Additional changes for "make check-expensive"

* CONTRIBUTE : Encourage use of ":tags '(:expensive-test)".
Explain make target `check-expensive'.

* etc/NEWS: Mention new make target `check-expensive'.

* test/automated/Makefile.in (check-doit): New target.
(check, check-expensive): Use it.

1 files changed, 8 insertions, 0 deletions

diff --git a/CONTRIBUTE b/CONTRIBUTE
index 9061007fc9c..9c53fe2cccc 100644
--- a/CONTRIBUTE
+++ b/CONTRIBUTE
@@ -251,12 +251,20 @@ Emacs uses ERT, Emacs Lisp Regression Testing, for testing.  See (info
 "(ert)") or https://www.gnu.org/software/emacs/manual/html_node/ert/
 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)".
+
 To run tests on the entire Emacs tree, run "make check" from the
 top-level directory.  Most tests are in the directory
 "test/automated".  From the "test/automated" directory, run "make
 <filename>" to run the tests for <filename>.el(c).  See
 "test/automated/Makefile" for more information.
 
+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).
+
 ** Understanding Emacs Internals.
 
 The best way to understand Emacs Internals is to read the code,