Software development is writing code. Testing makes sure the code actually works, so in a nutshell: '''Testing is software development''' :-)
== Phan ==
see [[Phan]]
===PHPStan===
https://phpstan.org/ see [[PHPStan seems more polished (perhaps because it's commercial and has a 'pro' version that adds a GUI) whereas phan is the original PHP static analysis tool Rasmus Ledorf uses. Adding a configuration file for your MediaWiki extension is straightforward and would look like this:<syntaxhighlight lang="yaml">parameters: level: 1 paths: - src - tests scanDirectories: - ../../includes - ../../tests/phpunit - ../../vendor</syntaxhighlight> The [https://phpstan.org/user-guide/rule-levels level can be 0 - 9] The paths are the directories of '''your code.''' The scanDirectories are additional paths used to discover symbols, but not analyze for errors. For more advanced usage, see [https://github.com/ProfessionalWiki/Maps/blob/ee88211fadb3573b646cce005383450e96c3054e/phpstan.neon the example of Professional Wiki's Maps extension] which illustrates configuration file includes of a 'baseline'; error message suppression; and directory exclusions of problem code.
===Psalm===