在Try..Catch断言中被捕获 [英] Assert in Try..Catch block is caught

问题描述

只是遇到了一些有趣的行为-Assert被Catch块捕获.

Just came across some interesting behavior - Assert being caught by Catch block.

List<Decimal> consArray = new List<decimal>();
try
{
    Decimal d;
    Assert.IsTrue(Decimal.TryParse(item.Value, out d));
    consArray.Add(d);
}
catch (Exception e)
{
     Console.WriteLine(item.Value);
     Console.WriteLine(e);
}

声明抛出AssertFailedException并被catch捕获.一直认为，如果Assert失败，则测试将失败，并且连续执行将中止.但在那种情况下-测试会继续进行.如果以后没有发生任何错误-我会得到绿色测试！从理论上讲-这是正确的行为吗?

Assert throws AssertFailedException and its caught by catch. Always thought that if Assert fails then test is failed and consecutive execution is aborted. But in that case - test moves along. If nothing wrong happens later - I get green test! In theory - is it right behavior?

我了解也许是.NET限制以及MsTest中的断言是如何产生的.断言引发异常.由于catch-捕获了所有捕获的断言异常.但是理论上正确还是MsTest特定?

Edited: I understand that maybe it is .NET restriction and how asserts are made in MsTest. Assert throws exception. Since catch - catches everything it catches assert exception. But is it right in theory or MsTest specific?

推荐答案

NUnit将执行完全相同的操作.我认为应该和其他测试框架一样，但是我只知道C#中的MStest和NUnit.

NUnit will do the exact same thing. As should any other test framework I think, but I only know MStest and NUnit in C#.

我希望您的测试代码不包含Decimal.TryParse，但是您的业务逻辑会这样做，您将使用对象和方法调用进行测试.

I'd expect that your test code would not contain Decimal.TryParse, but your business logic would do that, which you'd test with an object and a method call.

类似的东西:

var sut = new Sut();
var d = sut.DoSomethingThatReturnsTheDecimal(item.Value);

Assert.AreEqual(0.123, d, string.Format("passed value can not be parsed to decimal ({0})", item.Value);

为了与您的实现更接近一点:

In order to stay a bit closer to your implementation:

List<Decimal> consArray = new List<decimal>();

Decimal d = Decimal.MinValue;

// You don't need to try-catch a Decimal.TryParse
// Decimal.TryParse(item.Value, out d));

try
{
    d = Decimal.Parse(item.Value)
}
catch
{
    // Handle exception
}

Assert.AreEqual(0.123, d);

// Does the list add anything at all? In this sample it seems a bit redundant
consArray.Add(d);

无论如何，回答您的问题.尝试捕获应该捕获您的AssertFailedException.

Anyway, to answer your question. The try-catch is supposed to catch your AssertFailedException.

PS:捕捉AsserFailedException并将其重新抛出也可以，但是对我来说有点奇怪.我努力将Assert放在任何try-catch块之外.但这可能只是我的意见，您并没有要求:).

PS: Catching the AsserFailedException and re-throwing it will also work, but it feels a bit strange to me. I'd strive to leave the Asserts outside any try-catch blocks. But that might be just my opinion which you didn't ask for :).

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