@Test
public void testConfig() {

  KafkaSenderExporter exporter = new KafkaSenderExporter();
  Map<String, String> properties = new HashMap<String, String>();
  properties.put("kafka.myprop", "myvalue");
  BundleContext context = mock(BundleContext.class);
  Config config = mock(Config.class);
  when(config.bootstrapServers()).thenReturn("server1");
  when(config.encoding()).thenReturn(Encoding.JSON);
  when(config.topic()).thenReturn("mytopic");
  exporter.activate(config, context, properties);
}