diff --git a/lib/src/test/org/kiwix/test/libzim/TestBlob.java b/lib/src/test/org/kiwix/test/libzim/TestBlob.java
new file mode 100644
index 0000000..afbe604
--- /dev/null
+++ b/lib/src/test/org/kiwix/test/libzim/TestBlob.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2022 Matthieu Gautier <mgautier@kymeria.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU  General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+package org.kiwix.test.libzim;
+
+import org.kiwix.libzim.Blob;
+
+public class TestBlob
+{
+  private Blob inner;
+  TestBlob(Blob _inner) { inner = _inner; }
+  public byte[] getData() { return inner.getData(); }
+  public long size() { return inner.size(); }
+}
diff --git a/lib/src/test/org/kiwix/test/libzim/TestItem.java b/lib/src/test/org/kiwix/test/libzim/TestItem.java
index 6928651..790e457 100644
--- a/lib/src/test/org/kiwix/test/libzim/TestItem.java
+++ b/lib/src/test/org/kiwix/test/libzim/TestItem.java
@@ -20,7 +20,6 @@
 package org.kiwix.test.libzim;
 
 import org.kiwix.libzim.Item;
-import org.kiwix.libzim.Blob;
 import org.kiwix.libzim.DirectAccessInfo;
 
 public class TestItem
@@ -31,7 +30,7 @@ public class TestItem
   public String getPath() { return inner.getPath(); }
   public String getMimetype() { return inner.getMimetype(); }
 
-  public Blob getData() { return inner.getData(); }
+  public TestBlob getData() { return new TestBlob(inner.getData()); }
   public long getSize() { return inner.getSize(); }
 
   public DirectAccessInfo getDirectAccessInformation() { return inner.getDirectAccessInformation(); }