extraNotNil := pkix.Name{
		Locality:   []string{"Gophertown"},
		ExtraNames: extra[:0],
		Names: []pkix.AttributeTypeAndValue{
			{Type: asn1.ObjectIdentifier([]int{1, 2, 3, 4, 5}), Value: "golang.org"}},
	}

	tests := []struct {
		dn   pkix.Name
		want string
	}{
		{nn, "L=Gophertown,1.2.3.4.5=#130a676f6c616e672e6f7267"},
		{extraNotNil, "L=Gophertown"},
		{pkix.Name{