C# ExpectedException 属性用法
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ExpectedException Attribute Usage
提问by Jonathan
I am trying to work with the ExpectedExceptionattribute in a C# UnitTest, but I am having issues getting it to work with my particular Exception. Here's what I got:
我正在尝试使用 a 中的ExpectedException属性C# UnitTest，但是我在让它与我的特定Exception. 这是我得到的：
NOTE:I wrapped asterisks around the line that is giving me the trouble.
注意：我在给我带来麻烦的行周围加上了星号。
[ExpectedException(typeof(Exception))]
public void TestSetCellContentsTwo()
{
// Create a new Spreadsheet instance for this test:
SpreadSheet = new Spreadsheet();
// If name is null then an InvalidNameException should be thrown. Assert that the correct
// exception was thrown.
ReturnVal = SpreadSheet.SetCellContents(null, "String Text");
**Assert.IsTrue(ReturnVal is InvalidNameException);**
// If text is null then an ArgumentNullException should be thrown. Assert that the correct
// exception was thrown.
ReturnVal = SpreadSheet.SetCellContents("A1", (String) null);
Assert.IsTrue(ReturnVal is ArgumentNullException);
// If name is invalid then an InvalidNameException should be thrown. Assert that the correct
// exception was thrown.
{
ReturnVal = SpreadSheet.SetCellContents("25", "String Text");
Assert.IsTrue(ReturnVal is InvalidNameException);
ReturnVal = SpreadSheet.SetCellContents("2x", "String Text");
Assert.IsTrue(ReturnVal is InvalidNameException);
ReturnVal = SpreadSheet.SetCellContents("&", "String Text");
Assert.IsTrue(ReturnVal is InvalidNameException);
}
}
I have the ExpectedExceptioncatching the base type Exception. Shouldn't this take care of it? I have tried using AttributeUsage, but it wasn't helping either. I know I can wrap it in a try/catch block, but I'd like to see if I can figure this style out.
我有ExpectedException捕捉基本类型Exception。这不应该管它吗？我试过使用AttributeUsage，但它也没有帮助。我知道我可以将它包装在 try/catch 块中，但我想看看我是否能弄清楚这种风格。
Thanks all!
谢谢大家！
采纳答案by Mick
It will fail unless the type of exception is exactly the type you've specified in the attribute e.g
除非异常类型正是您在属性中指定的类型，否则它将失败，例如
PASS:-
经过：-
[TestMethod()]
[ExpectedException(typeof(System.DivideByZeroException))]
public void DivideTest()
{
int numerator = 4;
int denominator = 0;
int actual = numerator / denominator;
}
FAIL:-
失败：-
[TestMethod()]
[ExpectedException(typeof(System.Exception))]
public void DivideTest()
{
int numerator = 4;
int denominator = 0;
int actual = numerator / denominator;
}
However this will pass ...
然而这会过去的...
[TestMethod()]
[ExpectedException(typeof(System.Exception), AllowDerivedTypes=true)]
public void DivideTest()
{
int numerator = 4;
int denominator = 0;
int actual = numerator / denominator;
}
