LambdaTriggerStrategy implements TriggerStrategy { @Override public Set<String> getChannelIdentifiers() { return getChannelIdentifiersLambda.get(); } LambdaTriggerStrategy(
            SerializableFunction<MRecord, Boolean> isToBeTriggeredLambda,
            SerializableResultFunction<HashSet<String>> getChannelIdentifiersLambda); @Override boolean isToBeTriggered(MRecord values); @Override Set<String> getChannelIdentifiers();  }
@Test public void getChannelIdentifiers() { assertEquals(new HashSet<>(), strategy.getChannelIdentifiers()); assertEquals(new HashSet<>(), clone.getChannelIdentifiers()); }