Fix calculate_age_at_registration

src/hope/apps/utils/age_at_registration.py

@@ -1,14 +1,18 @@
-from typing import Any
+from datetime import datetime
 
 from dateutil import parser
 from dateutil.relativedelta import relativedelta
 
 
 def calculate_age_at_registration(
-    created_at: Any,
+    created_at: datetime,
     birth_date: str,
 ) -> int | None:
     try:
-        return relativedelta(created_at.date(), parser.parse(birth_date).date()).years
+        calculated_age_years = relativedelta(created_at.date(), parser.parse(birth_date).date()).years
+        # return None if age is less then 0
+        if calculated_age_years < 0:
+            return None
+        return calculated_age_years
     except ValueError:
         return None

tests/unit/apps/utils/test_age_at_registration.py

@@ -0,0 +1,24 @@
+from datetime import datetime
+
+from hope.apps.utils.age_at_registration import calculate_age_at_registration
+
+
+def test_calculate_age_at_registration_value_error() -> None:
+    result = calculate_age_at_registration(datetime(2026, 10, 10), "ValueErrorHere")
+    assert result is None
+
+
+def test_calculate_age_at_registration_future_birthday() -> None:
+    # birthdate in future
+    result = calculate_age_at_registration(datetime(2026, 10, 10), "9999-10-10")
+    assert result is None
+
+
+def test_calculate_age_at_registration_zero() -> None:
+    result = calculate_age_at_registration(datetime(2023, 12, 12), "2023-12-12")
+    assert result == 0
+
+
+def test_calculate_age_at_registration() -> None:
+    result = calculate_age_at_registration(datetime(2025, 10, 10), "2000-10-10")
+    assert result == 25