### Question:
BackoffHelper { public BackoffStrategy getBackoffStrategy() { return backoffStrategy; } BackoffHelper();  BackoffHelper(Amount<Long, Time> initialBackoff, Amount<Long, Time> maxBackoff);  BackoffHelper(BackoffStrategy backoffStrategy); @VisibleForTesting  BackoffHelper(Clock clock, BackoffStrategy backoffStrategy); void doUntilSuccess(final ExceptionalSupplier<Boolean, E> task); BackoffStrategy getBackoffStrategy(); T doUntilResult(ExceptionalSupplier<T, E> task);  }### Answer:
@Test public void testGetBackoffStrategy() { control.replay(); assertEquals(backoffStrategy, backoffHelper.getBackoffStrategy()); }