NUnit-测试失败后进行清理 [英] NUnit - cleanup after test failure

问题描述

我们有一些访问数据库的NUnit测试。当其中一个失败时，它可能会使数据库处于不一致的状态-这不是问题，因为我们为每个测试运行都重建数据库-但这可能导致其他测试在同一运行中失败。

We have some NUnit tests that access the database. When one of them fails it can leave database in inconsistent state - which is not an issue, since we rebuild database for every test run - but it can cause other tests to fail in the same run.

是否有可能检测到其中一个测试失败并执行某种清理？

Is it possible to detect that one of the tests failed and perform some sort of cleanup?

我们不想在每个测试中都编写清理代码测试，我们已经这样做了。我想在Teardown中执行清除操作，但只有在测试失败的情况下才能执行，因为清除操作可能会很昂贵。

We don't want to write cleanup code in every test, we already do that now. I'd like to perfrom cleanup in Teardown but only if test failed, as cleanup might be expensive.

更新：澄清一下-我会像测试一样简单，并且不包含任何清理或错误处理逻辑。我也不想在每次测试运行时都执行数据库重置-仅在测试失败的情况下。而且此代码可能应该在Teardown方法中执行，但是如果我们当前正在从失败或成功的测试中删除，我不知道有什么方法可以获取信息。

Update: To clarify - I would like tests to be simple and NOT include any cleanup or error handling logic. I also don't want to perform database reset on every test run - only if test fails. And this code should probably be executed in Teardown method but I am not aware of any way to get info if test we are currently tearing down from failed or was successful.

Update2 ：

        [Test]
        public void MyFailTest()
        {
            throw new InvalidOperationException();
        }

        [Test]
        public void MySuccessTest()
        {
            Assert.That(true, Is.True);
        }

        [TearDown]
        public void CleanUpOnError()
        {
            if (HasLastTestFailed()) CleanUpDatabase();
        }

我正在寻找HasLastTestFailed（）的实现

I am looking for implementation of HasLastTestFailed()

推荐答案

这个想法引起了我的兴趣，因此我做了一些深入的研究。 NUnit没有开箱即用的功能，但是NUnit提供了一个完整的可扩展性框架。我发现这篇关于扩展NUnit的伟大文章-这是一个很好的起点。经过测试之后，我想出了以下解决方案：如果夹具中的一项测试失败，则将调用一个用自定义 CleanupOnError 属性修饰的方法。

This idea got me interested, so I did a little digging. NUnit doesn't have this ability out of the box, but there is a whole extensibility framework supplied with NUnit. I found this great article about extending NUnit - it was a good starting point. After playing around with it, I came up with the following solution: a method decorated with a custom CleanupOnError attribute will be called if one of the tests in the fixture failed.

这是测试的样子：

  [TestFixture]
  public class NUnitAddinTest
  {
    [CleanupOnError]
    public static void CleanupOnError()
    {
      Console.WriteLine("There was an error, cleaning up...");
      // perform cleanup logic
    }

    [Test]
    public void Test1_this_test_passes()
    {
      Console.WriteLine("Hello from Test1");
    }

    [Test]
    public void Test2_this_test_fails()
    {
      throw new Exception("Test2 failed");
    }

    [Test]
    public void Test3_this_test_passes()
    {
      Console.WriteLine("Hello from Test3");
    }
  }

其中的属性很简单：

  [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
  public sealed class CleanupOnErrorAttribute : Attribute
  {
  }

这是从插件执行的方式：

And here is how it's executed from the addin:

public void RunFinished(TestResult result)
{
  if (result.IsFailure)
  {
    if (_CurrentFixture != null)
    {
      MethodInfo[] methods = Reflect.GetMethodsWithAttribute(_CurrentFixture.FixtureType,
                                                             CleanupAttributeFullName, false);
      if (methods == null || methods.Length == 0)
      {
        return;
      }

      Reflect.InvokeMethod(methods[0], _CurrentFixture);
    }
  }
}

但这是棘手的部分：插件必须放置在NUnit运行器旁边的 addins 目录中。矿井位于TestDriven.NET目录中的NUnit运行器旁边：

But here's the tricky part: the addin must be placed in the addins directory next to the NUnit runner. Mine was placed next to the NUnit runner in TestDriven.NET directory:

C：\Program Files\ TestDriven.NET 2.0\NUnit\addins

（我创建了插件目录，它不在那里）

(I created the addins directory, it wasn't there)

编辑另一件事是，清理方法需要 static ！

EDIT Another thing is that the cleanup method needs to be static!

我砍在一起是一个简单的插件，您可以从我的SkyDrive 。您将必须添加对 nunit.framework.dll ， nunit.core.dll 和 nunit.core.interfaces.dll 放在适当的位置。

I hacked together a simple addin, you can download the source from my SkyDrive. You will have to add references to nunit.framework.dll, nunit.core.dll and nunit.core.interfaces.dll in the appropriate places.

一些注意事项：属性类可以放在代码中的任何位置。我不想将其与插件本身放置在同一程序集中，因为它引用了两个 Core NUnit程序集，因此我将其放置在其他程序集中。如果您决定将它放置在其他任何地方，只需记住在 CleanAddin.cs 中更改该行即可。

A few notes: The attribute class can be placed anywhere in your code. I didn't want to place it in the same assembly as the addin itself, because it references two Core NUnit assemblies, so I placed it in a different assembly. Just remember to change the line in the CleanAddin.cs, if you decide to put it anywhere else.

希望会有所帮助。

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