Re: Graphic assertions?

avinap77 wrote:

> Thanks, I'll look it up, although it looks like not quite what I need.
>
> p.s. most of my graphics TDD work so far has been mainly image
> manipulation (for instance resizing an image, cropping, etc.) and
> there was no problem TDDing this - I simply make an in-memory bitmap
> as an input, let the image processor do it's stuff and then assert on
> the output (all in memory, no file I/O required).

Can you do that "first"? Can you write a failing test that forces you
to upgrade the code to pass the test the correct way?

> I ended up with
> things like AssertPixelColorsAreSame(expectedColor, actualColor) and
> at some point even an AssertImagesLookAlike that compared an original
> bitmap and a resized bitmat to see if they, umm, look alike. But
> these assertions were only good for simplistic input cases (like
> resizing a half-red/half blue bitmat and asserting that the resized
> bitmap was also half red/half blue), and sometimes I had to add some
> flexibility to them (such as compensating for color distortions when
> converting a bitmap to JPEG).

One JB Rainsberger calls that a "Gold Master Copy" test.

-- 
  Phlip
  http://c2.com/cgi/wiki?ZeekLand  <-- NOT a blog!!


 
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