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| From | Don Y <this@isnotme.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Regression testing for pointers |
| Date | 2012-03-09 19:40 -0700 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <jjeevo$b0n$1@speranza.aioe.org> (permalink) |
| References | <jje4jg$l8k$1@speranza.aioe.org> <9rvjl6Ftf6U2@mid.individual.net> |
Hi Ian,
On 3/9/2012 4:56 PM, Ian Collins wrote:
>> There's rarely a problem generating regression tests for
>> functions/procedures that use concrete *values*:
>>
>> sqrt.test
>>
>> 3 --> 1.732
>> 4 --> 2
>> 5 --> 2.236
>>
>> (apologies if I have misremembered any of these values :> )
>>
>> And, it is easy to erect the necessary scaffolding for those
>> sorts of tests without introducing any noticeable uncertainty
>> in the veracity of the results obtained.
>>
>> But, I can't see a way to handle this sort of testing on
>> functions that manipulate *pointers* to objects -- without
>> adding a fair bit of code to the scaffolding that, itself,
>> represents a testing issue! (i.e., does the scaffolding
>> have any bugs that result in false positives or negatives??)
>
> As a general point, it a lot easier and more satisfying for the
> programmer to write the tests before the code under test.
But that's the whole point -- you can't create test cases
independant of the execution environment!
What should "malloc(500)" return? 0x1234? 0x12345678?
NULL?
>> In particular, I am trying to develop a test suite for my
>> dynamic memory management functions (e.g., malloc and free
>> types of routines).
>>
>> I.e., I can't come up with "constant" results against
>> which to compare test-time results. Sticking with the
>> traditional malloc/free for example (my routines are
>> more heavily parameterized), I can create a malloc.test
>> that pushes size_t's to malloc. But, aside from verifying
>> the result is not NULL (or, *is* NULL, in some cases!),
>> there's nothing I can do to check that the result is
>> actually correct!
>
> Mock the functions your code calls.
>
> I have a mocking library that can be used to mock any C function (given
> its return and parameter types) for use in unit tests which enables me
> to specify expected parameters and returned results. I find this
> invaluable for comprehensive uni testing.
I don't see how that will help me. Malloc doesn't "call* anything.
It massages blocks of memory in ways that vary depending on the
platform involved, etc.
E.g.,
foo = malloc(500);
result = myfree(foo, 451);
can work on some platforms and not on others; and, among
those where it does work, can give different results from
platform to platform.
The problem becomes even more difficult when you start
varying allocation strategies, fragmentation criteria, etc.
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Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-09 16:43 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-10 12:56 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-09 19:40 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-10 17:53 +1300
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-10 18:12 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-10 02:05 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-10 23:17 +1300
Re: Regression testing for pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-10 12:00 +0000
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-11 11:00 +1300
Re: Regression testing for pointers Ike Naar <ike@iceland.freeshell.org> - 2012-03-10 22:23 +0000
Re: Regression testing for pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-10 22:40 +0000
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-11 12:12 +1300
Re: Regression testing for pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-11 00:42 +0000
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-11 14:26 +1300
Re: Regression testing for pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-11 03:09 +0000
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-11 18:16 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-10 12:01 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-11 10:35 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 09:19 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 07:23 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 16:23 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 17:25 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 00:19 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 20:34 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 01:00 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 21:22 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 10:19 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-14 07:25 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-14 02:00 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-14 22:18 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-14 11:32 -0700
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-15 05:58 -0700
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-15 05:55 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-15 11:32 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-16 18:14 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-20 01:43 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-20 21:59 +1300
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-16 03:05 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-20 02:33 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-24 11:49 +1300
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-11 05:01 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-11 09:44 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-12 09:56 +1300
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-10 02:28 -0800
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-10 11:09 -0700
Re: Regression testing for pointers Kaz Kylheku <kaz@kylheku.com> - 2012-03-10 18:29 +0000
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-11 05:22 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-11 09:50 -0700
Re: Regression testing for pointers "io_x" <a@b.c.invalid> - 2012-03-13 13:09 +0100
Re: Regression testing for pointers Kaz Kylheku <kaz@kylheku.com> - 2012-03-10 03:14 +0000
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-10 12:42 -0700
Re: Regression testing for pointers Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-10 08:42 +0000
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-10 02:19 -0700
Re: Regression testing for pointers "BartC" <bc@freeuk.com> - 2012-03-10 15:54 +0000
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-10 11:49 -0700
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-11 06:09 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-11 12:33 -0700
Re: Regression testing for pointers nick_keighley_nospam@hotmail.com - 2012-03-12 03:29 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 10:01 -0700
Re: Regression testing for pointers "BartC" <bc@freeuk.com> - 2012-03-13 18:56 +0000
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 16:31 -0700
Re: Regression testing for pointers Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-12 00:30 +0000
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 16:41 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-12 13:39 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 09:36 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 07:25 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 16:28 -0700
Re: Regression testing for pointers Kaz Kylheku <kaz@kylheku.com> - 2012-03-13 04:20 +0000
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 17:34 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 00:29 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 17:31 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 01:05 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-13 21:30 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-13 10:43 -0700
Re: Regression testing for pointers Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-03-10 15:41 -0800
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-11 11:23 -0700
Re: Regression testing for pointers Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-03-13 13:43 -0700
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-14 01:45 -0700
Re: Regression testing for pointers Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-03-14 15:15 -0700
Re: Regression testing for pointers Kaz Kylheku <kaz@kylheku.com> - 2012-03-14 22:57 +0000
Re: Regression testing for pointers Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-03-15 13:10 -0700
Re: Regression testing for pointers jgk@panix.com (Joe keane) - 2012-03-16 22:20 +0000
Re: Regression testing for pointers "io_x" <a@b.c.invalid> - 2012-03-18 07:15 +0100
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-14 23:13 -0700
Re: Regression testing for pointers gordonb.b29ri@burditt.org (Gordon Burditt) - 2012-03-12 19:37 -0500
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-12 19:23 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-14 13:12 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-14 01:54 -0700
Re: Regression testing for pointers Ian Collins <ian-news@hotmail.com> - 2012-03-14 22:05 +1300
Re: Regression testing for pointers Don Y <this@isnotme.com> - 2012-03-14 11:54 -0700
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