diff --git a/cmd/digest.go b/cmd/digest.go
index 9c185b2..49d68d6 100644
--- a/cmd/digest.go
+++ b/cmd/digest.go
@@ -50,7 +50,7 @@ func runDigest() {
 		Writer:       config.GetWriter(),
 	}
 
-	err := digest.DigestForFile(digestConfig)
+	_, err := digest.Create(digestConfig)
 	if err != nil {
 		log.Fatal(err)
 	}
diff --git a/pkg/digest/digest.go b/pkg/digest/digest.go
index 59b13e6..3bb3cb9 100644
--- a/pkg/digest/digest.go
+++ b/pkg/digest/digest.go
@@ -38,7 +38,7 @@ type DigestConfig struct {
 	Writer       io.Writer
 }
 
-func DigestForFile(config DigestConfig) error {
+func Create(config DigestConfig) (map[uint64]uint64, error) {
 	reader := csv.NewReader(config.Reader)
 
 	output := make(map[uint64]uint64)
@@ -48,12 +48,12 @@ func DigestForFile(config DigestConfig) error {
 			if err == io.EOF {
 				break
 			}
-			return err
+			return nil, err
 		}
 		digest := CreateDigest(line, config.KeyPositions)
 		output[digest.Key] = digest.Value
 	}
 
-	config.Encoder.Encode(output, config.Writer)
-	return nil
+	// config.Encoder.Encode(output, config.Writer)
+	return output, nil
 }
diff --git a/pkg/digest/digest_test.go b/pkg/digest/digest_test.go
index 1a8dbb1..8530098 100644
--- a/pkg/digest/digest_test.go
+++ b/pkg/digest/digest_test.go
@@ -2,7 +2,6 @@ package digest
 
 import (
 	"bytes"
-	"fmt"
 	"strings"
 	"testing"
 
@@ -41,10 +40,12 @@ func TestDigestForFile(t *testing.T) {
 		KeyPositions: []int{0},
 	}
 
-	err := DigestForFile(testConfig)
+	actualDigest, err := Create(testConfig)
 
-	actualDigest := outputBuffer.String()
-	expectedDigest := fmt.Sprintf(`{"%d":%d,"%d":%d}`, firstKey, firstDigest, secondKey, secondDigest)
+	//actualDigest := outputBuffer.String()
+	//expectedDigest := fmt.Sprintf(`{"%d":%d,"%d":%d}`, firstKey, firstDigest, secondKey, secondDigest)
+
+	expectedDigest := map[uint64]uint64{firstKey: firstDigest, secondKey: secondDigest}
 
 	assert.Nil(t, err, "error at DigestForFile")
 	assert.Equal(t, expectedDigest, actualDigest)