unittesting generic functions

[Andrei Alexandrescu via Digitalmars-d]

On 8/14/14, 7:46 PM, H. S. Teoh via Digitalmars-d wrote:
> On Thu, Aug 14, 2014 at 05:49:39PM -0700, Andrei Alexandrescu via Digitalmars-d wrote:
>> On 8/14/14, 3:34 PM, H. S. Teoh via Digitalmars-d wrote:
>>> How does this relate to writing generic unittests? Since the incoming
>>> types are generic, you can't assume anything about them beyond what
>>> the function itself already assumes, so how would the unittest test
>>> anything beyond what the function already does?
>>
>> Check the workings of the function via an alternate algorithm for
>> example.  There's plenty of examples, including unittests inside a
>> parameterized struct/class test methods within that class.
>
> Can you give a concrete example?

For all integrals converting some value to a string and back should 
yield the same value.

Accelerated searches in any sorted ranges should provide the same result 
as linear searches.

Sorting should provide sorted results.

...


Andrei