@@ -2,6 +2,7 @@ // Package assert provides testing helpers.
 package assert
 
 import (
+	"slices"
 	"strings"
 	"testing"
 
@@ -20,6 +21,21 @@ }
 	if expected != b.String() {
 		t.Fatalf(`expected "%v" but got "%v"`, expected, b.String())
 	}
+}
+
+// OneOf checks if the given expected list includes the rendered Node string.
+func OneOf(t *testing.T, expected []string, actual g.Node) {
+	t.Helper()
+
+	var b strings.Builder
+	err := actual.Render(&b)
+	if err != nil {
+		t.Fatal("error rendering actual:", err)
+	}
+	if slices.Contains(expected, b.String()) {
+		return
+	}
+	t.Fatalf(`expected one of "%v" but got "%v"`, expected, b.String())
 }
 
 // Error checks for a non-nil error.