Freetype and OT font functions give different positions for some glyphs in this font (OT seems to be correct), but that is not what we are interested in in this test. See https://github.com/behdad/harfbuzz/pull/590#issuecomment-341045223.
Currently fails. https://bugzilla.gnome.org/show_bug.cgi?id=541608
For https://github.com/behdad/harfbuzz/pull/123 Currently fails. Fix coming.