PHPUnit_Framework_BaseTestListener class not found
I run tests the following way


I test in a CiviCRM instance that is generated with buildkit (the toolchain provided for CiviCRM developers see https://docs.civicrm.org/dev/en/latest/tools/buildkit/ .
My tests are generated with civix generate:test. Remarks that this generator also creates the file tests/phpunit/bootstrap.php that takes care of the class loading.
I run the test from the extension directory by executing phpunit4 (This version is installed with buildkit).