diff --git a/src/zcl_excel_worksheet.clas.xml b/src/zcl_excel_worksheet.clas.xml
index 41069c3..be54bec 100644
--- a/src/zcl_excel_worksheet.clas.xml
+++ b/src/zcl_excel_worksheet.clas.xml
@@ -12,6 +12,7 @@
     <CLSCCINCL>X</CLSCCINCL>
     <FIXPT>X</FIXPT>
     <UNICODE>X</UNICODE>
+    <WITH_UNIT_TESTS>X</WITH_UNIT_TESTS>
    </VSEOCLASS>
    <TPOOL>
     <item>