测试异常的单元测试 [英] unit tests that test for exceptions
问题描述
你好，
我正在尝试编写单元测试以测试抛出解析异常.由于抛出了解析异常，我该如何在单元测试中失败.
首先，这是引发解析异常的代码:
公共异步Task< int> ImportAsync(StreamReader reader，int projectId，IProgress< ParseProgress>进度)
{
...
var nodes = ParseData(progress);
如果(_errorMessages.Count> 0)
{
字符串fullErrorMessage = _errorMessages.Aggregate((x，y)=> x +"\ n" + y);
_errorMessages.Clear();
抛出新的ParsingException(string.Empty，fullErrorMessage);
}
...
}
此方法解析CSV文件中的数据.对ParseData(...)的调用实际上是在进行解析.每当它在解析过程中遇到问题时，就会将一条消息记录到_errorMessages中，即List< string>.错误消息.当它从ParseData(...)返回时，
它检查列表中的Count> 0.如果存在错误消息，它将引发ParseException，并将完整的错误消息列表(由'\ n'连接)作为异常消息.
我的单元测试使用以下方法开始设置:
受保护的重写无效When()
{
SUT.ImportAsync(TestData，1，new Progress< ParseProgress>()).Wait();
}
它传入TestData，其中包含一个moc CSV文件，其中一行包含我要测试的错误(即，当它击到该行时应抛出ParseException).
但是，此时会抛出ParseException的事实导致根据此设置失败的任何单元测试.
我该如何设置单元测试，以便在引发异常时不会失败，而实际上会检测在引发异常时将其识别为通过.
我该如何设置单元测试，以便在引发异常时不会失败，而实际上会检测在引发异常时将其识别为通过.
如果未引发预期的异常，则测试失败.如果引发了预期的异常，则测试通过.
Hello,
I'm trying to write unit tests to test throwing of parse exceptions. How can I do this with the unit test failing BECAUSE of the throwing of parse exceptions.
First of all, here is the code that throws the parse exception:
public async Task<int> ImportAsync(StreamReader reader, int projectId, IProgress<ParseProgress> progress)
{
...
var nodes = ParseData(progress);
if (_errorMessages.Count > 0)
{
string fullErrorMessage = _errorMessages.Aggregate((x, y) => x + "\n" + y);
_errorMessages.Clear();
throw new ParsingException(string.Empty, fullErrorMessage);
}
...
}
This method parses data from a CSV file. The call to ParseData(...) is what actually does the parsing. Whenever it encounters a problem during the parsing, it logs a message to _errorMessages, a List<string> of error messages. When it returns from ParseData(...),
it checks the list for Count > 0. If error messages exist, it throws a ParseException with the full list of error messages concatenated by '\n' as the exception message.
My unit tests begin their setup with the following method:
protected override void When()
{
SUT.ImportAsync(TestData, 1, new Progress<ParseProgress>()).Wait();
}
It passes in TestData which contains a moc CSV file, one row of which contains the error I'd like to test for (i.e. it should throw a ParseException when it hits this row).
But the fact that it throws a ParseException at this point results in any unit tests depending on this setup failing.
How can I setup unit tests such that rather than failing when exceptions are thrown, it actually detects when exceptions are thrown and recognizes this as a pass.
How can I setup unit tests such that rather than failing when exceptions are thrown, it actually detects when exceptions are thrown and recognizes this as a pass.
If the expected exception is not thrown, the test fails. If the expected exception is thrown, the test passes.
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