refactor: Use IntegrationTestCase in multiple files

Signed-off-by: David <dgx.arnold@gmail.com>

erpnext/controllers/tests/test_item_variant.py

@@ -2,6 +2,7 @@ import json
 import unittest
 
 import frappe
+from frappe.tests import IntegrationTestCase
 
 from erpnext.controllers.item_variant import copy_attributes_to_variant, make_variant_item_code
 from erpnext.stock.doctype.item.test_item import set_item_variant_settings
@@ -10,7 +11,7 @@ from erpnext.stock.doctype.quality_inspection.test_quality_inspection import (
 )
 
 
-class TestItemVariant(unittest.TestCase):
+class TestItemVariant(IntegrationTestCase):
 	def test_tables_in_template_copied_to_variant(self):
 		fields = [{"field_name": "quality_inspection_template"}]
 		set_item_variant_settings(fields)

erpnext/controllers/tests/test_mapper.py

@@ -4,11 +4,12 @@ import unittest
 import frappe
 import frappe.utils
 from frappe.model import mapper
+from frappe.tests import IntegrationTestCase
 from frappe.tests.utils import make_test_records
 from frappe.utils import add_months, nowdate
 
 
-class TestMapper(unittest.TestCase):
+class TestMapper(IntegrationTestCase):
 	def test_map_docs(self):
 		"""Test mapping of multiple source docs on a single target doc"""
 

erpnext/controllers/tests/test_qty_based_taxes.py

@@ -2,13 +2,14 @@ import unittest
 from uuid import uuid4 as _uuid4
 
 import frappe
+from frappe.tests import IntegrationTestCase
 
 
 def uuid4():
 	return str(_uuid4())
 
 
-class TestTaxes(unittest.TestCase):
+class TestTaxes(IntegrationTestCase):
 	def setUp(self):
 		self.company = frappe.get_doc(
 			{

erpnext/controllers/tests/test_queries.py

@@ -2,6 +2,7 @@ import unittest
 from functools import partial
 
 import frappe
+from frappe.tests import IntegrationTestCase
 
 from erpnext.controllers import queries
 
@@ -10,7 +11,7 @@ def add_default_params(func, doctype):
 	return partial(func, doctype=doctype, txt="", searchfield="name", start=0, page_len=20, filters=None)
 
 
-class TestQueries(unittest.TestCase):
+class TestQueries(IntegrationTestCase):
 	# All tests are based on doctype/test_records.json
 
 	def assert_nested_in(self, item, container):

erpnext/controllers/tests/test_transaction_base.py

@@ -1,9 +1,10 @@
 import unittest
 
 import frappe
+from frappe.tests import IntegrationTestCase
 
 
-class TestUtils(unittest.TestCase):
+class TestUtils(IntegrationTestCase):
 	def test_reset_default_field_value(self):
 		doc = frappe.get_doc(
 			{