public void TestSimpleFieldSetter()
{
IsoMessage iso = mf.NewMessage(0x200);
IsoValue f3 = iso.GetField(3);
iso.UpdateValue(3, "999999");
Assert.Equal("999999", iso.GetObjectValue(3));
IsoValue nf3 = iso.GetField(3);
Assert.NotSame(f3, nf3);
Assert.Equal(f3.Type, nf3.Type);
Assert.Equal(f3.Length, nf3.Length);
Assert.Same(f3.Encoder, nf3.Encoder);
Assert.Throws <ArgumentException>(() => iso.UpdateValue(4, "INVALID!"))
;
}