Default MediaWiki versions
On the Clean machnine extension testing server there are multiple versions of MediaWiki. Because a extension may react different on a different MW version. The extension testser starts with MW version 1.12
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No real stable versions
Mediawiki uses a continuous integration model, which does not have a concept of "stable version". The mediawiki developers do release quarterly snapshots. These could be considered stable releases, and the latest of these could be termed "stable version", if you want to stretch the truth a little.
However, the mediawiki developers themselves don't really use this nomenclature, they ensure that all their code runs in their production environment, and they strongly recommend that people use the latest version of the software, to stay ahead of potential security issues.
Quotes from Sources
Continuous integration
MediaWiki is now using a "continuous integration" development model with quarterly snapshot releases. The latest development code is always kept "ready to run", and in fact runs our own sites on Wikipedia.
Release branches will continue to receive security updates for about a year from first release, but nonessential bugfixes and feature development happen will be made on the development trunk and appear in the next quarterly release.
http://lists.wikimedia.org/pipermail/mediawiki-l/2006-April/011090.html
Latest version
Developers of MediaWiki, including the release manager, Brion Vibber, strongly recommend that wiki operators subscribe to the mediawiki-announce mailing list, which receives notification of all releases, and ensure that their wiki runs the most up to date version of the software possible. These announcements are also posted to mediawiki-l and wikitech-l.
http://www.mediawiki.org/wiki/Version_lifecycle
Implementation for the extension testing
This should me that the extension tester should be able to support all intermediate versions of MW. Thats practical impossible to do.
Standard
The clean machine for extension testing is default installed with the "major" versions which will be released each quarter. This standard so if this is sufficient for the persons who want to test the extension he is ready to go.
Special version
If you need to test to a specific "not major" version you are free to do so. Start with the "major" version on the clean machine and update this to the version you wish to use. You are completely free to do so. So extension may be tested on each MW version.
