View test result of BrowserTestBase based test? How can I setup my Drupal config to be able to view the results of failed tests using the new BrowserTestBase class in 8.2.x?

I don't see any files generated and the phpunit.xml config does not seem to be getting respected:

&lt;!-- Example BROWSERTEST_OUTPUT_DIRECTORY value: /path/to/webroot/sites/simpletest/browser_output --&gt;
    &lt;env name="BROWSERTEST_OUTPUT_DIRECTORY" value="/var/www/testing" /&gt;


The command I am using is:

vendor/bin/phpunit -c core/phpunit.xml --group tvi


I have some failing tests but I can't see what the test sees.
Figured it out. Before calling parent::setUp(), I set:

$this-&gt;htmlOutputEnabled = true;