Initial certificate system

backend/tests/test_certificate_number.py

@@ -0,0 +1,15 @@
+import re
+from datetime import date
+
+from app.services.certificate_number import build_certificate_no
+
+
+def test_certificate_number_shape():
+    number = build_certificate_no(123, "dby", date(2026, 6, 1))
+    assert re.fullmatch(r"PX2026-DBY-[23456789ABCDEFGHJKLMNPQRSTUVWXYZ]{7}-[23456789ABCDEFGHJKLMNPQRSTUVWXYZ]{2}", number)
+
+
+def test_certificate_number_changes_with_sequence():
+    first = build_certificate_no(123, "DBY", date(2026, 6, 1))
+    second = build_certificate_no(124, "DBY", date(2026, 6, 1))
+    assert first != second