adding test cases
diff --git a/erpnext/crm/doctype/prospect/test_prospect.py b/erpnext/crm/doctype/prospect/test_prospect.py
index f266a50..0fffad1 100644
--- a/erpnext/crm/doctype/prospect/test_prospect.py
+++ b/erpnext/crm/doctype/prospect/test_prospect.py
@@ -1,8 +1,54 @@
 # Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
 
-# import frappe
+import frappe
 import unittest
+from frappe.utils import random_string
+from erpnext.crm.doctype.lead.test_lead import make_lead
+from erpnext.crm.doctype.lead.lead import add_lead_to_prospect
+
 
 class TestProspect(unittest.TestCase):
-	pass
+	def test_add_lead_to_prospect_and_address_linking(self):
+		lead_doc = make_lead()
+		address_doc = make_address(address_title=lead_doc.name)
+		address_doc.append('links', {
+				"link_doctype": lead_doc.doctype,
+				"link_name": lead_doc.name
+			})
+		address_doc.save()
+		prospect_doc = make_prospect()
+		add_lead_to_prospect(lead_doc.name, prospect_doc.name)
+		prospect_doc.reload()
+		lead_exists_in_prosoect = False
+		for rec in prospect_doc.get('prospect_lead'):
+			if rec.lead == lead_doc.name:
+				lead_exists_in_prosoect = True
+		self.assertEqual(lead_exists_in_prosoect, True)
+		address_doc.reload()
+		self.assertEqual(address_doc.has_link('Prospect', prospect_doc.name), True)
+
+
+def make_prospect(**args):
+	args = frappe._dict(args)
+
+	prospect_doc = frappe.get_doc({
+		"doctype": "Prospect",
+		"company_name": args.company_name or "_Test Company {}".format(random_string(3)),
+	}).insert()
+
+	return prospect_doc
+
+def make_address(**args):
+	args = frappe._dict(args)
+
+	address_doc = frappe.get_doc({
+		"doctype": "Address",
+		"address_title": args.address_title or "Address Title",
+		"address_type": args.address_type or "Billing",
+		"city": args.city or "Mumbai",
+		"address_line1": args.address_line1 or "Vidya Vihar West",
+		"country": args.country or "India"
+	}).insert()
+
+	return address_doc