add marshal test for nbt library

nbt/marshal_test.go

@@ -0,0 +1,40 @@
+package nbt
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestMarshal_IntArray(t *testing.T) {
+	// Test marshal pure Int array
+	v := []int32{0, -10, 3}
+	out := []byte{TagIntArray, 0x00, 0x00, 0, 0, 0, 3,
+		0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xf6,
+		0x00, 0x00, 0x00, 0x03,
+	}
+	var buf bytes.Buffer
+	if err := Marshal(&buf, v); err != nil {
+		t.Error(err)
+	} else if !bytes.Equal(buf.Bytes(), out) {
+		t.Errorf("output binary not right: get % 02x, want % 02x ", buf.Bytes(), out)
+	}
+
+	// Test marshal in a struct
+	v2 := struct {
+		Ary []int32 `nbt:"ary"`
+	}{[]int32{0, -10, 3}}
+	out = []byte{TagCompound, 0x00, 0x00,
+		TagIntArray, 0x00, 0x03, 'a', 'r', 'y', 0, 0, 0, 3,
+		0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xf6,
+		0x00, 0x00, 0x00, 0x03,
+		TagEnd,
+	}
+	buf.Reset()
+	if err := Marshal(&buf, v2); err != nil {
+		t.Error(err)
+	} else if !bytes.Equal(buf.Bytes(), out) {
+		t.Errorf("output binary not right: get % 02x, want % 02x ", buf.Bytes(), out)
+	}
+}