Actually, you get (or are supposed to get) the single-slit diffraction
pattern, which still depends on the wavelike behavior of light. More precisely, you get two such patterns, one from each slit, superimposed on each other. But the spacing between the slits is normally much smaller than the "width" of the single-slit pattern from each slit, so the two patterns almost coincide.
(I don't have any references to experimental evidence at hand. I just wanted to clear up what would be expected.)