public void TestChangingArgs()
{
ResetForTesting(() => Assert.True(false, "bad parse"));
//the go src sets os.Args, which is the command line arguments, something that is read-only in .net
var args = new[] { "cmd", "-before", "subcmd", "-after", "args" };
var before = Flag.Bool("before", false, "");
var err = Flag.CommandLine.Parse(args.Skip(1).ToArray());
Assert.True(err == null, err?.ToString());
var cmd = Flag.Arg(0);
var after = Flag.Bool("after", false, "");
args = Flag.Args();
Flag.CommandLine.Parse(args.Skip(1).ToArray());
args = Flag.Args();
Assert.True(before && cmd == "subcmd" && after && args[0] == "args", $"expected true subcmd true [args] got {before} {cmd} {after} {string.Join(',', args)}");
}