diff --git a/core/module_featurees_uploader_test.go b/core/module_featurees_uploader_test.go
new file mode 100644
index 0000000..e9587cd
--- /dev/null
+++ b/core/module_featurees_uploader_test.go
@@ -0,0 +1,99 @@
+package core
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"testing"
+
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/op/go-logging"
+	"github.com/stretchr/testify/suite"
+	"golang.org/x/text/language"
+
+	"github.com/retailcrm/mg-transport-core/v2/core/config"
+	"github.com/retailcrm/mg-transport-core/v2/core/logger"
+)
+
+type ModuleFeaturesUploaderTest struct {
+	suite.Suite
+	localizer LocalizerInterface
+}
+
+func TestModuleFeaturesUploader(t *testing.T) {
+	suite.Run(t, new(ModuleFeaturesUploaderTest))
+}
+
+func (t *ModuleFeaturesUploaderTest) SetupSuite() {
+	createTestLangFiles(t.T())
+	t.localizer = NewLocalizer(language.English, DefaultLocalizerMatcher(), testTranslationsDir)
+}
+
+func (t *ModuleFeaturesUploaderTest) TearDownSuite() {
+	err := os.RemoveAll(testTranslationsDir)
+	t.Require().Nil(err)
+}
+
+func (t *ModuleFeaturesUploaderTest) TestModuleFeaturesUploader_NewModuleFeaturesUploader() {
+	logs := &bytes.Buffer{}
+	log := logger.NewBase(logs, "code", logging.DEBUG, logger.DefaultLogFormatter())
+	conf := config.AWS{Bucket: "bucketName", FolderName: "folder/name"}
+
+	uploader := NewModuleFeaturesUploader(log, conf, t.localizer, "filename.txt")
+	t.Assert().NotNil(uploader)
+	t.Assert().NotNil(uploader.client)
+	t.Assert().Equal(log, uploader.log)
+	t.Assert().NotNil(uploader.loc)
+	t.Assert().Equal("bucketName", uploader.bucket)
+	t.Assert().Equal("folder/name", uploader.folder)
+}
+
+func (t *ModuleFeaturesUploaderTest) TestModuleFeaturesUploader_translate() {
+	logs := &bytes.Buffer{}
+	log := logger.NewBase(logs, "code", logging.DEBUG, logger.DefaultLogFormatter())
+	conf := config.AWS{Bucket: "bucketName", FolderName: "folder/name"}
+	uploader := NewModuleFeaturesUploader(log, conf, t.localizer, "filename.txt")
+	content := "test content " + t.localizer.GetLocalizedMessage("message")
+
+	res, err := uploader.translate([]byte(content), language.Russian)
+	t.Assert().Nil(err)
+	t.Assert().Equal([]byte("test content Test message"), res)
+}
+
+func (t *ModuleFeaturesUploaderTest) TestModuleFeaturesUploader_uploadFile() {
+	logs := &bytes.Buffer{}
+	log := logger.NewBase(logs, "code", logging.DEBUG, logger.DefaultLogFormatter())
+	conf := config.AWS{Bucket: "bucketName", FolderName: "folder/name"}
+	uploader := NewModuleFeaturesUploader(log, conf, t.localizer, "source.md")
+	content := "test content"
+
+	uploader.client = mockPutObjectAPI(t.T(), "bucketName", "folder/name/filename.html")
+	err := uploader.uploadFile([]byte(content), "filename")
+	t.Assert().Nil(err)
+}
+
+type putObjectAPI func(ctx context.Context, params *s3.PutObjectInput, optFns ...func(*s3.Options)) (*s3.PutObjectOutput, error)
+
+func (m putObjectAPI) PutObject(ctx context.Context, params *s3.PutObjectInput, optFns ...func(*s3.Options)) (*s3.PutObjectOutput, error) {
+	return m(ctx, params, optFns...)
+}
+
+func mockPutObjectAPI(t *testing.T, bucket, key string) S3PutObjectAPI {
+	return putObjectAPI(func(ctx context.Context, params *s3.PutObjectInput, optFns ...func(*s3.Options)) (*s3.PutObjectOutput, error) {
+		t.Helper()
+		if params.Bucket == nil {
+			t.Fatal("expect bucket to not be nil")
+		}
+		if e, a := bucket, *params.Bucket; e != a {
+			t.Errorf("expect %v, got %v", e, a)
+		}
+		if params.Key == nil {
+			t.Fatal("expect key to not be nil")
+		}
+		if e, a := key, *params.Key; e != a {
+			t.Errorf("expect %v, got %v", e, a)
+		}
+
+		return &s3.PutObjectOutput{}, nil
+	})
+}
diff --git a/core/module_features_uploader.go b/core/module_features_uploader.go
index e305401..f37a2f0 100644
--- a/core/module_features_uploader.go
+++ b/core/module_features_uploader.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"fmt"
 	"html/template"
-	"io/fs"
 	"os"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
@@ -18,8 +17,12 @@ import (
 	"github.com/retailcrm/mg-transport-core/v2/core/logger"
 )
 
+type S3PutObjectAPI interface {
+	PutObject(ctx context.Context, params *s3.PutObjectInput, optFns ...func(*s3.Options)) (*s3.PutObjectOutput, error)
+}
+
 type ModuleFeaturesUploader struct {
-	client           *s3.Client
+	client           S3PutObjectAPI
 	log              logger.Logger
 	loc              LocalizerInterface
 	bucket           string
@@ -32,7 +35,7 @@ var languages = []language.Tag{language.Russian, language.English, language.Span
 func NewModuleFeaturesUploader(
 	log logger.Logger,
 	conf config.AWS,
-	translateFs fs.FS,
+	loc LocalizerInterface,
 	featuresFilename string,
 ) *ModuleFeaturesUploader {
 	customResolver := aws.EndpointResolverWithOptionsFunc(
@@ -63,7 +66,7 @@ func NewModuleFeaturesUploader(
 	return &ModuleFeaturesUploader{
 		client:           s3.NewFromConfig(cfg),
 		log:              log,
-		loc:              NewLocalizerFS(DefaultLanguage, DefaultLocalizerMatcher(), translateFs),
+		loc:              loc,
 		bucket:           conf.Bucket,
 		folder:           conf.FolderName,
 		featuresFilename: featuresFilename,