diff --git a/tpl/collections/index_test.go b/tpl/collections/index_test.go
index fdc66a0ae..6e9071aba 100644
--- a/tpl/collections/index_test.go
+++ b/tpl/collections/index_test.go
@@ -37,6 +37,9 @@ func TestIndex(t *testing.T) {
 		{[][]int{{1, 2}, {3, 4}}, []interface{}{0, 0}, 1, false},
 		{map[int]int{1: 10, 2: 20}, []interface{}{1}, 10, false},
 		{map[int]int{1: 10, 2: 20}, []interface{}{0}, 0, false},
+		{map[string]map[string]string{"a": {"b": "c"}}, []interface{}{"a", "b"}, "c", false},
+		{[]map[string]map[string]string{{"a": {"b": "c"}}}, []interface{}{0, "a", "b"}, "c", false},
+		{map[string]map[string]interface{}{"a": {"b": []string{"c", "d"}}}, []interface{}{"a", "b", 1}, "d", false},
 		// errors
 		{nil, nil, nil, true},
 		{[]int{0, 1}, []interface{}{"1"}, nil, true},