t.Fatal("Unmarshal: ", err)
	} else if len(jk.Keys) != 3 {
		t.Fatalf("Expected 3 keys, got %d", len(jk.Keys))
	}

	var kids []string
	for ii, jks := range jk.Keys {
		_, err := jks.DecodePublicKey()
		if err != nil {
			t.Fatalf("Failed to decode key %d: %v", ii, err)
		}
		kids = append(kids, jks.Kid)
	}
	if len(kids) != 3 {
		t.Fatalf("Failed to find the expected number of kids: 3, got %d", len(kids))