public static Gson instance() {
        return SingletonHolder.INSTANCE;
    }
@Test
    void configurationPropertyWithSecretParamsShouldSerializeResolvedValues() {
        ConfigurationProperty configurationProperty = new ConfigurationProperty(new ConfigurationKey("db_password"),
                new ConfigurationValue("{{SECRET:[test_id][password]}}"));
        configurationProperty.getSecretParams().get(0).setValue("secret");

        String json = Serialization.instance().toJson(configurationProperty);

        assertThat(json).isEqualTo("{\"key\":\"db_password\",\"value\":\"secret\"}");
    }