### Question:
Retryer { public <T> ForReturnValue<T> uponReturn( T returnValue, Stream<? extends Delay<? super T>> delays) { return uponReturn(returnValue, copyOf(delays)); } Retryer(); private  Retryer(ExceptionPlan<Delay<?>> plan); final Retryer upon(
      Class<E> exceptionType, List<? extends Delay<? super E>> delays); final Retryer upon(
      Class<E> exceptionType, Stream<? extends Delay<? super E>> delays); Retryer upon(
      Class<E> exceptionType, Predicate<? super E> condition,
      List<? extends Delay<? super E>> delays); Retryer upon(
      Class<E> exceptionType, Predicate<? super E> condition,
      Stream<? extends Delay<? super E>> delays); T retryBlockingly(CheckedSupplier<T, E> supplier); CompletionStage<T> retry(
      CheckedSupplier<T, ?> supplier, ScheduledExecutorService executor); CompletionStage<T> retryAsync(
      CheckedSupplier<? extends CompletionStage<T>, ?> asyncSupplier,
      ScheduledExecutorService executor); ForReturnValue<T> ifReturns(
      Predicate<T> condition, List<? extends Delay<? super T>> delays); ForReturnValue<T> ifReturns(
      Predicate<T> condition, Stream<? extends Delay<? super T>> delays); ForReturnValue<T> uponReturn(
      T returnValue, Stream<? extends Delay<? super T>> delays); ForReturnValue<T> uponReturn(
      T returnValue, List<? extends Delay<? super T>> delays);  }### Answer:
@Test public void testForReturnValue_nulls() { new NullPointerTester() .testAllPublicInstanceMethods(new Retryer().uponReturn("bad", asList())); }