diff --git a/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py b/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py
index d5db3fc..eff2344 100644
--- a/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py
+++ b/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py
@@ -1,17 +1,15 @@
 # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
-
-import unittest
-
 import frappe
 from frappe.utils import add_months, today
 
 from erpnext import get_company_currency
+from erpnext.tests.utils import ERPNextTestCase
 
 from .blanket_order import make_order
 
 
-class TestBlanketOrder(unittest.TestCase):
+class TestBlanketOrder(ERPNextTestCase):
 	def setUp(self):
 		frappe.flags.args = frappe._dict()
 
diff --git a/erpnext/manufacturing/doctype/bom/test_bom.py b/erpnext/manufacturing/doctype/bom/test_bom.py
index 4c03230..178d92c 100644
--- a/erpnext/manufacturing/doctype/bom/test_bom.py
+++ b/erpnext/manufacturing/doctype/bom/test_bom.py
@@ -2,7 +2,6 @@
 # License: GNU General Public License v3. See license.txt
 
 
-import unittest
 from collections import deque
 from functools import partial
 
@@ -18,10 +17,11 @@
 	create_stock_reconciliation,
 )
 from erpnext.tests.test_subcontracting import set_backflush_based_on
+from erpnext.tests.utils import ERPNextTestCase
 
 test_records = frappe.get_test_records('BOM')
 
-class TestBOM(unittest.TestCase):
+class TestBOM(ERPNextTestCase):
 	def setUp(self):
 		if not frappe.get_value('Item', '_Test Item'):
 			make_test_records('Item')
diff --git a/erpnext/manufacturing/doctype/bom_update_tool/test_bom_update_tool.py b/erpnext/manufacturing/doctype/bom_update_tool/test_bom_update_tool.py
index 526c243..12576cb 100644
--- a/erpnext/manufacturing/doctype/bom_update_tool/test_bom_update_tool.py
+++ b/erpnext/manufacturing/doctype/bom_update_tool/test_bom_update_tool.py
@@ -1,19 +1,16 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
 
-
-
-import unittest
-
 import frappe
 
 from erpnext.manufacturing.doctype.bom_update_tool.bom_update_tool import update_cost
 from erpnext.manufacturing.doctype.production_plan.test_production_plan import make_bom
 from erpnext.stock.doctype.item.test_item import create_item
+from erpnext.tests.utils import ERPNextTestCase
 
 test_records = frappe.get_test_records('BOM')
 
-class TestBOMUpdateTool(unittest.TestCase):
+class TestBOMUpdateTool(ERPNextTestCase):
 	def test_replace_bom(self):
 		current_bom = "BOM-_Test Item Home Desktop Manufactured-001"
 
diff --git a/erpnext/manufacturing/doctype/job_card/test_job_card.py b/erpnext/manufacturing/doctype/job_card/test_job_card.py
index 9b4fc8b..bb5004b 100644
--- a/erpnext/manufacturing/doctype/job_card/test_job_card.py
+++ b/erpnext/manufacturing/doctype/job_card/test_job_card.py
@@ -1,6 +1,5 @@
 # Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
-import unittest
 
 import frappe
 from frappe.utils import random_string
@@ -12,9 +11,10 @@
 from erpnext.manufacturing.doctype.work_order.test_work_order import make_wo_order_test_record
 from erpnext.manufacturing.doctype.workstation.test_workstation import make_workstation
 from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestJobCard(unittest.TestCase):
+class TestJobCard(ERPNextTestCase):
 	def setUp(self):
 		make_bom_for_jc_tests()
 
@@ -329,4 +329,4 @@
 	bom.rm_cost_as_per = "Valuation Rate"
 	bom.items[0].uom = "_Test UOM 1"
 	bom.items[0].conversion_factor = 5
-	bom.insert()
\ No newline at end of file
+	bom.insert()
diff --git a/erpnext/manufacturing/doctype/production_plan/test_production_plan.py b/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
index a2980a7..2febc1e 100644
--- a/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
@@ -1,8 +1,5 @@
 # Copyright (c) 2017, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
-
-import unittest
-
 import frappe
 from frappe.utils import add_to_date, flt, now_datetime, nowdate
 
