diff --git a/nip54/nip54_test.go b/nip54/nip54_test.go
index e540e46..69393cc 100644
--- a/nip54/nip54_test.go
+++ b/nip54/nip54_test.go
@@ -1,10 +1,28 @@
 package nip54
 
 import (
+	"fmt"
 	"strings"
 	"testing"
 )
 
+func TestNormalization(t *testing.T) {
+	for _, vector := range []struct {
+		before string
+		after  string
+	}{
+		{" hello  ", "hello"},
+		{"Goodbye", "goodbye"},
+		{"the long and winding road / that leads to your door", "the-long-and-winding-road---that-leads-to-your-door"},
+		{"it's 平仮名", "it-s-平仮名"},
+	} {
+		if norm := NormalizeIdentifier(vector.before); norm != vector.after {
+			fmt.Println([]byte(vector.after), []byte(norm))
+			t.Fatalf("%s: %s != %s", vector.before, norm, vector.after)
+		}
+	}
+}
+
 func TestArticleAsHTML(t *testing.T) {
 	tests := []struct {
 		name     string