diff --git a/flow/flow_test.go b/flow/flow_test.go
new file mode 100644
index 00000000..a31ba67e
--- /dev/null
+++ b/flow/flow_test.go
@@ -0,0 +1,37 @@
+package flow
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestMarshall(t *testing.T) {
+	a := "json"
+	res := []byte(a)
+	m := RawMessage(a)
+
+	b, err := m.MarshalJSON()
+	if err != nil {
+		t.Errorf("Error %s", err)
+	}
+
+	if !reflect.DeepEqual(b, res) {
+		t.Errorf("Error %s", err)
+	}
+
+}
+
+func TestUnmarshall(t *testing.T) {
+	strn := "json"
+	b := []byte(strn)
+	// exp := string(b)
+	m := RawMessage(b)
+
+	if err := m.UnmarshalJSON(b); err != nil {
+		t.Errorf("Error %s", m)
+	}
+
+	if string(m) != strn {
+		t.Errorf("Error %s", m)
+	}
+}