diff --git a/src/test/java/com/exasol/adapter/document/files/Helperfunctions.java b/src/test/java/com/exasol/adapter/document/files/Helperfunctions.java
index ba893fe..df470c7 100644
--- a/src/test/java/com/exasol/adapter/document/files/Helperfunctions.java
+++ b/src/test/java/com/exasol/adapter/document/files/Helperfunctions.java
@@ -4,8 +4,8 @@
 
 import com.azure.storage.file.datalake.DataLakeFileClient;
 
-class HelperFunctions {
-    static void uploadBytes(final byte[] bytes, final DataLakeFileClient fileClient) {
+public class HelperFunctions {
+    public static void uploadBytes(final byte[] bytes, final DataLakeFileClient fileClient) {
         final InputStream targetStream = new BufferedInputStream(new ByteArrayInputStream(bytes));
         final long fileSize = bytes.length;
         fileClient.upload(targetStream, fileSize, false);