GlyphSequence tigs = tf.mapCharsToGlyphs ( wf );
                assertSameGlyphs ( iga, getGlyphs ( tigs ), "input glyphs", wf, tfn );
                GlyphSequence togs = gsub.substitute ( tigs, script, language );
                assertSameGlyphs ( oga, getGlyphs ( togs ), "output glyphs", wf, tfn );
                int[][] tpaa = new int [ togs.getGlyphCount() ] [ 4 ];
                if ( gpos.position ( togs, script, language, 1000, widths, tpaa ) ) {
                    assertSameAdjustments ( paa, tpaa, wf, tfn );
                } else if ( paa != null ) {
                    assertEquals ( "unequal adjustment count, word form(" + wf + "), font (" + tfn + ")", paa.length, 0 );
                }
            }