dart - 即使满足了期望，测试也失败了

Question

我有一个看起来像这样的测试：

test('should throw error if threshold is null', (){
  final findEngine = new FindEngine<Foo>();
  expect(findEngine.streamResults('foo', null), throwsA(new
      isInstanceOf<ThresholdNullOrOutOfBoundsError>()));
});

测试失败并显示以下消息：

ERROR: should throw error if threshold is null
  Test failed: Caught Instance of 'ThresholdNullOrOutOfBoundsError'

我在这里做错了吗？

Answer 1

弄清楚了。需要关闭我预计会失败的呼叫：

expect(() => findEngine.streamResults('foo', null), throwsA(new
  isInstanceOf<ThresholdNullOrOutOfBoundsError>()));