diff --git a/erpnext/accounts/doctype/accounting_period/test_accounting_period.py b/erpnext/accounts/doctype/accounting_period/test_accounting_period.py
index 99694d2..cc2e6a9 100644
--- a/erpnext/accounts/doctype/accounting_period/test_accounting_period.py
+++ b/erpnext/accounts/doctype/accounting_period/test_accounting_period.py
@@ -7,4 +7,21 @@
 import unittest
 
 class TestAccountingPeriod(unittest.TestCase):
-	pass
+	def test_overlap(self):
+		ap1 = create_accounting_period({"start_date":"2018-04-01", "end_date":"2018-06-30", "company":"Wind Power LLC"})
+		ap1.save()
+		ap2 = create_accounting_period({"start_date":"2018-06-30", "end_date":"2018-07-10", "company":"Wind Power LLC"})
+		self.assertRaises(frappe.OverlapError, accounting_period_2.save())	
+	
+	def tearDown(self):
+		pass
+
+
+def create_accounting_period(**args):
+	accounting_period = frappe.new_doc("Accounting Period")
+	accounting_period.start_date = args.start_date or frappe.utils.datetime.date(2018, 4, 1)
+	accounting_period.end_date = args.end_date or frappe.utils.datetime.date(2018, 6, 30)
+	accounting_period.company = args.company
+	accounting_period.period_name = "_Test_Period_Name_1"
+	
+	return accounting_period