diff --git a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
index 23007fbc1ae..add640a3326 100644
--- a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
@@ -890,20 +890,6 @@ class TestSalesInvoice(unittest.TestCase):
 
 		self.assertEquals(si.get("items")[0].serial_no, dn.get("items")[0].serial_no)
 
-	def test_invoice_due_date_against_customers_credit_days(self):
-		# set customer's credit days
-		frappe.db.set_value("Customer", "_Test Customer", "credit_days_based_on", "Fixed Days")
-		frappe.db.set_value("Customer", "_Test Customer", "credit_days", 10)
-
-		si = create_sales_invoice()
-		self.assertEqual(si.due_date, add_days(nowdate(), 10))
-
-		# set customer's credit days is last day of the next month
-		frappe.db.set_value("Customer", "_Test Customer", "credit_days_based_on", "Last Day of the Next Month")
-
-		si1 = create_sales_invoice(posting_date="2015-07-05")
-		self.assertEqual(si1.due_date, "2015-08-31")
-
 	def test_return_sales_invoice(self):
 		set_perpetual_inventory()
 		make_stock_entry(item_code="_Test Item", target="_Test Warehouse - _TC", qty=50, basic_rate=100)
diff --git a/erpnext/buying/doctype/supplier/test_supplier.py b/erpnext/buying/doctype/supplier/test_supplier.py
index 1d089e70982..298eb009213 100644
--- a/erpnext/buying/doctype/supplier/test_supplier.py
+++ b/erpnext/buying/doctype/supplier/test_supplier.py
@@ -16,7 +16,7 @@ class TestSupplier(unittest.TestCase):
         frappe.db.set_value("Supplier", "_Test Supplier", "credit_days_based_on", "Fixed Days")
         frappe.db.set_value("Supplier", "_Test Supplier", "credit_days", 10)
 
-        due_date = get_due_date("2016-01-22", "Supplier", "_Test Supplier", "_Test Company")
+        due_date = get_due_date("2016-01-22", "Supplier", "_Test Supplier")
         self.assertEqual(due_date, "2016-02-01")
 
         # Set Credit Limit based on Last day next month