diff --git a/erpnext/stock/doctype/serial_no/test_serial_no.py b/erpnext/stock/doctype/serial_no/test_serial_no.py
index 057a7d4c01f..0d362d9024e 100644
--- a/erpnext/stock/doctype/serial_no/test_serial_no.py
+++ b/erpnext/stock/doctype/serial_no/test_serial_no.py
@@ -6,10 +6,12 @@
 
 
 import frappe
+from frappe.tests.utils import FrappeTestCase
 
 from erpnext.stock.doctype.delivery_note.test_delivery_note import create_delivery_note
 from erpnext.stock.doctype.item.test_item import make_item
 from erpnext.stock.doctype.purchase_receipt.test_purchase_receipt import make_purchase_receipt
+from erpnext.stock.doctype.serial_no.serial_no import *
 from erpnext.stock.doctype.serial_no.serial_no import get_serial_nos
 from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
 from erpnext.stock.doctype.stock_entry.test_stock_entry import make_serialized_item
@@ -18,9 +20,6 @@ from erpnext.stock.doctype.warehouse.test_warehouse import create_warehouse
 test_dependencies = ["Item"]
 test_records = frappe.get_test_records('Serial No')
 
-from frappe.tests.utils import FrappeTestCase
-
-from erpnext.stock.doctype.serial_no.serial_no import *
 
 
 class TestSerialNo(FrappeTestCase):
@@ -242,3 +241,48 @@ class TestSerialNo(FrappeTestCase):
 			)
 		self.assertEqual(value_diff, -113)
 
+	def test_auto_fetch(self):
+		item_code = make_item(properties={
+			"has_serial_no": 1,
+			"has_batch_no": 1,
+			"create_new_batch": 1,
+			"serial_no_series": "TEST.#######"
+		}).name
+		warehouse = "_Test Warehouse - _TC"
+
+		in1 = make_stock_entry(item_code=item_code, to_warehouse=warehouse, qty=5)
+		in2 = make_stock_entry(item_code=item_code, to_warehouse=warehouse, qty=5)
+
+		in1.reload()
+		in2.reload()
+
+		batch_wise_serials = {
+			in1.items[0].batch_no: get_serial_nos(in1.items[0].serial_no),
+			in2.items[0].batch_no: get_serial_nos(in2.items[0].serial_no)
+		}
+
+		# Test FIFO
+		first_fetch = auto_fetch_serial_number(5, item_code, warehouse)
+		self.assertEqual(first_fetch, batch_wise_serials[in1.items[0].batch_no])
+
+		# partial FIFO
+		partial_fetch = auto_fetch_serial_number(2, item_code, warehouse)
+		self.assertTrue(set(partial_fetch).issubset(set(first_fetch)),
+				msg=f"{partial_fetch} should be subset of {first_fetch}")
+
+		# exclusion
+		remaining = auto_fetch_serial_number(3, item_code, warehouse, exclude_sr_nos=partial_fetch)
+		self.assertEqual(sorted(remaining + partial_fetch), first_fetch)
+
+		# batchwise
+		for batch, expected_serials in batch_wise_serials.items():
+			fetched_sr = auto_fetch_serial_number(5, item_code, warehouse, batch_nos=batch)
+			self.assertEqual(fetched_sr, sorted(expected_serials))
+
+		# non existing warehouse
+		self.assertEqual(auto_fetch_serial_number(10, item_code, warehouse="Nonexisting"), [])
+
+		# multi batch
+		all_serials = [sr for sr_list in batch_wise_serials.values() for sr in sr_list]
+		fetched_serials = auto_fetch_serial_number(10, item_code, warehouse, batch_nos=list(batch_wise_serials.keys()))
+		self.assertEqual(sorted(all_serials), fetched_serials)