test: add test for item attribute completion
diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index a5bc492..ec46f60 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -1281,12 +1281,13 @@
 
 
 @frappe.whitelist()
-def get_item_attribute(parent, attribute_value=''):
+def get_item_attribute(parent, attribute_value=""):
+	"""Used for providing auto-completions in child table."""
 	if not frappe.has_permission("Item"):
 		frappe.throw(_("No Permission"))
 
 	return frappe.get_all("Item Attribute Value", fields = ["attribute_value"],
-		filters = {'parent': parent, 'attribute_value': ("like", "%%%s%%" % attribute_value)})
+		filters = {'parent': parent, 'attribute_value': ("like", f"%{attribute_value}%")})
 
 def update_variants(variants, template, publish_progress=True):
 	total = len(variants)
diff --git a/erpnext/stock/doctype/item/test_item.py b/erpnext/stock/doctype/item/test_item.py
index d9d1e5a..7cd6050 100644
--- a/erpnext/stock/doctype/item/test_item.py
+++ b/erpnext/stock/doctype/item/test_item.py
@@ -10,13 +10,13 @@
 from erpnext.controllers.item_variant import (create_variant, ItemVariantExistsError,
 	InvalidItemAttributeValueError, get_variant)
 from erpnext.stock.doctype.item.item import StockExistsForTemplate, InvalidBarcode
-from erpnext.stock.doctype.item.item import get_uom_conv_factor
+from erpnext.stock.doctype.item.item import get_uom_conv_factor, get_item_attribute
 from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
 from erpnext.stock.get_item_details import get_item_details
 
 
 test_ignore = ["BOM"]
-test_dependencies = ["Warehouse", "Item Group", "Item Tax Template", "Brand"]
+test_dependencies = ["Warehouse", "Item Group", "Item Tax Template", "Brand", "Item Attribute"]
 
 def make_item(item_code, properties=None):
 	if frappe.db.exists("Item", item_code):
@@ -500,6 +500,21 @@
 		if expected_columns:
 			self.fail(f"Expected db index on these columns: {', '.join(expected_columns)}")
 
+	def test_attribute_completions(self):
+		expected_attrs = [{'attribute_value': 'Small'},
+		 {'attribute_value': 'Extra Small'},
+		 {'attribute_value': 'Extra Large'},
+		 {'attribute_value': 'Large'},
+		 {'attribute_value': '2XL'},
+		 {'attribute_value': 'Medium'}]
+
+		attrs = get_item_attribute("Test Size")
+		self.assertEqual(attrs, expected_attrs)
+
+		attrs = get_item_attribute("Test Size", attribute_value="extra")
+		self.assertEqual(attrs, [{'attribute_value': 'Extra Small'}, {'attribute_value': 'Extra Large'}])
+
+
 
 def set_item_variant_settings(fields):
 	doc = frappe.get_doc('Item Variant Settings')