[Issue 13291] unittest should be allowed inside template functions

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13291

Steven Schveighoffer <schveiguy at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |schveiguy at yahoo.com

--- Comment #7 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Using the template instantiation to cover all unit tests is both a boon and a
curse.

I use it in dcollections to great effect, and have found several D/phobos bugs
just with that use.

However, often you do NOT want to instantiate unit tests for ALL invocations.

Consider this:

T max(T)(T x, T y)

A test for max might look like:

unittest
{
   T t1 = 0, t2 = 1, t3 = 2;
   assert(max(t1, t2) == t2);
   assert(max(t2, t1) == 1);
   assert(max(t1, t3) == t3);
   assert(max(t3, t2) == 2);

   // etc...
}

But what if T is string?

Now, you have to create a different unit test because the literals are
different. Unit tests require both input and results, and the input isn't
always easy to determine for any generic type.

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