public void Claim()
{
var arg = new Arg(optTable.GetOption(1), "opt1=", 0, "value1");
arg.Claim();
Assert.True(arg.IsClaimed);
Assert.Equal(0, arg.Index);
Assert.Equal("opt1=", arg.Spelling);
Assert.Equal("value1", arg.Value);
Assert.Equal(new[] { "value1" }, arg.Values.AsEnumerable());
}