    @Test
    public void testDefaultNamespace() throws URISyntaxException {

        // test default namespace setting
        final ClientBuilder builder = Client.builder().endpoints(new URI("http://127.0.0.1:2379"));
        final ClientConnectionManager connectionManager = new ClientConnectionManager(builder);
        assertThat(connectionManager.getNamespace()).isEqualTo(ByteSequence.EMPTY);
    }