### Question:
TupleEntrySchemeIterator extends TupleEntryIterator { @Override public boolean hasNext() { if( currentException != null ) return true; if( isComplete ) return false; if( hasWaiting ) return true; try { getNext(); } catch( Exception exception ) { if( permittedExceptions.contains( exception.getClass() ) ) { LOG.warn( "Caught permitted exception while reading {}", loggableIdentifier.get(), exception ); return false; } currentException = new TupleException( "unable to read from input identifier: " + loggableIdentifier.get(), exception ); return true; } if( !hasWaiting ) isComplete = true; return !isComplete; } @Deprecated  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Scheme scheme, Input input ); @Deprecated  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Scheme scheme, Input input, String loggableIdentifier ); @Deprecated  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Scheme scheme, CloseableIterator<Input> inputIterator ); @Deprecated  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Scheme scheme, CloseableIterator<Input> inputIterator, String loggableIdentifier );  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Tap tap, Scheme scheme, Input input );  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Tap tap, Scheme scheme, Input input, String loggableIdentifier );  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Tap tap, Scheme scheme, Input input, Supplier<String> loggableIdentifier );  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Tap tap, Scheme scheme, CloseableIterator<Input> inputIterator );  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Tap tap, Scheme scheme, CloseableIterator<Input> inputIterator, String loggableIdentifier );  TupleEntrySchemeIterator( FlowProcess<? extends Config> flowProcess, Tap tap, Scheme scheme, CloseableIterator<Input> inputIterator, Supplier<String> loggableIdentifier ); @Override boolean hasNext(); @Override TupleEntry next(); @Override void remove(); @Override void close();  }### Answer:
@Test public void testHasNextWithException() throws Exception { FlowProcess<?> flowProcess = FlowProcess.NULL; Scheme<?, ?, ?, ?, ?> scheme = new MockedScheme(); CloseableIterator<Object> inputIterator = new MockedSingleValueCloseableIterator( new Object() ); TupleEntrySchemeIterator<?, ?> iterator = new TupleEntrySchemeIterator( flowProcess, null, scheme, inputIterator ); assertTrue( iterator.hasNext() ); assertTrue( iterator.hasNext() ); }