@@ -17,9 +14,10 @@
 from erpnext.stock.doctype.stock_reconciliation.test_stock_reconciliation import (
 	create_stock_reconciliation,
 )
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestProductionPlan(unittest.TestCase):
+class TestProductionPlan(ERPNextTestCase):
 	def setUp(self):
 		for item in ['Test Production Item 1', 'Subassembly Item 1',
 			'Raw Material Item 1', 'Raw Material Item 2']:
diff --git a/erpnext/manufacturing/doctype/routing/test_routing.py b/erpnext/manufacturing/doctype/routing/test_routing.py
index 68d9dec..e90b0a7 100644
--- a/erpnext/manufacturing/doctype/routing/test_routing.py
+++ b/erpnext/manufacturing/doctype/routing/test_routing.py
@@ -1,17 +1,15 @@
 # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
-
-import unittest
-
 import frappe
 from frappe.test_runner import make_test_records
 
 from erpnext.manufacturing.doctype.job_card.job_card import OperationSequenceError
 from erpnext.manufacturing.doctype.work_order.test_work_order import make_wo_order_test_record
 from erpnext.stock.doctype.item.test_item import make_item
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestRouting(unittest.TestCase):
+class TestRouting(ERPNextTestCase):
 	@classmethod
 	def setUpClass(cls):
 		cls.item_code = "Test Routing Item - A"
diff --git a/erpnext/manufacturing/doctype/work_order/test_work_order.py b/erpnext/manufacturing/doctype/work_order/test_work_order.py
index 4e83b65..165e0ac 100644
--- a/erpnext/manufacturing/doctype/work_order/test_work_order.py
+++ b/erpnext/manufacturing/doctype/work_order/test_work_order.py
@@ -1,6 +1,5 @@
 # Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
-import unittest
 
 import frappe
 from frappe.utils import add_months, cint, flt, now, today
diff --git a/erpnext/manufacturing/doctype/workstation/test_workstation.py b/erpnext/manufacturing/doctype/workstation/test_workstation.py
index 5ed5153..c298c0a 100644
--- a/erpnext/manufacturing/doctype/workstation/test_workstation.py
+++ b/erpnext/manufacturing/doctype/workstation/test_workstation.py
@@ -1,8 +1,5 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors and Contributors
 # See license.txt
-
-import unittest
-
 import frappe
 from frappe.test_runner import make_test_records
 
@@ -13,12 +10,13 @@
 	WorkstationHolidayError,
 	check_if_within_operating_hours,
 )
+from erpnext.tests.utils import ERPNextTestCase
 
 test_dependencies = ["Warehouse"]
 test_records = frappe.get_test_records('Workstation')
 make_test_records('Workstation')
 
-class TestWorkstation(unittest.TestCase):
+class TestWorkstation(ERPNextTestCase):
 	def test_validate_timings(self):
 		check_if_within_operating_hours("_Test Workstation 1", "Operation 1", "2013-02-02 11:00:00", "2013-02-02 19:00:00")
 		check_if_within_operating_hours("_Test Workstation 1", "Operation 1", "2013-02-02 10:00:00", "2013-02-02 20:00:00")
diff --git a/erpnext/selling/doctype/customer/test_customer.py b/erpnext/selling/doctype/customer/test_customer.py
index 7d6b74d..5301fd0 100644
--- a/erpnext/selling/doctype/customer/test_customer.py
+++ b/erpnext/selling/doctype/customer/test_customer.py
@@ -2,8 +2,6 @@
 # License: GNU General Public License v3. See license.txt
 
 
-import unittest
-
 import frappe
 from frappe.test_runner import make_test_records
 from frappe.utils import flt
@@ -11,7 +9,7 @@
 from erpnext.accounts.party import get_due_date
 from erpnext.exceptions import PartyDisabled, PartyFrozen
 from erpnext.selling.doctype.customer.customer import get_credit_limit, get_customer_outstanding
-from erpnext.tests.utils import create_test_contact_and_address
+from erpnext.tests.utils import ERPNextTestCase, create_test_contact_and_address
 
 test_ignore = ["Price List"]
 test_dependencies = ['Payment Term', 'Payment Terms Template']
@@ -19,7 +17,7 @@
 
 
 
-class TestCustomer(unittest.TestCase):
+class TestCustomer(ERPNextTestCase):
 	def setUp(self):
 		if not frappe.get_value('Item', '_Test Item'):
 			make_test_records('Item')
diff --git a/erpnext/selling/doctype/party_specific_item/test_party_specific_item.py b/erpnext/selling/doctype/party_specific_item/test_party_specific_item.py
index 874a364..b951044 100644
--- a/erpnext/selling/doctype/party_specific_item/test_party_specific_item.py
+++ b/erpnext/selling/doctype/party_specific_item/test_party_specific_item.py
@@ -6,6 +6,7 @@
 import frappe
 
 from erpnext.controllers.queries import item_query
+from erpnext.tests.utils import ERPNextTestCase
 
 test_dependencies = ['Item', 'Customer', 'Supplier']
 
