@Test
public void testLookup() {

    final Subscription existingSubscription = clientSubOnTopic("TempSensor1", "/temp");
    sut.add(existingSubscription);
    //Exercise
    final Optional<CNode> matchedNode = sut.lookup(asTopic("/humidity"));
    //Verify
    assertFalse("Node on path /humidity can't be present", matchedNode.isPresent());
}