diff --git a/promql/testdata/functions.test b/promql/testdata/functions.test
index f041ffadc..cfabb3c9b 100644
--- a/promql/testdata/functions.test
+++ b/promql/testdata/functions.test
@@ -370,22 +370,40 @@ clear
 eval instant at 0m year()
   {} 1970
 
+eval instant at 0m year(vector(1136239445))
+  {} 2006
+
 eval instant at 0m month()
   {} 1
 
+eval instant at 0m month(vector(1136239445))
+  {} 1
+
 eval instant at 0m day_of_month()
   {} 1
 
+eval instant at 0m day_of_month(vector(1136239445))
+  {} 2
+
 # Thursday.
 eval instant at 0m day_of_week()
   {} 4
 
+eval instant at 0m day_of_week(vector(1136239445))
+  {} 1
+
 eval instant at 0m hour()
   {} 0
 
+eval instant at 0m hour(vector(1136239445))
+  {} 22
+
 eval instant at 0m minute()
   {} 0
 
+eval instant at 0m minute(vector(1136239445))
+  {} 4
+
 # 2008-12-31 23:59:59 just before leap second.
 eval instant at 0m year(vector(1230767999))
   {} 2008