What I tried:
Cloned a package with ert tests (https://github.com/dgutov/robe ) # sidenote this package was previously installed using use-package emacs ~/robe/core-tests.el M-x ert
Selector: t Passed: 0 Failed: 0 Skipped: 0 Total: 0/0 Started at: 2019-11-10 12:31:14-0800 Finished. Finished at: 2019-11-10 12:31:14-0800
This feels wrong because obviously the package has more than 0 tests.
Also btw: how do I run tests in "emacs -batch" mode.