feat: full NFSv4.2 server and client in pure Go

Assisted-by: GLM 5.3 Flash

internal/nfs4/lock_test.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: MIT
+
+package nfs4
+
+import (
+	"testing"
+
+	"sourcedock.dev/petrbalvin/nfs/internal/xdr"
+)
+
+func TestLockuAndLocktResWire(t *testing.T) {
+	var st Stateid
+	st[4], st[5], st[6], st[7] = 'L', 'O', 'C', 'K'
+	arg := AppendLockuArgs(nil, st, 8, 32)
+	d := xdr.NewDecoder(arg)
+	if op, err := d.Uint32(); err != nil || op != OpLocku {
+		t.Fatalf("op: %d, %v", op, err)
+	}
+	if lt, err := d.Uint32(); err != nil || lt != LockTypeWrite {
+		t.Fatalf("locktype: %v", err)
+	}
+	if _, err := d.Uint32(); err != nil {
+		t.Fatal(err)
+	}
+	if raw, err := d.Raw(16); err != nil || raw[4] != 'L' {
+		t.Fatalf("stateid: %x, %v", raw, err)
+	}
+	if off, err := d.Uint64(); err != nil || off != 8 {
+		t.Fatalf("offset: %v", err)
+	}
+	if length, err := d.Uint64(); err != nil || length != 32 {
+		t.Fatalf("length: %v", err)
+	}
+
+	res := AppendLockuRes(nil, st)
+	if n, err := resBodyLen(OpLocku, ErrOK, res); err != nil || n != 16 {
+		t.Fatalf("locku measure: %d, %v", n, err)
+	}
+
+	okBody := AppendLocktResOK(nil)
+	if n, err := resBodyLen(OpLockt, ErrOK, okBody); err != nil || n != 0 {
+		t.Fatalf("lockt ok measure: %d, %v", n, err)
+	}
+	denied := AppendLocktResDenied(nil, 0, 100, LockTypeWrite, 0x1111, []byte("holder"))
+	if n, err := resBodyLen(OpLockt, ErrDenied, denied); err != nil || n != len(denied) {
+		t.Fatalf("lockt denied measure: %d of %d, %v", n, len(denied), err)
+	}
+}