diff --git a/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py
index aa3d1b3..e365d60 100644
--- a/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py
@@ -5,7 +5,7 @@
 import unittest
 
 import frappe
-from frappe.tests.utils import change_settings
+from frappe.tests.utils import FrappeTestCase, change_settings
 from frappe.utils import add_days, cint, flt, getdate, nowdate, today
 
 import erpnext
@@ -38,7 +38,7 @@
 test_ignore = ["Serial No"]
 
 
-class TestPurchaseInvoice(unittest.TestCase, StockTestMixin):
+class TestPurchaseInvoice(FrappeTestCase, StockTestMixin):
 	@classmethod
 	def setUpClass(self):
 		unlink_payment_on_cancel_of_invoice()
@@ -48,6 +48,9 @@
 	def tearDownClass(self):
 		unlink_payment_on_cancel_of_invoice(0)
 
+	def tearDown(self):
+		frappe.db.rollback()
+
 	def test_purchase_invoice_received_qty(self):
 		"""
 		1. Test if received qty is validated against accepted + rejected
@@ -422,6 +425,7 @@
 			self.assertEqual(tax.tax_amount, expected_values[i][1])
 			self.assertEqual(tax.total, expected_values[i][2])
 
+	@change_settings("Accounts Settings", {"unlink_payment_on_cancellation_of_invoice": 1})
 	def test_purchase_invoice_with_advance(self):
 		from erpnext.accounts.doctype.journal_entry.test_journal_entry import (
 			test_records as jv_test_records,
@@ -476,6 +480,7 @@
 			)
 		)
 
+	@change_settings("Accounts Settings", {"unlink_payment_on_cancellation_of_invoice": 1})
 	def test_invoice_with_advance_and_multi_payment_terms(self):
 		from erpnext.accounts.doctype.journal_entry.test_journal_entry import (
 			test_records as jv_test_records,
@@ -1220,6 +1225,7 @@
 		acc_settings.submit_journal_entriessubmit_journal_entries = 0
 		acc_settings.save()
 
+	@change_settings("Accounts Settings", {"unlink_payment_on_cancellation_of_invoice": 1})
 	def test_gain_loss_with_advance_entry(self):
 		unlink_enabled = frappe.db.get_value(
 			"Accounts Settings", "Accounts Settings", "unlink_payment_on_cancel_of_invoice"
@@ -1420,6 +1426,7 @@
 		)
 		frappe.db.set_value("Company", "_Test Company", "exchange_gain_loss_account", original_account)
 
+	@change_settings("Accounts Settings", {"unlink_payment_on_cancellation_of_invoice": 1})
 	def test_purchase_invoice_advance_taxes(self):
 		from erpnext.accounts.doctype.payment_entry.payment_entry import get_payment_entry
 
diff --git a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
index 8aa1f4c..c1adffd 100644
--- a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
@@ -6,7 +6,7 @@
 
 import frappe
 from frappe.model.dynamic_links import get_dynamic_link_map
-from frappe.tests.utils import change_settings
+from frappe.tests.utils import FrappeTestCase, change_settings
 from frappe.utils import add_days, flt, getdate, nowdate, today
 
 import erpnext
@@ -45,13 +45,17 @@
 from erpnext.stock.utils import get_incoming_rate, get_stock_balance
 
 
-class TestSalesInvoice(unittest.TestCase):
+class TestSalesInvoice(FrappeTestCase):
 	def setUp(self):
 		from erpnext.stock.doctype.stock_ledger_entry.test_stock_ledger_entry import create_items
 
 		create_items(["_Test Internal Transfer Item"], uoms=[{"uom": "Box", "conversion_factor": 10}])
 		create_internal_parties()
 		setup_accounts()
+		frappe.db.set_single_value("Accounts Settings", "acc_frozen_upto", None)
+
+	def tearDown(self):
+		frappe.db.rollback()
 
 	def make(self):
 		w = frappe.copy_doc(test_records[0])
@@ -179,6 +183,7 @@
 		self.assertRaises(frappe.LinkExistsError, si.cancel)
 		unlink_payment_on_cancel_of_invoice()
 
+	@change_settings("Accounts Settings", {"unlink_payment_on_cancellation_of_invoice": 1})
 	def test_payment_entry_unlink_against_standalone_credit_note(self):
 		from erpnext.accounts.doctype.payment_entry.test_payment_entry import get_payment_entry
 
