Nested Folders: Add tests for store methods (#57662)

* Nested Folders: Add store tests

* Fix parent order

* Fix update

* skip tests!

* Export test helpers for now

pkg/util/reverse.go

@@ -0,0 +1,10 @@
+package util
+
+// Reverse returns a new slice with reversed order
+func Reverse[T comparable](input []T) []T {
+	output := make([]T, 0, len(input))
+	for i := len(input) - 1; i >= 0; i-- {
+		output = append(output, input[i])
+	}
+	return output
+}

pkg/util/reverse_test.go

@@ -0,0 +1,15 @@
+package util
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestReverse(t *testing.T) {
+	input := []int{1, 2, 3, 4, 5}
+
+	if diff := cmp.Diff([]int{5, 4, 3, 2, 1}, Reverse(input)); diff != "" {
+		t.Errorf("Result mismatch (-want +got):\n%s", diff)
+	}
+}