简而言之，在 dart 中进行单元测试时，throwsA(anything) 对我来说是不够的。如何测试特定的错误消息或类型？

这是我想捕捉的错误:

class MyCustErr implements Exception {
  String term;

  String errMsg() => 'You have already added a container with the id 
  $term. Duplicates are not allowed';

  MyCustErr({this.term});
}

这是当前通过的断言，但想检查上面的错误类型:

expect(() => operations.lookupOrderDetails(), throwsA(anything));

这就是我想做的:

expect(() => operations.lookupOrderDetails(), throwsA(MyCustErr));

最佳答案

这应该做你想做的:

expect(() => operations.lookupOrderDetails(), throwsA(isA<MyCustErr>()));

如果您只想检查异常，请查看 answer :

https://stackoverflow.com/questions/54241396/