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ERT supports automated invocations from the command line or from
scripts or makefiles. There are two functions for this purpose,
ert-run-tests-batch and ert-run-tests-batch-and-exit.
They can be used like this:
emacs -batch -l ert -l my-tests.el -f ert-run-tests-batch-and-exit
This command will start up Emacs in batch mode, load ERT, load
my-tests.el, and run all tests defined in it. It will exit
with a zero exit status if all tests passed, or nonzero if any tests
failed or if anything else went wrong. It will also print progress
messages and error diagnostics to standard output.
If ERT is not part of your Emacs distribution, you may need to use
-L /path/to/ert/ so that Emacs can find it. You may need
additional -L flags to ensure that my-tests.el and all the
files that it requires are on your load-path.