diff --git a/serial_test.go b/serial_test.go
new file mode 100644
index 0000000..9620d6a
--- /dev/null
+++ b/serial_test.go
@@ -0,0 +1,39 @@
+package serial
+
+import (
+	"bytes"
+	"testing"
+)
+
+type t1 struct {
+	FieldA string `json:"field_a" group:"group_1"`
+	FieldB int    `json:"field_b" group:"group_2"`
+	FieldC bool   `json:"field_c" group:"group_1"`
+	FieldD t2     `json:"field_d" group:"group_2,group_1"`
+}
+type t2 struct {
+	FieldA string  `json:"field_a" group:"group_2"`
+	FieldB int     `json:"field_b" group:"group_2,group_1"`
+	FieldC bool    `json:"field_c" group:"group_2"`
+	FieldD float64 `json:"field_d" group:"group_1"`
+}
+
+func TestSerialize(t *testing.T) {
+	o1 := t1{
+		FieldA: "foo",
+		FieldB: 123,
+		FieldC: true,
+		FieldD: t2{FieldA: "bar", FieldB: 321, FieldC: false, FieldD: 123.2121},
+	}
+	result := bytes.NewBuffer([]byte{})
+	if err := NewEncoder(result).AddGroup("group_1").Encode(o1); err != nil {
+		t.Error(err)
+	}
+	expected := `{"field_a":"foo","field_c":true,"field_d":{"field_b":321,"field_d":123.2121}}`
+	if result.String() != expected {
+		t.Errorf("Expected: %s got %s", expected, result.String())
+	}
+}
+
+func TestDeserialize(t *testing.T) {
+}