Looks like some pretty bad timing that the feature was removed just as you introduced something that uses it. :(

Generally tests should always tear down whatever they set up, so there shouldn't be a need for a final global teardown (theoretically at least). But in any case, maybe you could use a test listener (https://phpunit.de/manual/6.5/en/extending-phpunit.html#extending-phpunit.PHPUnit_Framework_TestListener) and implement endTestSuite() ? It's not exactly identical since there are generally multiple suites being executed at once, but I think it might meet your needs.

P.S.: In the future, please always associate one project with new tasks. If you're not sure, you can always use the catch-all MediaWiki-General project. And if you're discussing a specific commit, it's good to CC the author/reviewer of the patch.

teardown (theoretically at least). But in any case, maybe you could use a test listener (https://phpunit.de/manual/6.5/en/extending-phpunit.html#extending-phpunit.PHPUnit_Framework_TestListener) and implement endTestSuite() ? It's not exactly identical since there are generally multiple suites being executed at once, but I think it might meet your needs.

We already running a listener but that doesn't do what I need because it is invoked on each test (or suite) and not at the end of the entire run which is the point of overriding PHPUnitCommand::main as the last inception point before the exit.

[0] https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/tests/phpunit/ExecutionTimeTestListener.php

Use register_shutdown_function?