From 961f2e57dc657e8427a7470da4ec7401ce0107d4 Mon Sep 17 00:00:00 2001
From: Charles Korn <charles.korn@grafana.com>
Date: Mon, 25 Nov 2024 10:55:45 +1100
Subject: [PATCH] Add more test cases

---
 pkg/streamingpromql/engine_test.go                | 8 ++++++++
 pkg/streamingpromql/testdata/ours/subqueries.test | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/pkg/streamingpromql/engine_test.go b/pkg/streamingpromql/engine_test.go
index 0eeec15633d..49c6098117f 100644
--- a/pkg/streamingpromql/engine_test.go
+++ b/pkg/streamingpromql/engine_test.go
@@ -912,6 +912,14 @@ func TestSubqueries(t *testing.T) {
 				Value: promql.Matrix{},
 			},
 		},
+		{
+			// A nested subquery with the same properties as above.
+			Query: `last_over_time((metric > Inf)[20s:10s])[30s:5s]`,
+			Start: time.Unix(30, 0),
+			Result: promql.Result{
+				Value: promql.Matrix{},
+			},
+		},
 		{
 			Query: "metric[20s:5s]",
 			Result: promql.Result{
diff --git a/pkg/streamingpromql/testdata/ours/subqueries.test b/pkg/streamingpromql/testdata/ours/subqueries.test
index 475acde23cb..fe454c43c05 100644
--- a/pkg/streamingpromql/testdata/ours/subqueries.test
+++ b/pkg/streamingpromql/testdata/ours/subqueries.test
@@ -127,3 +127,9 @@ eval range from 0 to 4m step 20s sum_over_time(sum_over_time(metric[2m:30s])[3m:
 
 eval range from 0 to 4m step 3m sum_over_time(sum_over_time(sum_over_time(metric[2m:30s])[3m:15s])[4m:20s])
   {} 0 86
+
+eval range from 0 to 4m step 15s last_over_time((metric > Inf)[20s:10s])
+  # Should produce no results.
+
+eval instant at 3m last_over_time((metric > Inf)[20s:10s])
+  # Should produce no results.