diff --git a/erpnext/buying/doctype/buying_settings/test_buying_settings.py b/erpnext/buying/doctype/buying_settings/test_buying_settings.py
index c884f51e7eb..c5ddef4fe7f 100644
--- a/erpnext/buying/doctype/buying_settings/test_buying_settings.py
+++ b/erpnext/buying/doctype/buying_settings/test_buying_settings.py
@@ -1,9 +1,30 @@
 # Copyright (c) 2019, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
-# import frappe
+
+from unittest.mock import patch
+
+import frappe
 
 from erpnext.tests.utils import ERPNextTestSuite
 
 
 class TestBuyingSettings(ERPNextTestSuite):
-	pass
+	def test_unrelated_change_does_not_update_supplier_metadata(self):
+		settings = frappe.get_single("Buying Settings")
+		settings.allow_multiple_items = not settings.allow_multiple_items
+
+		with patch("erpnext.utilities.naming.set_by_naming_series") as set_by_naming_series:
+			settings.save()
+
+		set_by_naming_series.assert_not_called()
+
+	def test_supplier_metadata_updates_when_related_settings_change(self):
+		settings = frappe.get_single("Buying Settings")
+		settings.supp_master_name = (
+			"Supplier Name" if settings.supp_master_name == "Naming Series" else "Naming Series"
+		)
+
+		with patch("erpnext.utilities.naming.set_by_naming_series") as set_by_naming_series:
+			settings.save()
+
+		set_by_naming_series.assert_called_once()
diff --git a/erpnext/selling/doctype/selling_settings/test_selling_settings.py b/erpnext/selling/doctype/selling_settings/test_selling_settings.py
index 9a839d3b2f3..6bfa45527b8 100644
--- a/erpnext/selling/doctype/selling_settings/test_selling_settings.py
+++ b/erpnext/selling/doctype/selling_settings/test_selling_settings.py
@@ -1,6 +1,8 @@
 # Copyright (c) 2019, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
 
+from unittest.mock import patch
+
 import frappe
 
 from erpnext.tests.utils import ERPNextTestSuite
@@ -12,3 +14,23 @@ class TestSellingSettings(ERPNextTestSuite):
 		# if setup was completed correctly
 		default = frappe.db.get_single_value("Selling Settings", "maintain_same_rate_action")
 		self.assertEqual("Stop", default)
+
+	def test_unrelated_change_does_not_update_customer_metadata(self):
+		settings = frappe.get_single("Selling Settings")
+		settings.allow_multiple_items = not settings.allow_multiple_items
+
+		with patch("erpnext.utilities.naming.set_by_naming_series") as set_by_naming_series:
+			settings.save()
+
+		set_by_naming_series.assert_not_called()
+
+	def test_customer_metadata_updates_when_related_settings_change(self):
+		settings = frappe.get_single("Selling Settings")
+		settings.cust_master_name = (
+			"Customer Name" if settings.cust_master_name == "Naming Series" else "Naming Series"
+		)
+
+		with patch("erpnext.utilities.naming.set_by_naming_series") as set_by_naming_series:
+			settings.save()
+
+		set_by_naming_series.assert_called_once()