help-gnu-emacs
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: ERT: should-error doesn't catch failed assertions


From: Emanuel Berg
Subject: Re: ERT: should-error doesn't catch failed assertions
Date: Mon, 18 Jul 2016 00:57:41 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux)

Sean McAfee <address@hidden> writes:

> (should-error (cl-assert nil))

What is "should-error"?

> (def my-checksum (str) (cl-assert (= 5 (length
> str))) ; ... )

With `defun' instead of "def", your code works:

    (require 'cl-lib)
    (defun my-checksum (str)
      (cl-assert (= 5 (length str)))
      )

    (my-checksum "abcdfg") ; error
    (my-checksum "abcdf")  ; nil
    (my-checksum "abcd")   ; error

Unit testing and input verification isn't
necessary but can be helpful.

In this case you can have an ordinary `if' form
with an `error' if the string length is
inconsistent with the the purpose of
the function.

Also, `condition-case' may be useful if you
don't know about it already.

Here is an article about testing - it should be
done, but not overemphasized. The best method
of testing is to have a lot of people using
your software. The second best method is for
you to use the system a lot. I guess the
various methods proposed are a distant third...

    http://user.it.uu.se/~embe8573/testing.txt

-- 
underground experts united .... http://user.it.uu.se/~embe8573
Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic
                   - so far: 58 Blogomatic articles -                   


reply via email to

[Prev in Thread] Current Thread [Next in Thread]