diff --git a/server-application-server/source/java/ch/ethz/sis/openbis/generic/server/xls/importer/utils/FileServerUtils.java b/server-application-server/source/java/ch/ethz/sis/openbis/generic/server/xls/importer/utils/FileServerUtils.java
index 1784e017998e7d0eb02f505e53c6621aad5c63a3..e8f8b280404a50993ba94c981ba9ad3ea380e1df 100644
--- a/server-application-server/source/java/ch/ethz/sis/openbis/generic/server/xls/importer/utils/FileServerUtils.java
+++ b/server-application-server/source/java/ch/ethz/sis/openbis/generic/server/xls/importer/utils/FileServerUtils.java
@@ -7,12 +7,23 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.Set;
 
 public class FileServerUtils
 {
+
+    /** These files are used for testing purposes and should be treated separately. */
+    private static final Set<String> TEST_FILE_PATHS = Set.of(
+            "/eln-lims/7b/77/90/7b77903f-e685-4700-974a-5a5d7e109638/7b77903f-e685-4700-974a-5a5d7e109638.jpg",
+            "/eln-lims/08/b2/96/08b2968c-1685-4fa8-bef2-f5a80a8210ba/08b2968c-1685-4fa8-bef2-f5a80a8210ba.jpg",
+            "/eln-lims/46/63/05/466305f0-4842-441f-b21c-777ea82079b4/466305f0-4842-441f-b21c-777ea82079b4.jpg",
+            "/eln-lims/c0/1b/2e/c01b2e1f-8212-4562-ae8a-9072bf92e687/c01b2e1f-8212-4562-ae8a-9072bf92e687.jpg",
+            "/eln-lims/c1/b2/91/c1b2912a-2ed6-40d6-8d9f-8c3ec2b29c5c/c1b2912a-2ed6-40d6-8d9f-8c3ec2b29c5c.jpg",
+            "/eln-lims/f3/e4/0c/f3e40c2e-109c-4191-bed0-2cf931de185a/f3e40c2e-109c-4191-bed0-2cf931de185a.jpg");
+
     private static Path getFilePath(String filePath) throws IOException
     {
-        if (CommonServiceProvider.getApplicationContext() != null)
+        if (!TEST_FILE_PATHS.contains(filePath))
         {
             // Runtime mode.
             String repositoryPathAsString = CommonServiceProvider.tryToGetProperty(
@@ -31,7 +42,7 @@ public class FileServerUtils
         {
             // Testing mode.
 
-            // Return some default testing path.
+            // Return the default testing path.
             return Path.of(new File("./sourceTest/java/ch/ethz/sis/openbis/generic/server/xls/importer/utils/" + filePath).getCanonicalPath());
         }
     }