@@ -1300,6 +1305,7 @@
 		dn.submit()
 		return dn
 
+	@change_settings("Accounts Settings", {"unlink_payment_on_cancellation_of_invoice": 1})
 	def test_sales_invoice_with_advance(self):
 		from erpnext.accounts.doctype.journal_entry.test_journal_entry import (
 			test_records as jv_test_records,
@@ -2775,6 +2781,13 @@
 			company="_Test Company",
 		)
 
+		tds_payable_account = create_account(
+			account_name="TDS Payable",
+			account_type="Tax",
+			parent_account="Duties and Taxes - _TC",
+			company="_Test Company",
+		)
+
 		si = create_sales_invoice(parent_cost_center="Main - _TC", do_not_save=1)
 		si.apply_discount_on = "Grand Total"
 		si.additional_discount_account = additional_discount_account
@@ -3073,8 +3086,8 @@
 			si.commission_rate = commission_rate
 			self.assertRaises(frappe.ValidationError, si.save)
 
+	@change_settings("Accounts Settings", {"acc_frozen_upto": add_days(getdate(), 1)})
 	def test_sales_invoice_submission_post_account_freezing_date(self):
-		frappe.db.set_single_value("Accounts Settings", "acc_frozen_upto", add_days(getdate(), 1))
 		si = create_sales_invoice(do_not_save=True)
 		si.posting_date = add_days(getdate(), 1)
 		si.save()
@@ -3083,8 +3096,6 @@
 		si.posting_date = getdate()
 		si.submit()
 
-		frappe.db.set_single_value("Accounts Settings", "acc_frozen_upto", None)
-
 	def test_over_billing_case_against_delivery_note(self):
 		"""
 		Test a case where duplicating the item with qty = 1 in the invoice
@@ -3113,6 +3124,13 @@
 
 		frappe.db.set_single_value("Accounts Settings", "over_billing_allowance", over_billing_allowance)
 
+	@change_settings(
+		"Accounts Settings",
+		{
+			"book_deferred_entries_via_journal_entry": 1,
+			"submit_journal_entries": 1,
+		},
+	)
 	def test_multi_currency_deferred_revenue_via_journal_entry(self):
 		deferred_account = create_account(
 			account_name="Deferred Revenue",
@@ -3120,11 +3138,6 @@
 			company="_Test Company",
 		)
 
-		acc_settings = frappe.get_single("Accounts Settings")
-		acc_settings.book_deferred_entries_via_journal_entry = 1
-		acc_settings.submit_journal_entries = 1
-		acc_settings.save()
-
 		item = create_item("_Test Item for Deferred Accounting")
 		item.enable_deferred_expense = 1
 		item.item_defaults[0].deferred_revenue_account = deferred_account
@@ -3190,13 +3203,6 @@
 			self.assertEqual(expected_gle[i][2], gle.debit)
 			self.assertEqual(getdate(expected_gle[i][3]), gle.posting_date)
 
-		acc_settings = frappe.get_single("Accounts Settings")
-		acc_settings.book_deferred_entries_via_journal_entry = 0
-		acc_settings.submit_journal_entries = 0
-		acc_settings.save()
-
-		frappe.db.set_single_value("Accounts Settings", "acc_frozen_upto", None)
-
 	def test_standalone_serial_no_return(self):
 		si = create_sales_invoice(
 			item_code="_Test Serialized Item With Series", update_stock=True, is_return=True, qty=-1
diff --git a/erpnext/accounts/doctype/subscription/test_subscription.py b/erpnext/accounts/doctype/subscription/test_subscription.py
index 803e879..785fd04 100644
--- a/erpnext/accounts/doctype/subscription/test_subscription.py
+++ b/erpnext/accounts/doctype/subscription/test_subscription.py
@@ -4,6 +4,7 @@
 import unittest
 
 import frappe
+from frappe.tests.utils import FrappeTestCase
 from frappe.utils.data import (
 	add_days,
 	add_months,
@@ -21,11 +22,15 @@
 test_dependencies = ("UOM", "Item Group", "Item")
 
 
-class TestSubscription(unittest.TestCase):
+class TestSubscription(FrappeTestCase):
 	def setUp(self):
 		make_plans()
 		create_parties()
 		reset_settings()
+		frappe.db.set_single_value("Accounts Settings", "acc_frozen_upto", None)
+
+	def tearDown(self):
+		frappe.db.rollback()
 
 	def test_create_subscription_with_trial_with_correct_period(self):
 		subscription = create_subscription(