d3dx9_36 [try 3]: Add a few tests for D3DXCreateBox

[Matteo Bruni]

Most of the objections from the previous try still stand: check your
whitespaces (whitespace after every comma, whitespaces around
operators, whitespace after "if" or "for" keywords), you have to be
consistent. Comparing indices doesn't make much sense now that you
don't check vertices, I think you should drop that too.
You could probably instead check for min and max x, y and z vertices
coordinates, verifying that the box has the expected dimensions.