bug#46351: 28.0.50; Add convenient way to bypass Eshell's own pipelining

[Lars Ingebrigtsen]

Sean Whitton <spwhitton@spwhitton.name> writes:

> I've added actually running the commands and examining the results to
> several of the tests.  I found a way to show different output in the
> case of *| vs. | by using cl-letf to redefine some Lisp functions.

This leads to:

Test em-extpipe-test-14 condition:
    (ert-test-failed
     ((should
       (string-match-p regexp
                       (buffer-substring-no-properties ... ...)))
      :form
      (string-match-p "baz\nbar" "bazbar\n")
      :value nil))
   FAILED   6/16  em-extpipe-test-14 (0.119788 sec)


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