test: add coverage for BOM Explorer report

erpnext/manufacturing/report/bom_explorer/test_bom_explorer.py

@@ -0,0 +1,70 @@
+# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+import frappe
+
+from erpnext.manufacturing.doctype.bom.test_bom import create_nested_bom
+from erpnext.manufacturing.report.bom_explorer.bom_explorer import execute
+from erpnext.tests.utils import ERPNextTestSuite
+
+
+class TestBOMExplorer(ERPNextTestSuite):
+	def run_report(self, bom):
+		filters = frappe._dict({"bom": bom})
+		return execute(filters)[1]
+
+	def test_default_bom_lists_components_at_top_level(self):
+		bom = frappe.db.get_value("BOM", {"item": "_Test FG Item", "is_active": 1, "is_default": 1})
+		self.assertIsNotNone(bom, "Default active BOM for _Test FG Item not found")
+
+		data = self.run_report(bom)
+		rows_by_item = {row["item_code"]: row for row in data}
+
+		self.assertIn("_Test Item", rows_by_item)
+		self.assertIn("_Test Item Home Desktop 100", rows_by_item)
+
+		for item_code in ("_Test Item", "_Test Item Home Desktop 100"):
+			row = rows_by_item[item_code]
+			self.assertEqual(row["indent"], 0)
+			self.assertEqual(row["bom_level"], 0)
+
+	def test_qty_matches_bom_item_qty(self):
+		bom = frappe.db.get_value("BOM", {"item": "_Test FG Item", "is_active": 1, "is_default": 1})
+		data = self.run_report(bom)
+		rows_by_item = {row["item_code"]: row for row in data}
+
+		for bom_item in frappe.get_all(
+			"BOM Item", filters={"parent": bom}, fields=["item_code", "qty", "uom"]
+		):
+			row = rows_by_item[bom_item.item_code]
+			self.assertEqual(row["qty"], bom_item.qty)
+			self.assertEqual(row["uom"], bom_item.uom)
+
+	def test_nested_bom_shows_deeper_level(self):
+		# Sub-assembly: "sub" is itself a BOM containing "leaf".
+		parent_bom = create_nested_bom(
+			{"parent": {"sub": {"leaf": {}}, "flat": {}}},
+			prefix="_Test explorer ",
+		)
+
+		data = self.run_report(parent_bom.name)
+		rows_by_item = {row["item_code"]: row for row in data}
+
+		sub_item = "_Test explorer sub"
+		leaf_item = "_Test explorer leaf"
+		flat_item = "_Test explorer flat"
+
+		self.assertIn(sub_item, rows_by_item)
+		self.assertIn(flat_item, rows_by_item)
+		self.assertIn(leaf_item, rows_by_item)
+
+		# Direct components of the parent sit at level 0.
+		self.assertEqual(rows_by_item[flat_item]["indent"], 0)
+		self.assertEqual(rows_by_item[sub_item]["indent"], 0)
+
+		# The sub-assembly row carries its own BOM reference.
+		self.assertTrue(rows_by_item[sub_item]["bom"])
+
+		# The leaf belongs to the sub-assembly, so it is exploded one level deeper.
+		self.assertEqual(rows_by_item[leaf_item]["indent"], 1)
+		self.assertEqual(rows_by_item[leaf_item]["bom_level"], 1)