### Question:
ByteConstant extends ByteFunction implements ConstantFunction { @Override public byte getByte(Record rec) { return value; } ByteConstant(int position, byte value); @Override byte getByte(Record rec);  }### Answer:
@Test public void testConstant() { ByteConstant constant = new ByteConstant(0, (byte) 45); Assert.assertTrue(constant.isConstant()); Assert.assertEquals(45, constant.getByte(null)); }