@@ -17,7 +18,7 @@
 	psi.based_on_value = args.get('based_on_value')
 	psi.insert()
 
-class TestPartySpecificItem(unittest.TestCase):
+class TestPartySpecificItem(ERPNextTestCase):
 	def setUp(self):
 		self.customer = frappe.get_last_doc("Customer")
 		self.supplier = frappe.get_last_doc("Supplier")
diff --git a/erpnext/selling/doctype/quotation/test_quotation.py b/erpnext/selling/doctype/quotation/test_quotation.py
index aa83726..4357201 100644
--- a/erpnext/selling/doctype/quotation/test_quotation.py
+++ b/erpnext/selling/doctype/quotation/test_quotation.py
@@ -1,15 +1,15 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
 
-import unittest
-
 import frappe
 from frappe.utils import add_days, add_months, flt, getdate, nowdate
 
+from erpnext.tests.utils import ERPNextTestCase
+
 test_dependencies = ["Product Bundle"]
 
 
-class TestQuotation(unittest.TestCase):
+class TestQuotation(ERPNextTestCase):
 	def test_make_quotation_without_terms(self):
 		quotation = make_quotation(do_not_save=1)
 		self.assertFalse(quotation.get('payment_schedule'))
diff --git a/erpnext/selling/doctype/sales_order/test_sales_order.py b/erpnext/selling/doctype/sales_order/test_sales_order.py
index 2a0752e..42bc0b7 100644
--- a/erpnext/selling/doctype/sales_order/test_sales_order.py
+++ b/erpnext/selling/doctype/sales_order/test_sales_order.py
@@ -2,7 +2,6 @@
 # License: GNU General Public License v3. See license.txt
 
 import json
-import unittest
 
 import frappe
 import frappe.permissions
@@ -28,12 +27,14 @@
 )
 from erpnext.stock.doctype.item.test_item import make_item
 from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestSalesOrder(unittest.TestCase):
+class TestSalesOrder(ERPNextTestCase):
 
 	@classmethod
 	def setUpClass(cls):
+		super().setUpClass()
 		cls.unlink_setting = int(frappe.db.get_value("Accounts Settings", "Accounts Settings",
 			"unlink_advance_payment_on_cancelation_of_order"))
 
@@ -42,6 +43,7 @@
 		# reset config to previous state
 		frappe.db.set_value("Accounts Settings", "Accounts Settings",
 			"unlink_advance_payment_on_cancelation_of_order", cls.unlink_setting)
+		super().tearDownClass()
 
 	def tearDown(self):
 		frappe.set_user("Administrator")
diff --git a/erpnext/selling/report/pending_so_items_for_purchase_request/test_pending_so_items_for_purchase_request.py b/erpnext/selling/report/pending_so_items_for_purchase_request/test_pending_so_items_for_purchase_request.py
index 9c30afc..d62915f 100644
--- a/erpnext/selling/report/pending_so_items_for_purchase_request/test_pending_so_items_for_purchase_request.py
+++ b/erpnext/selling/report/pending_so_items_for_purchase_request/test_pending_so_items_for_purchase_request.py
@@ -2,8 +2,6 @@
 # For license information, please see license.txt
 
 
-import unittest
-
 from frappe.utils import add_months, nowdate
 
 from erpnext.selling.doctype.sales_order.sales_order import make_material_request
@@ -11,9 +9,10 @@
 from erpnext.selling.report.pending_so_items_for_purchase_request.pending_so_items_for_purchase_request import (
 	execute,
 )
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestPendingSOItemsForPurchaseRequest(unittest.TestCase):
+class TestPendingSOItemsForPurchaseRequest(ERPNextTestCase):
     def test_result_for_partial_material_request(self):
         so = make_sales_order()
         mr=make_material_request(so.name)
diff --git a/erpnext/selling/report/sales_analytics/test_analytics.py b/erpnext/selling/report/sales_analytics/test_analytics.py
index 8ffc5d6..f56cce2 100644
--- a/erpnext/selling/report/sales_analytics/test_analytics.py
+++ b/erpnext/selling/report/sales_analytics/test_analytics.py
@@ -2,15 +2,14 @@
 # For license information, please see license.txt
 
 
-import unittest
-
 import frappe
 
 from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order
 from erpnext.selling.report.sales_analytics.sales_analytics import execute
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestAnalytics(unittest.TestCase):
+class TestAnalytics(ERPNextTestCase):
 	def test_sales_analytics(self):
 		frappe.db.sql("delete from `tabSales Order` where company='_Test Company 2'")