diff --git a/tests/core/test_datatypes.py b/tests/core/test_datatypes.py
index 722a0ac4..c33da477 100644
--- a/tests/core/test_datatypes.py
+++ b/tests/core/test_datatypes.py
@@ -126,7 +126,7 @@ def test_resolve_datatype(input):
         except TypeError:
             pass
         else:
-            print("Test with invalid input failed: No TypeError was raised.")
+            assert False, "Test with invalid input failed: No TypeError was raised."
 
     test_resolve_datatype(123)
     test_resolve_datatype(1.23)