CompositeLogger implements Logger<M, E, F> { @Override public void beforeInit(M model) { for (Logger<M, E, F> logger : loggers) { logger.beforeInit(model); } } private  CompositeLogger(List<Logger<M, E, F>> loggers); @SafeVarargs static Logger<M, E, F> from(Logger<M, E, F> logger, Logger<M, E, F>... loggers); @Override void beforeInit(M model); @Override void afterInit(M model, First<M, F> result); @Override void exceptionDuringInit(M model, Throwable exception); @Override void beforeUpdate(M model, E event); @Override void afterUpdate(M model, E event, Next<M, F> result); @Override void exceptionDuringUpdate(M model, E event, Throwable exception);  }
@Test public void delegatesBeforeInitToAllLoggers() { BeforeInit<String> testCase = BeforeInit.create("Hello"); underTest.beforeInit(testCase.model()); assertTestCaseLogged(testCase); }