====== Regression Test ======

[[public:99_annexes:annex-b-terms-and-definitions:start|Go to Terms and Definitions]]

===== Discussion =====

A Regression Test is a [[public:99_annexes:annex-b-terms-and-definitions:t:test|Test]] performed after a [[public:99_annexes:annex-b-terms-and-definitions:c:change|Change]] to determine whether the Change adversely affected previously verified behavior.

Regression Tests may be needed after:

  * A defect correction
  * A software enhancement
  * A [[public:99_annexes:annex-b-terms-and-definitions:c:configuration|Configuration]] Change
  * A data-model or schema Change
  * A dependency Change
  * Replacement of a software or hardware component
  * Modification of a [[public:99_annexes:annex-b-terms-and-definitions:t:test_asset|Test Asset]]
  * A Change to an external service or operational environment

The applicable Regression Tests may be selected using the [[public:99_annexes:annex-b-terms-and-definitions:m:maintained_item|Maintained Item]], its identified dependencies, expected Change effects, applicable [[public:99_annexes:annex-b-terms-and-definitions:r:requirement|Requirements]], [[public:99_annexes:annex-b-terms-and-definitions:m:maintainability_criterion|Maintainability Criteria]], and conditions of the applicable [[public:99_annexes:annex-b-terms-and-definitions:c:change_authorization|Change Authorization]].

===== Definition =====

//test performed after a change to determine whether previously verified behavior has been adversely affected//

===== Source =====

[[https://www.omgwiki.org/dido/doku.php?id=dido:public:ra:xapend:xapend.a_glossary:r:regressiontesting|DIDO Reference Architecture, Regression Testing]], adapted

ISO/IEC/IEEE 29119-1:2022, Software and systems engineering — Software testing — Part 1: General concepts, supporting source

===== Note =====

Regression Testing is the activity of selecting and performing one or more Regression Tests. A Regression Test is an individual Test used in that activity.

A Regression Test examines behavior that was verified before the Change. Verification of the intended Change itself remains a separate activity.

An applicable Regression Test may be newly defined or may reuse an existing Test. Change-impact analysis may determine that only a subset of available Regression Tests applies to a particular Change.

A successful Regression Test indicates that the examined previously verified behavior was not adversely affected under the Test conditions. It does not establish that no other regression exists.

===== Example =====

A Change replaces a [[public:99_annexes:annex-b-terms-and-definitions:t:test_executable|Test Executable]] dependency. A previously successful Test is performed again to determine whether the replacement altered the Test Executable’s previously verified behavior. In this use, the repeated Test is a Regression Test.

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