diff --git a/tests/all.test b/tests/all.test
index b45132ea..f70979cc 100644
--- a/tests/all.test
+++ b/tests/all.test
@@ -676,6 +676,10 @@ indices([1,2])
 [0,1,2,3,1,4,2,5,1,2,6,7]
 [1,8]
 
+indices([1,2])
+[1]
+[]
+
 indices(", ")
 "a,b, cd,e, fgh, ijkl"
 [3,9,14]