### Question:
IF_NOP extends ISOFieldPackager { public byte[] pack (ISOComponent c) { return new byte[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 testPack() throws Exception { ISOField field = new ISOField(12, "ABCD"); IF_NOP packager = new IF_NOP(); assertTrue(packager.pack(field).length == 0); }