public List<X509Certificate> operatorCertificates() {
        return operatorCertificates;
    }
@Test
    public void testOperatorCertificates() throws IOException {
        Slime slime = SlimeUtils.jsonToSlime(json);
        Cursor cursor = slime.get();
        Cursor array = cursor.setArray(PrepareParams.OPERATOR_CERTIFICATES);
        X509Certificate certificate = X509CertificateUtils.createSelfSigned("cn=myservice", Duration.ofDays(1)).certificate();
        array.addString(X509CertificateUtils.toPem(certificate));
        PrepareParams prepareParams = PrepareParams.fromJson(SlimeUtils.toJsonBytes(slime), TenantName.from("foo"), Duration.ofSeconds(60));
        assertEquals(1, prepareParams.operatorCertificates().size());
        assertEquals(certificate, prepareParams.operatorCertificates().get(0));
    }