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for an older version of Zend Framework.
You can find the documentation of the current version at:
Introduction to Zend\Test — Zend Framework 2 2.3.9 documentation
The Zend\Test component provides tools to facilitate unit testing of your Zend Framework applications. At this time, we offer facilities to enable testing of your Zend Framework MVC applications.
PHPUnit is the only library supported currently.