Unit test practices in Phobos

[Daniel Keep]

Lars T. Kyllingstad wrote:
> ...

Knocked this up in about two minutes.  Might be handy.

template TestInstantiateImpl(alias Tmpl, Ts...)
{
    static if( Ts.length > 0 )
    {
        alias Tmpl!(Ts[0]) test;
        alias TestInstantiateImpl!(Tmpl, Ts[1..$]).next next;
    }
    else
    {
        enum next = true;
    }
}

template TestInstantiate(alias Tmpl, Ts...)
{
    alias TestInstantiateImpl!(Tmpl, Ts).next TestInstantiate;
}

template Blah(T)
{
    pragma(msg, "Blah!("~T.stringof~")");
    alias T Blah;
}

T nanFor(T)()
{
    pragma(msg, "nanFor!("~T.stringof~")");
    return T.nan;
}

unittest
{
    static assert( TestInstantiate!(Blah, float, double, real) );
    static assert( TestInstantiate!(nanFor, float, double, real) );

    static assert( TestInstantiate!(Blah, int) );
    static assert( TestInstantiate!(nanFor, int) );
}

void main()
{
}

$ dmd -unittest irc
Blah!(float)
Blah!(double)
Blah!(real)
nanFor!(float)
nanFor!(double)
nanFor!(real)
Blah!(int)
nanFor!(int)
irc.d(34): Error: no property 'nan' for type 'int'
irc.d(43): Error: template instance irc.TestInstantiate!(nanFor,int)
error instantiating