test: add test for postgres

frappe/tests/test_query_builder.py

@@ -162,6 +162,27 @@ class TestCustomFunctionsPostgres(FrappeTestCase):
 			'"tabnote"."posting_date"+"tabnote"."posting_time" "timestamp"', str(select_query).lower()
 		)
 
+	def test_time(self):
+		note = frappe.qb.DocType("Note")
+
+		self.assertEqual(
+			"CAST('2021-01-01' AS DATE)+CAST('00:00:21' AS TIME)",
+			CombineDatetime("2021-01-01", time(0, 0, 21)).get_sql(),
+		)
+
+		select_query = frappe.qb.from_(note).select(
+			CombineDatetime(note.posting_date, note.posting_time)
+		)
+		self.assertIn('select "posting_date"+"posting_time"', str(select_query).lower())
+
+		select_query = select_query.where(
+			CombineDatetime(note.posting_date, note.posting_time)
+			>= CombineDatetime("2021-01-01", time(0, 0, 1))
+		)
+		self.assertIn("""where "posting_date"+"posting_time">=cast('2021-01-01' as date)+cast('00:00:01' as time)""",
+			str(select_query).lower(),
+		)
+
 	def test_cast(self):
 		note = frappe.qb.DocType("Note")
 		self.assertEqual("CAST(name AS VARCHAR)", Cast_(note.name, "varchar").get_sql())