Unit tests called multiple times?

[Steven Schveighoffer]

On Fri, 12 Apr 2013 18:52:50 -0400, William <squidkidsignup at gmail.com>  
wrote:

> I'm compiling a medium-sized project written in D with the -unittests  
> flag.  I have some writeln statements in my unit tests, for debug  
> purposes, and I've noticed that certain unit tests are being run more  
> than once.  Sample output is along these lines:
>
> DEBUG: unit test started...
> DEBUG: loop found whatever
> DEBUG: iteration successful
> DEBUG: bar is equal to bar
> DEBUG: unit test passed...
> DEBUG: unit test started...
> DEBUG: loop found whatever
> DEBUG: iteration successful
> DEBUG: bar is equal to bar
> DEBUG: unit test passed...
> DEBUG: unit test started...
> DEBUG: loop found whatever
> DEBUG: iteration successful
> DEBUG: bar is equal to bar
> DEBUG: unit test passed...
>
> is this standard behavior for DMD?  Is it documented anywhere?  It's not  
> much of a problem, but it strikes me as rather odd, and makes the debug  
> output difficult to read.

Are your unit tests inside templates?  If so, they are instantiated once  
per template.  To fix, move outside the template.

This actually can be a nice feature, and at the same time horrible.  It's  
nice because you can parameterize your unit tests!  It's horrible because  
you have to be careful your unit tests are valid for all possible  
instantiations!

-Steve