test: Adjust test as per teardown

- make tests use multi level bom in WO, as BOM at setup is used
- earlier, an intermediate BOM made in a test would override the BOM at setup

erpnext/manufacturing/doctype/production_plan/test_production_plan.py

@@ -154,7 +154,7 @@ class TestProductionPlan(FrappeTestCase):
 			use_multi_level_bom=0,
 			ignore_existing_ordered_qty=0
 		)
-		self.assertTrue(len(pln.mr_items), 0)
+		self.assertTrue(len(pln.mr_items))
 
 		sr1.cancel()
 		sr2.cancel()
@@ -575,6 +575,7 @@ class TestProductionPlan(FrappeTestCase):
 			wip_warehouse='Work In Progress - _TC',
 			fg_warehouse='Finished Goods - _TC',
 			skip_transfer=1,
+			use_multi_level_bom=1,
 			do_not_submit=True
 		)
 		wo.production_plan = pln.name
@@ -619,6 +620,7 @@ class TestProductionPlan(FrappeTestCase):
 			wip_warehouse='Work In Progress - _TC',
 			fg_warehouse='Finished Goods - _TC',
 			skip_transfer=1,
+			use_multi_level_bom=1,
 			do_not_submit=True
 		)
 		wo.production_plan = pln.name

erpnext/manufacturing/doctype/work_order/test_work_order.py

@@ -1040,7 +1040,7 @@ def make_wo_order_test_record(**args):
 	wo_order.scrap_warehouse = args.fg_warehouse or "_Test Scrap Warehouse - _TC"
 	wo_order.company = args.company or "_Test Company"
 	wo_order.stock_uom = args.stock_uom or "_Test UOM"
-	wo_order.use_multi_level_bom=0
+	wo_order.use_multi_level_bom= args.use_multi_level_bom or 0
 	wo_order.skip_transfer=args.skip_transfer or 0
 	wo_order.get_items_and_operations_from_bom()
 	wo_order.sales_order = args.sales_order or None