assertFalse(fieldConfigs.getConfig("foo").map(FieldConfigs.Config::isOverwrite).orElse(false));
    }

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