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* lisp/emacs-lisp/ert.el (ert-test-result): New slot ´duration'.
(ert-run-or-rerun-test): Set it.
(ert-batch-print-duration): New defvar.
(ert-run-tests-batch): Print duration if needed.

* test/Makefile.in (TEST_PRINT_TEST_DURATION): New variable.

* test/README: Explain TEST_PRINT_TEST_DURATION.