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Based on the PNGsuite.
(text copied from the official PNGsuite homepage)

These tests are there to check if your software handles pictures well, with less obvious picture sizes. This is particularly important with Adam-7 type interlacing. In the same way these tests check if pictures size 1 x 1 and similar are ok.

The three rows of images must look identical. If they do not, your software does not handle odd sizes very well. The top row is the reference snapshot. The second row are non-interlaced and the third row interlaced samples.

PNGSxxxx.mng

The following images were used (left to right):

(second row)
s01n3p01 - 1x1 paletted file, no interlacing
s02n3p01 - 2x2 paletted file, no interlacing
s03n3p01 - 3x3 paletted file, no interlacing
s04n3p01 - 4x4 paletted file, no interlacing
s05n3p02 - 5x5 paletted file, no interlacing
s06n3p02 - 6x6 paletted file, no interlacing
s07n3p02 - 7x7 paletted file, no interlacing
s08n3p02 - 8x8 paletted file, no interlacing
s09n3p02 - 9x9 paletted file, no interlacing
s32n3p04 - 32x32 paletted file, no interlacing
s33n3p04 - 33x33 paletted file, no interlacing
s34n3p04 - 34x34 paletted file, no interlacing
s35n3p04 - 35x35 paletted file, no interlacing
s36n3p04 - 36x36 paletted file, no interlacing
s37n3p04 - 37x37 paletted file, no interlacing
s38n3p04 - 38x38 paletted file, no interlacing
s39n3p04 - 39x39 paletted file, no interlacing
s40n3p04 - 40x40 paletted file, no interlacing

(third row)
s01i3p01 - 1x1 paletted file, interlaced
s02i3p01 - 2x2 paletted file, interlaced
s03i3p01 - 3x3 paletted file, interlaced
s04i3p01 - 4x4 paletted file, interlaced
s05i3p02 - 5x5 paletted file, interlaced
s06i3p02 - 6x6 paletted file, interlaced
s07i3p02 - 7x7 paletted file, interlaced
s08i3p02 - 8x8 paletted file, interlaced
s09i3p02 - 9x9 paletted file, interlaced
s32i3p04 - 32x32 paletted file, interlaced
s33i3p04 - 33x33 paletted file, interlaced
s34i3p04 - 34x34 paletted file, interlaced
s35i3p04 - 35x35 paletted file, interlaced
s36i3p04 - 36x36 paletted file, interlaced
s37i3p04 - 37x37 paletted file, interlaced
s38i3p04 - 38x38 paletted file, interlaced
s39i3p04 - 39x39 paletted file, interlaced
s40i3p04 - 40x40 paletted file, interlaced

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