diff --git a/erpnext/accounts/doctype/subscription/test_subscription.py b/erpnext/accounts/doctype/subscription/test_subscription.py
index f41f08a..811fc35 100644
--- a/erpnext/accounts/doctype/subscription/test_subscription.py
+++ b/erpnext/accounts/doctype/subscription/test_subscription.py
@@ -7,8 +7,8 @@
 
 import frappe
 from erpnext.accounts.doctype.subscription.subscription import get_prorata_factor
-from frappe.utils.data import nowdate, add_days, add_to_date, add_months, date_diff, flt, get_date_str
-
+from frappe.utils.data import (nowdate, add_days, add_to_date, add_months, date_diff, flt, get_date_str,
+	get_first_day, get_last_day)
 
 def create_plan():
 	if not frappe.db.exists('Subscription Plan', '_Test Plan Name'):
@@ -68,14 +68,14 @@
 		subscription.party_type = 'Customer'
 		subscription.party = '_Test Customer'
 		subscription.trial_period_start = nowdate()
-		subscription.trial_period_end = add_days(nowdate(), 30)
+		subscription.trial_period_end = add_months(nowdate(), 1)
 		subscription.append('plans', {'plan': '_Test Plan Name', 'qty': 1})
 		subscription.save()
 
 		self.assertEqual(subscription.trial_period_start, nowdate())
-		self.assertEqual(subscription.trial_period_end, add_days(nowdate(), 30))
+		self.assertEqual(subscription.trial_period_end, add_months(nowdate(), 1))
 		self.assertEqual(add_days(subscription.trial_period_end, 1), get_date_str(subscription.current_invoice_start))
-		self.assertEqual(add_days(subscription.current_invoice_start, 30), get_date_str(subscription.current_invoice_end))
+		self.assertEqual(add_to_date(subscription.current_invoice_start, months=1, days=-1), get_date_str(subscription.current_invoice_end))
 		self.assertEqual(subscription.invoices, [])
 		self.assertEqual(subscription.status, 'Trialling')