anchor.diff:  library statistics_test;
   
   import 'package:statistics/statistics.dart';
  +
  +
  +const double DELTA = 0.0001;
   
   
   void test(Map options) {
  
positive.code:     var result;
      try {
        result = Function.apply(options['method'], args);
        if (result != expected) {
          throw new Exception('$f($args) failed but should have passed');
        }
      } on StatisticsException {
  
negative.code:     'args':[],
      'expect': {
        []: 'StatisticsException',
        [1, 2, 3]: 2,
        [1.0, 1.5, 1.6]: 1.366666,
        [1.0, -1.0, 2.0, -2.0]: 0
      }
    });
  }
  
  void main() {
    testMean();
  
    print('-------------------------------------');
    print('All tests complete.');
    print('-------------------------------------');
  }
  