anchor.diff:        test('throws HaltSignal with exit code from stack', () {
           vm.pushStack(NumberType.uint32, 156);
           encodeInstruction(new HaltInstruction());
  -        expect(vm.executeNextInstruction, throwsA(predicate(
  -            (signal) => signal is HaltSignal && signal.statusCode == 156)));
  +        expect(
  +            vm.executeNextInstruction,
  +            throwsA(predicate(
  +                (signal) => signal is HaltSignal && signal.statusCode == 156)));
         });
       });
   
  
positive.code:         test('fetches memory chunks of $numberOfBytes bytes', () {
            var random = new Random(numberOfBytes);
            var dataAddress = random.nextInt(200);
            var data = new List.generate(numberOfBytes,
                (x) => random.nextInt(255));
  
            // create test data
            for (int i = 0; i < data.length; i++) {
  
negative.code:         test('moves memory chunks of $numberOfBytes bytes', () {
            var random = new Random(numberOfBytes);
            var dataAddress = random.nextInt(200);
            var data =
                new List.generate(numberOfBytes, (x) => random.nextInt(255));
  
            // create test data
            for (int i in data.reversed) {
  