diff --git a/erpnext/controllers/tests/test_item_variant.py b/erpnext/controllers/tests/test_item_variant.py
index b3633e6ff09..d0ccc519b6d 100644
--- a/erpnext/controllers/tests/test_item_variant.py
+++ b/erpnext/controllers/tests/test_item_variant.py
@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 import json
-import unittest
 
 import frappe
 from six import string_types
@@ -11,9 +10,10 @@ from erpnext.stock.doctype.item.test_item import set_item_variant_settings
 from erpnext.stock.doctype.quality_inspection.test_quality_inspection import (
 	create_quality_inspection_parameter,
 )
+from erpnext.tests.utils import ERPNextTestCase
 
 
-class TestItemVariant(unittest.TestCase):
+class TestItemVariant(ERPNextTestCase):
 	def test_tables_in_template_copied_to_variant(self):
 		fields = [{'field_name': 'quality_inspection_template'}]
 		set_item_variant_settings(fields)
diff --git a/erpnext/controllers/tests/test_mapper.py b/erpnext/controllers/tests/test_mapper.py
index 2d1ae43f074..c781d9298f5 100644
--- a/erpnext/controllers/tests/test_mapper.py
+++ b/erpnext/controllers/tests/test_mapper.py
@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 import json
-import unittest
 
 import frappe
 import frappe.utils
@@ -9,8 +8,10 @@ from frappe.model import mapper
 from frappe.test_runner import make_test_records
 from frappe.utils import add_months, nowdate
 
+from erpnext.tests.utils import ERPNextTestCase
 
-class TestMapper(unittest.TestCase):
+
+class TestMapper(ERPNextTestCase):
 	def test_map_docs(self):
 		'''Test mapping of multiple source docs on a single target doc'''
 
diff --git a/erpnext/controllers/tests/test_qty_based_taxes.py b/erpnext/controllers/tests/test_qty_based_taxes.py
index 41673d1e6fb..7131922c3c5 100644
--- a/erpnext/controllers/tests/test_qty_based_taxes.py
+++ b/erpnext/controllers/tests/test_qty_based_taxes.py
@@ -1,15 +1,16 @@
 from __future__ import print_function, unicode_literals
 
-import unittest
 from uuid import uuid4 as _uuid4
 
 import frappe
 
+from erpnext.tests.utils import ERPNextTestCase
+
 
 def uuid4():
     return str(_uuid4())
 
-class TestTaxes(unittest.TestCase):
+class TestTaxes(ERPNextTestCase):
     def setUp(self):
         self.company = frappe.get_doc({
             'doctype': 'Company',
diff --git a/erpnext/controllers/tests/test_queries.py b/erpnext/controllers/tests/test_queries.py
index 05541d16887..ebf188291db 100644
--- a/erpnext/controllers/tests/test_queries.py
+++ b/erpnext/controllers/tests/test_queries.py
@@ -1,7 +1,7 @@
-import unittest
 from functools import partial
 
 from erpnext.controllers import queries
+from erpnext.tests.utils import ERPNextTestCase
 
 
 def add_default_params(func, doctype):
@@ -10,7 +10,7 @@ def add_default_params(func, doctype):
 	)
 
 
-class TestQueries(unittest.TestCase):
+class TestQueries(ERPNextTestCase):
 
 	# All tests are based on doctype/test_records.json