diff --git a/ostap/fitting/tests/test_fitting_dataset.py b/ostap/fitting/tests/test_fitting_dataset.py
index f519c58d..b43a500b 100644
--- a/ostap/fitting/tests/test_fitting_dataset.py
+++ b/ostap/fitting/tests/test_fitting_dataset.py
@@ -97,6 +97,10 @@
 logger.info ( 'Print small   unweighted dataset:\n%s' % ws1.table ( prefix = '# ' ) )
 logger.info ( 'Print small     weighted dataset:\n%s' % ws1.table ( prefix = '# ' ) )
 
+
+
+raise RuntimeError ( 'QUQU!' )
+
 # =============================================================================
 ## (5) subset/sample (unique) 
 # =============================================================================