### Question:
NameToBeDefined2 implements Callable<V> { public void handle(Consumer<Throwable> consumer) { try { callable.call(); } catch (Throwable t) { consumer.accept(t); } } protected  NameToBeDefined2(Callable<V> callableToDecorate); static NameToBeDefined2<V> wrap(final Callable<V> callableToDecorate); NameToBeDefined2<V> retryOnBusy(); NameToBeDefined2<V> retryOnBusy(final long delayMillis); NameToBeDefined2<V> retryOnBusy(final long... delayMillis); NameToBeDefined2<V> retryOnBusy(final long delayMillis, final int retryTimes); NameToBeDefined2<V> retryOnError(final long delayMillis, final EdsdkError errors); NameToBeDefined2<V> retryOnError(final long delayMillis, final EdsdkError... errors); NameToBeDefined2<V> retryOnError(final long delayMillis, final int retryTimes, final EdsdkError errors); NameToBeDefined2<V> retryOnError(final long delayMillis, final int retryTimes, final EdsdkError... errors); NameToBeDefined2<V> retryOnError(final long delayMillis, final int retryTimes, final List<EdsdkError> errors); NameToBeDefined2<V> runOnError(final Callable<V> runOnError, final EdsdkError error); NameToBeDefined2<V> runOnError(final Callable<V> runOnError, final EdsdkError... errors); NameToBeDefined2<V> runOnError(final Callable<V> runOnError, final List<EdsdkError> errors); @Override V call(); void handle(Consumer<Throwable> consumer); V handle(Function<Throwable, V> function); R handle(BiFunction<V, Throwable, R> function);  }### Answer:
@Test void handle() { final AtomicBoolean bo = new AtomicBoolean(false); throwRuntime .handle(throwable -> { bo.set(true); }); Assertions.assertTrue(bo.get()); countOnly .handle(throwable -> { bo.set(false); }); Assertions.assertTrue(bo.get()); }
@Test void handleWithReturnValue() { final Boolean handle = (Boolean) throwRuntime .handle(throwable -> true); Assertions.assertTrue(handle); final int count = (int) countOnly .handle(throwable -> true); Assertions.assertEquals(this.count.get() - 1, count); }
@Test void handleWithBiFunction() { final Boolean handle = (Boolean) countOnly .handle((value, throwable) -> false); Assertions.assertFalse(handle); final Boolean handle2 = (Boolean) throwRuntime .handle((value, throwable) -> true); Assertions.assertTrue(handle2); }