at this level.

Objectives of testing

Testing is conducted in view of a specific objective, which is stated more or less explicitly, and with varying degrees of precision. Stating the objective in precise, quantitative terms allows control to be established over the test process.

Testing can be aimed at verifying different properties. Test cases can be designed to check that the functional specifications are correctly implemented, which is variously referred to in the literature as conformance testing, correctness testing, or functional testing. However, several other nonfunctional properties may be tested as well, including performance, reliability, and usability, among many others.

Other important objectives for testing include (but are not limited to) reliability measurement, usability evaluation, and acceptance, for which different approaches would be taken. Note that the test objective varies with the test target; in general, different purposes being addressed at a different level of testing.

References recommended above for this topic describe the set of potential test objectives. The sub-topics listed below are those most often cited in the literature. Note that some kinds of testing are more appropriate for custom-made software packages, installation testing, for example; and others for generic products, like beta testing.

Qualification testing

Qualification testing checks the system behavior against the customer’s requirements, however these may have been expressed; the customers undertake, or specify, typical tasks to check that their requirements have been met or that the organization has identified these for the target market for the software. This testing activity may or may not involve the developers of the system.

Installation testing

Usually after completion of software and acceptance testing, the software can be verified upon installation in the target environment. Installation testing can be viewed as system testing conducted once again according to hardware configuration requirements. Installation procedures may also be verified.

Alpha and beta testing

Before the software is released, it is sometimes given to a small, representative set of potential users for trial use, either in-house (alpha testing) or external (beta testing). These users report problems with the product. Alpha and beta use is often uncontrolled, and is not always referred to in a test plan.

Reliability achievement and evaluation

In helping to identify faults, testing is a means to improve reliability. By contrast, by randomly generating test cases according to the operational profile, statistical measures of reliability can be derived. Using reliability growth models, both objectives can be pursued together.

Questions & Answers

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rana Reply
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majid
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Amissah
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Engr Reply
what is software?
Abdullahi Reply
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majid
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Abdullahi
majid
Abdullahi
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majid
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Abdullahi
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majid
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Eswar Reply
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Abdullahi
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Profneil Reply
The simplist model of software development paradigms all the phace of software development life cycle will functional one after another in linear manner. * When the phase is finish then only the second face will start.
udara Reply
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dawit
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Abdullahi
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Syed
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dawit
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Shantanu
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khan Reply
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YUSUF Reply
Coding is a type of a language that a computer understand..
HANAN
it's how a computer interprets software, programs and what to do when it reads the code. Code is like our sub-conscious but to a computer if that makes sense.
Dustin
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Oliver Reply
computer science class or just take a introduction to computers class. You can always try to find a mentor or self teach yourself as well.
Dustin
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diwakar
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Sarik
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Tom Reply
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Yogesh
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Mark
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Mark
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Khizer
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Khizer
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Peterson
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Xotambek
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Peterson
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Shey
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leo
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leo
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Khizer
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Purity
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Mark
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Khizer
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Khizer
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Khizer
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Shey
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NICCK-PAT
Great ,I am NICCk-PAT in Paris France.
NICCK-PAT
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Dustin
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Ahmad Reply
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Sameer
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Sarik
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Vikki
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Vikki
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Pavan
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Pavan
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Louis
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Louis
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Shankar Reply
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Dustin
really
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HANAN Reply

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Source:  OpenStax, Software engineering. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10790/1.1
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