断言失败并在vb.net 2008中尝试

问题描述

此代码始终会正确失败.

< testmethod()> _
Public Sub AlwaysFails()
Assert.Fail(这总是失败")
结束子

但是，这永远不会失败，我认为是错误的:

< testmethod()> _
Public Sub NeverFails()
试试
Assert.Fail(这永远不会失败")
异常捕获

结束尝试
结束子

为什么?如果这是设计使然，那么我想我应该永远不要使用Assert.Fail.

This code always fails, correctly.

<testmethod()> _
Public Sub AlwaysFails()
Assert.Fail("this always fails")
End Sub

However, this never fails, incorrectly (in my opinion):

<testmethod()> _
Public Sub NeverFails()
Try
Assert.Fail("This never fails")
Catch ex As Exception

End Try
End Sub

Why? If this is by design, then I think I should probably never use Assert.Fail.

推荐答案

<br />
<TestMethod()> _<br />
Public Sub AlwaysPasses()<br />
Try<br />
  SubThatIsSupposedToThrowAnExceptionButDoesNot()<br />
  Assert.Fail("Sub did not throw an exception")<br />
Catch ex As Exception<br />
<br />
End Try<br />
End Sub<br />

但是以下代码将正常运行:

But the following code will work properly:

<br />
<TestMethod()> _<br />
Public Sub WorksCorrectly()<br />
Dim bolFailed as Boolean = False<br />
Try<br />
  SubThatIsSupposedToThrowAnExceptionButDoesNot()<br />
  bolFailed = True<br />
Catch ex As Exception<br />
<br />
End Try<br />
If bolFailed Then<br />
  Assert.Fail("Sub did not throw an exception")<br />
End If<br />
End Sub<br />

这意味着您在使用Assert.Fail时必须非常小心，因为它不会总是导致测试失败.如果Assert.Fail在try块内，则永远不会导致测试失败.

That means you have to be very careful about using Assert.Fail, because it will not always cause the test to fail. If Assert.Fail is within a try block, it will NEVER NEVER NEVER cause your test to fail.

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