### Question:
IF_NOP extends ISOFieldPackager { public int unpack (ISOComponent c, byte[] b, int offset) { return 0; } IF_NOP();  IF_NOP(int len, String description); byte[] pack(ISOComponent c); int unpack(ISOComponent c, byte[] b, int offset); int getMaxPackedLength();  }### Answer:
@Test public void testUnpack() throws Exception { byte[] raw = new byte[]{}; IF_NOP packager = new IF_NOP(); ISOField field = new ISOField(12); assertEquals(0, packager.unpack(field, raw, 0)); assertNull(field.getValue()); }