@Test public void observeNetworkConnectivityWithStrategyShouldNotBeNull() {

  // given
  final Context context = RuntimeEnvironment.application;
  NetworkObservingStrategy strategy = new LollipopNetworkObservingStrategy();
  // when
  Observable<Connectivity> observable;
  observable = ReactiveNetwork.observeNetworkConnectivity(context, strategy);
  // then
  assertThat(observable).isNotNull();
}