test: picklist item grouping

(cherry picked from commit 479ecb8de0)

erpnext/stock/doctype/pick_list/test_pick_list.py

@@ -4,6 +4,7 @@
 from __future__ import unicode_literals
 
 import frappe
+from frappe import _dict
 
 test_dependencies = ['Item', 'Sales Invoice', 'Stock Entry', 'Batch']
 
@@ -356,6 +357,39 @@ class TestPickList(ERPNextTestCase):
 		sales_order.cancel()
 		purchase_receipt.cancel()
 
+	def test_pick_list_grouping_before_print(self):
+		def _compare_dicts(a, b):
+			"compare dicts but ignore missing keys in `a`"
+			for key, value in a.items():
+				self.assertEqual(b.get(key), value, msg=f"{key} doesn't match")
+
+		# nothing should be grouped
+		pl = frappe.get_doc(doctype="Pick List", group_same_items=True, locations=[
+			_dict(item_code="A", warehouse="X", qty=1, picked_qty=2),
+			_dict(item_code="B", warehouse="X", qty=1, picked_qty=2),
+			_dict(item_code="A", warehouse="Y", qty=1, picked_qty=2),
+			_dict(item_code="B", warehouse="Y", qty=1, picked_qty=2),
+		])
+		pl.before_print()
+		self.assertEqual(len(pl.locations), 4)
+
+		# grouping should halve the number of items
+		pl = frappe.get_doc(doctype="Pick List", group_same_items=True, locations=[
+			_dict(item_code="A", warehouse="X", qty=5, picked_qty=1),
+			_dict(item_code="B", warehouse="Y", qty=4, picked_qty=2),
+			_dict(item_code="A", warehouse="X", qty=3, picked_qty=2),
+			_dict(item_code="B", warehouse="Y", qty=2, picked_qty=2),
+		])
+		pl.before_print()
+		self.assertEqual(len(pl.locations), 2)
+
+		expected_items = [
+			_dict(item_code="A", warehouse="X", qty=8, picked_qty=3),
+			_dict(item_code="B", warehouse="Y", qty=6, picked_qty=4),
+		]
+		for expected_item, created_item in zip(expected_items, pl.locations):
+			_compare_dicts(expected_item, created_item)
+
 	# def test_pick_list_skips_items_in_expired_batch(self):
 	# 	pass