So, Travis is currently using PHPUnit 4.8.35 to run our suite of tests.

• PHPUnit 6.1 is the current stable release series. It became stable on April 7, 2017. Support for PHPUnit 6 ends on February 8, 2019.

• PHPUnit 5.7 is the old stable release series. It became stable on December 2, 2016. Support for PHPUnit 5 ends on February 2, 2018.

• PHPUnit 4.8 is no longer supported. It became stable on August 7, 2015. Support for PHPUnit 4 ended on February 3, 2017.

• PHPUnit 6 requires PHP 7.0 or PHP 7.1

On an up to date Mac, installing PHPUnit with brew, you get PHPUnit 6.1.3

When you go on to run the unit test suite that comes with Joomla you get

PHP Warning: Uncaught Error: Class 'PHPUnit_Util_ErrorHandler' not found in /Users/phil/Sites/joomla-cms/tests/unit/core/helper.php:52

Therefore the unit test suites are not compatible with current stable release of phpunit...

We cannot run an up to date phpunit version in travis because we need PHP 7 for that.

even removing PHPUnit_Util_ErrorHandler from helper.php leads to the next error

Fatal error: JLoader::main(): Failed opening required 'PHPUnit/Extensions/Database/TestCase.php'

So the future of unit testing in Joomla is what exactly?

@mbabker