Regression

How it is used

QA teams run 'regression tests' before releases to catch these problems. People say 'This is a regression from version 4.1' or 'The refactor caused a regression in search.'

Example sentences

1. Search was fast last week, so this slowdown looks like a regression.

2. Full regression testing takes two days before each major release.

Common collocations

• regression test
• cause a regression
• regression testing
• performance regression

Related terms

• QAShort for quality assurance: the work of checking that software meets its requirements and works well. It also names the people or team who do this work.
• test caseOne specific situation you check, with set inputs, steps and an expected result, for example 'logging in with a wrong password shows an error'.
• bugA mistake in a program that makes it behave in a way nobody intended, such as showing wrong results, freezing or closing suddenly.
• test coverageA measure, often a percentage, of how much of the code is run by automated tests. It shows which parts are tested and which are not.
• releaseA version of a product that is made available to users, or the act of making it available. Also a verb: to release a new version.

This word in other fields

The same English word can have a different meaning in another field:

• regression · Data Science & Analytics
• regression · Artificial Intelligence & Machine Learning
• regression · Statistics

More terms: Testing

• unit test
• edge case
• integration test
• mock
• end-to-end test
• flaky
• test suite
• manual testing
• automated testing
• assertion
• smoke test
• happy path