anchor.diff:          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));
  +          var data =
  +              new List.generate(numberOfBytes, (x) => random.nextInt(255));
   
             // create test data
             for (int i = 0; i < data.length; i++) {
  
positive.code:     });
  
      test('writing to out-of-bounds memory a address causes a segfault', () {
        expect(() => vm.setMemoryValue(999, NumberType.uint8, 1), throwsSegfaultSignal);
        expect(() => vm.setMemoryValue(-1, NumberType.uint8, 1), throwsSegfaultSignal);
      });
  
      test('reading from out-of-bounds memory a address causes a segfault', () {
        expect(() => vm.readMemoryValue(999, NumberType.uint8), throwsSegfaultSignal);
        expect(() => vm.readMemoryValue(-1, NumberType.uint8), throwsSegfaultSignal);
      });
  
      test('executing instruction not in memory causes a segfault', () {
  
negative.code:       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)));
        });
      });
  
  