refactor: Use IntegrationTestCase in multiple files

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

erpnext/tests/test_init.py

@@ -1,13 +1,14 @@
 import unittest
 
 import frappe
+from frappe.tests import IntegrationTestCase
 
 from erpnext import encode_company_abbr
 
 test_records = frappe.get_test_records("Company")
 
 
-class TestInit(unittest.TestCase):
+class TestInit(IntegrationTestCase):
 	def test_encode_company_abbr(self):
 		abbr = "NFECT"