Support multiple laytime start candidates

modules/purchase_trade/tests/test_module.py

@@ -1502,6 +1502,38 @@ class PurchaseTradeTestCase(ModuleTestCase):
             sof._applied_laytime_start(),
             datetime.datetime(2026, 6, 1, 8, 0))
 
+    @with_transaction()
+    def test_sof_laytime_start_uses_earliest_candidate(self):
+        'sof laytime start can use the earliest of multiple candidates'
+        Sof = Pool().get('sof.statement')
+        sof = Sof()
+        sof.applied_condition = SimpleNamespace(
+            laytime_start_rule='earliest_of',
+            laytime_start_rules=[
+                SimpleNamespace(
+                    sequence=10,
+                    event='notice_of_readiness',
+                    offset=Decimal('6'),
+                    offset_unit='hours'),
+                SimpleNamespace(
+                    sequence=20,
+                    event='all_fast',
+                    offset=None,
+                    offset_unit='hours'),
+                ])
+        sof.notice_of_readiness_time = datetime.datetime(2026, 6, 1, 2, 0)
+        sof.all_fast = datetime.datetime(2026, 6, 1, 7, 0)
+
+        self.assertEqual(
+            sof._applied_laytime_start(),
+            datetime.datetime(2026, 6, 1, 7, 0))
+        self.assertEqual(
+            sof.get_calculation_info('calculation_start_event'),
+            'Earliest Of')
+        self.assertEqual(
+            sof.get_calculation_info('calculation_start_offset'),
+            'Notice of Readiness + 6 hours; All Fast')
+
     @with_transaction()
     def test_sof_laytime_end_reads_structured_condition_rule(self):
         'sof laytime end reads the structured end event'
@@ -1593,11 +1625,16 @@ class PurchaseTradeTestCase(ModuleTestCase):
         values = Sof._sync_datetime_values({
             'notice_of_readiness_date': datetime.date(2026, 7, 6),
             'notice_of_readiness_hour': datetime.time(8, 0),
+            'all_fast_date': datetime.date(2026, 7, 6),
+            'all_fast_hour': datetime.time(10, 30),
         })
 
         self.assertEqual(
             values['notice_of_readiness_time'],
             datetime.datetime(2026, 7, 6, 8, 0))
+        self.assertEqual(
+            values['all_fast'],
+            datetime.datetime(2026, 7, 6, 10, 30))
 
     @with_transaction()
     def test_sof_event_date_time_values_sync_to_datetime(self):