oleaut32/tests: added tests for negative fractional variant dates.

[Jeremy Drake]

On Sat, 2 Oct 2010, James McKenzie wrote:

> Looks like you got 'bit' by the way that a finite storage method mangles
> floating information.  There was a lengthy discussion on how to 'overcome'
> this on the Wine-Development list a short while ago.

No, those tests aleady account for that.

/* When comparing floating point values we cannot expect an exact match
 * because the rounding errors depend on the exact algorithm.
 */
#define EQ_DOUBLE(a,b)     (fabs((a)-(b)) / (1.0+fabs(a)+fabs(b)) < 1e-14)
#define EQ_FLOAT(a,b)      (fabs((a)-(b)) / (1.0+fabs(a)+fabs(b)) < 1e-7)

    ok_(__FILE__,line)(r == res && (FAILED(r) || EQ_DOUBLE(out, dt)),
                       "expected %x, %.16g, got %x, %.16g\n", r, dt, res,
out);


My understanding is that that algorithm should work to account for
floating-point inaccuracies (though technically should be using
DBL_EPSILON and FLT_EPSILON instead of 1e-X constants, but they're
probably not portable enough for this project),

I was simply bit by my own stupidity, not running my last changes against
a Windows OS before sending my patch.  This has been corrected in my try2.

> Maybe Dan Kegel can step in and refresh this.
>
> James McKenzie
>


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