FastStringBuffer buf = new FastStringBuffer();
assertEquals(6, parsing.getFullFlattenedLine(0, buf.clear()));
assertEquals('c', str.charAt(6));
assertEquals("line ", buf.toString());
parsing.getFullFlattenedLine(1, buf.clear());
assertEquals("ine ", buf.toString());
assertEquals(23, parsing.getFullFlattenedLine(8, buf.clear()));
assertEquals('0', str.charAt(23));
assertEquals("start =10 30", buf.toString());