PHPUnit_Extensions_SeleniumBrowserSuite has been working as an extension of PHPUnit_Framework_TestSuite (now PHPUnit\Framework\TestSuite). It looks like it was able to run transparently as a PHPUnit\Framework\TestCase in PHPUnit 6.3.0, but from 6.5.5 (or possibly earlier).
When the class is gone as part of a new major version, phpunit-selenium should rewrite its dynamic generation of test cases not to use this class.
May be related to #2859 If it's not that, I can try to reduce the test case to something smaller and pastable here.
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