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'''System under test''' ('''SUT''') refers to a [[software system|system]] that is being tested for correct operation. According to [[ISTQB]] it is the test object.<ref>{{cite web|url=http://glossary.istqb.org/search/test%20object|title=ISTQB Glossary|website=glossary.istqb.org|accessdate=2018-02-05}}</ref><ref>{{cite web|url=https://robots.thoughtbot.com/don-t-stub-the-system-under-test|title=Don't Stub the System Under Test|website=robots.thoughtbot.com|date=22 November 2013 |accessdate=2018-02-05}}</ref><ref>{{cite web|url=https://www.itwissen.info/SUT-system-under-test.html|title=SUT (system under test)|website=www.itwissen.info|language=de|accessdate=2021-02-24}}</ref>

{{Unreferenced|date=March 2012}}

'''System under test''' ('''SUT''') refers to a [[software system|system]] that is being tested for correct operation. The term is used mostly in [[software testing]].

From a [[unit testing]] perspective, the system under test represents all of the classes in a test that are not predefined pieces of code like stubs or even mocks. Each one of this can have its own configuration (a name and a version), making it scalable for a series of tests to get more and more precise, according to the quantity of quality of the system in test.

A special case of a software system is an [[application software|application]] which, when tested, is called an application under test.

The term ''SUT'' means also a stage of maturity of the software, because a system test is the successor of integration test in the testing cycle.

The ''SUT'' refers to what are the items, part of the whole system, which are part of the test.

Linked to the notion of test is the ''Test harness'' which is all the means required to perform the test activities

== See also ==

{{Portal|Software Testing}}

* [[Device under test]]

* [[Test Harnessharness]]

== References ==

{{reflist}}

== External links ==

* [https://www.healthit.gov/sites/default/files/ss170.314c1-3_9_11_13.pdf Test Procedure for §170.314(c) Clinical quality measures]

* [http://xunitpatterns.com/SUT.html xUnit Patterns SUT]

[[Category:Software testingquality]]

[[Category:Systems engineering]]

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{{Portal|Software Testing-type-stub}}