diff --git a/internal/outputter/outputter.go b/internal/outputter/outputter.go
index dc45498..ece26f0 100644
--- a/internal/outputter/outputter.go
+++ b/internal/outputter/outputter.go
@@ -28,14 +28,7 @@ func NewOutPutter(flag string) *outPutter {
 	return o
 }
 
-func (o *outPutter) MakeDir(dir string) error {
-	if _, err := os.Stat(dir); os.IsNotExist(err) {
-		return os.Mkdir(dir, 0777)
-	}
-	return nil
-}
-
-func (o *outPutter) Write(data browingdata.Source, writer *os.File) error {
+func (o *outPutter) Write(data browingdata.Source, writer io.Writer) error {
 	switch o.json {
 	case true:
 		encoder := jsoniter.NewEncoder(writer)
@@ -48,17 +41,15 @@ func (o *outPutter) Write(data browingdata.Source, writer *os.File) error {
 			writer.Comma = ','
 			return gocsv.NewSafeCSVWriter(writer)
 		})
-		return gocsv.MarshalFile(data, writer)
+		return gocsv.Marshal(data, writer)
 	}
 }
 
-func (o *outPutter) CreateFile(dirname, filename string) (*os.File, error) {
+func (o *outPutter) CreateFile(dir, filename string) (*os.File, error) {
 	if filename == "" {
 		return nil, errors.New("empty filename")
 	}
 
-	dir := filepath.Dir(filename)
-
 	if dir != "" {
 		if _, err := os.Stat(dir); os.IsNotExist(err) {
 			err := os.MkdirAll(dir, 0777)
@@ -70,7 +61,7 @@ func (o *outPutter) CreateFile(dirname, filename string) (*os.File, error) {
 
 	var file *os.File
 	var err error
-	p := filepath.Join(dirname, filename)
+	p := filepath.Join(dir, filename)
 	file, err = os.OpenFile(p, os.O_TRUNC|os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
 	if err != nil {
 		return nil, err
diff --git a/internal/outputter/outputter_test.go b/internal/outputter/outputter_test.go
new file mode 100644
index 0000000..ed37e85
--- /dev/null
+++ b/internal/outputter/outputter_test.go
@@ -0,0 +1,22 @@
+package outputter
+
+import (
+	"os"
+	"testing"
+)
+
+func TestNewOutPutter(t *testing.T) {
+	out := NewOutPutter("json")
+	if out == nil {
+		t.Error("NewOutPutter() returned nil")
+	}
+	f, err := out.CreateFile("results", "test.json")
+	if err != nil {
+		t.Error("CreateFile() returned an error", err)
+	}
+	defer os.RemoveAll("results")
+	err = out.Write(nil, f)
+	if err != nil {
+		t.Error("Write() returned an error", err)
+	}
+}