如何使用内部异常对代码进行单元测试?

时间:2011-04-23 13:16:09

标签: c# .net unit-testing moles inner-exception

我想对以下代码进行一些单元测试:

public static class ExceptionExtensions {
   public static IEnumerable<Exception> SelfAndAllInnerExceptions(
      this Exception e) {
      yield return e;
      while (e.InnerException != null) {
         e = e.InnerException; //5
         yield return e; //6
      }
   }
}

编辑:看来我不需要Moles来测试这段代码。另外,我遇​​到了第5和第6行颠倒的错误。

1 个答案:

答案 0 :(得分:3)

这就是我得到的(之后不需要Moles):

[TestFixture]
public class GivenException
{
   Exception _innerException, _outerException;

   [SetUp]
   public void Setup()
   {
      _innerException = new Exception("inner");
      _outerException = new Exception("outer", _innerException);
   }

   [Test]
   public void WhenNoInnerExceptions()
   {
      Assert.That(_innerException.SelfAndAllInnerExceptions().Count(), Is.EqualTo(1));
   }

   [Test]
   public void WhenOneInnerException()
   {
      Assert.That(_outerException.SelfAndAllInnerExceptions().Count(), Is.EqualTo(2));
   }

   [Test]
   public void WhenOneInnerException_CheckComposition()
   {
      var exceptions = _outerException.SelfAndAllInnerExceptions().ToList();
      Assert.That(exceptions[0].InnerException.Message, Is.EqualTo(exceptions[1].Message));
   }
}