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Don’t assume ordering in make-process/mix-stderr

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* test/src/process-tests.el (process-tests--mixable): New function.
(make-process/mix-stderr): Don’t assume stdout is merged before
stderr.  POSIX does not require this, and the assumption failed to
hold on my Fedora 28 platform.  See Bug#31214.
This commit is contained in:
Paul Eggert 2018-05-21 12:30:09 -07:00
parent 79f15092b9
commit 7b9fb7ace4
1 changed files with 14 additions and 1 deletions
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15
test/src/process-tests.el
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@ -181,6 +181,17 @@
(should-not (process-query-on-exit-flag process))))
(kill-process process)))))
;; Return t if OUTPUT could have been generated by merging the INPUTS somehow.
(defun process-tests--mixable (output &rest inputs)
(while (and output (let ((ins inputs))
(while (and ins (not (eq (car (car ins)) (car output))))
(setq ins (cdr ins)))
(if ins
(setcar ins (cdr (car ins))))
ins))
(setq output (cdr output)))
(not (apply #'append output inputs)))
(ert-deftest make-process/mix-stderr ()
"Check that `make-process' mixes the output streams if STDERR is nil."
(skip-unless (executable-find "bash"))
@ -200,7 +211,9 @@
(accept-process-output process))
(should (eq (process-status process) 'exit))
(should (eq (process-exit-status process) 0))
(should (equal (buffer-string) "stdout\nstderr\n")))))
(should (process-tests--mixable (string-to-list (buffer-string))
(string-to-list "stdout\n")
(string-to-list "stderr\n"))))))
(provide 'process-tests)
;; process-tests.el ends here.