The font for this test case is FDArray Test 257, a test font by Adobe. The font has been engineered by Ken Lunde to use a CFF font dictionary array for mapping Unicode codepoints to glyphs. If your implementation is correct, each rendered glyph should show a hexadecimal number with the least significant byte of the Unicode codepoint being rendered. For a more detailed explanation of this test, please refer to Adobe’s description.