### Question:
PingNetServiceDiscoveryComponent implements ResourceDiscoveryComponent, ManualAddFacet { @Override public Set discoverResources(ResourceDiscoveryContext resourceDiscoveryContext) throws InvalidPluginConfigurationException, Exception { return Collections.emptySet(); }  @Override Set discoverResources(ResourceDiscoveryContext resourceDiscoveryContext); @Override DiscoveredResourceDetails discoverResource(Configuration config,
        ResourceDiscoveryContext resourceDiscoveryContext);  }### Answer:
@Test public void testDiscoverResources() throws Exception { assertEquals(0, pingNetServiceDiscoveryComponent.discoverResources(null).size()); }