c# - 带有catch的catch语句中的单元测试代码

Question

有没有一种方法可以在catch语句中测试代码，诀窍是catch以throw结尾，这就是问题的解决之道。因此，问题是，是否有一种方法可以避免在运行我的Test方法时抛出该异常，或者在我的测试中使其适应？

下面的方法只是简单地更新值，并且在捕获时具有throw

public void UpdateCase(LinqToSQLModelName record, IProgress<string> statusReporter)
        {

            try
            {
                statusReporter.Report(record.Reference);
                _service.PushToService(record);
                record.ProcessedDate = DateTime.Now;
                record.StatusId = (int)Status.Processed;
            }
            catch (Exception ex)
            {

                record.StatusId = (int)Status.Fail;
                record.ErrorExceptions = ex.StackTrace;
                record.ProcessedDate = DateTime.Now;
                Result = false;

                throw ex;//How do dodge this when running my test/ Accomodate it on my Test
            }
            finally
            {
                _db.SubmitChanges();
            }

        }

我需要现在测试捕获部分，在下面进行测试

 [TestMethod()]
        public void UpdateCaseErrorTest()
        {

            var repository = new Mock<IDataContext>();
            var errorLoggerRepository = new Mock<IExceptionLogger>();
            var serviceRepository = new Mock<IServiceInterface>();
            repository.Setup(m => m.Get()).Returns(new 
            ManualWithDrawDataContext());

            repository.Setup(m => m.GetCouncilRefundRecord())
             .Returns(new LinqToSQLModelName
             {
                 refrence= "10",
                 Reason = "Reason",
                 DateCaptured = DateTime.Now,

             });

            var sut = new DataContext(repository.Object.Get(), serviceRepository.Object, errorLoggerRepository.Object);

             sut.UpdateCase(repository.Object.GetCouncilRefundRecord(), null);//This null allows me to go to the catch

             Assert.IsFalse(sut.Result);
        }

Answer 1

不，您无法跳过catch的throw语句。但是，您可以在单元测试方法上附加ExpectedExceptionAttribute，以表明在执行测试方法期间可能会出现异常。您可以在here上了解有关ExpectedExceptionAttribute的信息。

    [TestMethod()]
    [ExpectedException(typeof(Exception))]
    public void UpdateCaseErrorTest()
    {

        var repository = new Mock<IDataContext>();
        var errorLoggerRepository = new Mock<IExceptionLogger>();
        var serviceRepository = new Mock<IServiceInterface>();
        repository.Setup(m => m.Get()).Returns(new 
        ManualWithDrawDataContext());

        repository.Setup(m => m.GetCouncilRefundRecord())
         .Returns(new LinqToSQLModelName
         {
             refrence= "10",
             Reason = "Reason",
             DateCaptured = DateTime.Now,

         });

        var sut = new DataContext(repository.Object.Get(), serviceRepository.Object, errorLoggerRepository.Object);

         sut.UpdateCase(repository.Object.GetCouncilRefundRecord(), null);//This null allows me to go to the catch

         Assert.IsFalse(sut.Result);
    }

另外，我建议不要捕获一般异常，而应定义具有特定异常的属性。