### Question:
CoapProtocolClientFactory implements ProtocolClientFactory { @Override public CoapProtocolClient getClient() { return new CoapProtocolClient(executor); } CoapProtocolClientFactory(); @Override String toString(); @Override String getScheme(); @Override CoapProtocolClient getClient();  }### Answer:
@Test public void getClient() { assertThat(new CoapProtocolClientFactory().getClient(), instanceOf(CoapProtocolClient.class)); }