diff --git a/erpnext/selling/report/sales_order_trends/test_sales_order_trends.py b/erpnext/selling/report/sales_order_trends/test_sales_order_trends.py
new file mode 100644
index 00000000000..9fbae8f2e31
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+++ b/erpnext/selling/report/sales_order_trends/test_sales_order_trends.py
@@ -0,0 +1,26 @@
+# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+from erpnext.tests.utils import ERPNextTestSuite
+
+
+class TestSalesOrderTrends(ERPNextTestSuite):
+	def test_report_executes_with_group_by(self):
+		# trends.get_data builds per-period SUM(CASE ...) aggregates (converted from MySQL SUM(IF)),
+		# with a GROUP BY widened to every selected non-aggregated column and a based_on_key for the
+		# group-by detail subqueries. Setting group_by exercises that full path on both engines.
+		from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order
+		from erpnext.selling.report.sales_order_trends.sales_order_trends import execute
+
+		make_sales_order(item_code="_Test Item", qty=3, rate=100)
+
+		filters = {
+			"company": "_Test Company",
+			"period": "Monthly",
+			"based_on": "Item",
+			"group_by": "Customer",
+		}
+		columns, data, _chart_none, _chart = execute(filters)
+
+		self.assertTrue(columns)
+		self.assertTrue(any("_Test Item" in [str(cell) for cell in row] for row in data))