diff --git a/test/serializer-round-trip/test_conditions.py b/test/serializer-round-trip/test_conditions.py
new file mode 100644
index 0000000..c4fef7b
--- /dev/null
+++ b/test/serializer-round-trip/test_conditions.py
@@ -0,0 +1,28 @@
+# pylint: disable=invalid-name
+'''testing basic conditions compliance'''
+import datetime
+import pytest
+from pydantic import Field, ValidationError
+from rune.runtime.base_data_class import BaseDataClass
+
+
+class cdm_base_datetime_DateList(BaseDataClass):
+    """
+    List of dates.
+    """
+    _FQRTN = 'cdm.base.datetime.DateList'
+    date: list[datetime.date] = Field(..., description='', min_length=1)
+
+
+def test_min_list_length_all_defaults():
+    '''no doc'''
+    with pytest.raises(ValidationError):
+        cdm_base_datetime_DateList()
+
+
+def test_min_list_length_empty_list():
+    '''no doc'''
+    with pytest.raises(ValidationError):
+        cdm_base_datetime_DateList(date=[])
+
+# EOF