How to make `arc diff` run `arc unit --everything` by default?


I would like to configure arc diff to run arc unit --everything by default.

Currently, when I execute arc diff in my codebase, it reports that no unit tests need to be run in almost all cases. I would like to change that, so that it always executes all tests, i.e. such that $this->getRunAllTests() == true in my ArcanistUnitTestEngine. For linters, there is the --lintall option, but there seems to be no equivalent for unit tests.