assertEquals("bar", fieldConfigs.getConfig("foo").map(FieldConfigs.Config::getValues).orElse(new String[0])[0]);
    }

    @Test
    public void test_cache_true() {
        final Map<String, String> params = Maps.of("foo", "true");
        FieldConfigs fieldConfigs = new FieldConfigs(params);
        assertTrue(fieldConfigs.getConfig("test").isEmpty());