for more information on writing and running tests.
If your test lasts longer than some few seconds, mark it in its
-`ert-deftest' definition with ":tags '(:expensive-test)".
+'ert-deftest' definition with ":tags '(:expensive-test)".
To run tests on the entire Emacs tree, run "make check" from the
top-level directory. Most tests are in the directory
Tests which are tagged ":expensive-test" are enabled additionally, if
you run "make check-expensive" from the top-level directory. "make
<filename>" as mentioned above incorporates expensive tests for
-<filename>.el(c).
+<filename>.el(c). You can also define any ert selector on the command
+line. So "make check SELECTOR=nil" is equivalent to "make
+check-expensive".
** Understanding Emacs Internals.