Replacement for MatchType?

Question

The new NUnit Version 3.x does not support ExpectedExceptionAttribute any longer. There is an Assert.Throws<MyException>() instead. Probably a better logical concept. But I failed to find any replacement for the old good MatchType - is there any? MyException can be thrown with a number of parameters, in NUnit 2.x I could compare the exception message for the containment of a certain text fragment to know which parameter was used (and, certainly, I am not going to have dozens of exception classes instead of the just logical one). How can this be handled with NUnit 3.x? I was unable to find a hint.

With NUnit 2.x, I would do the following:

[Test]
[ExpectedException(ExpectedException=typeof(MyException),  ExpectedMessage="NON_EXISTENT_KEY", MatchType=MessageMatch.Contains)]
public void DeletePatient_PatientExists_Succeeds()
 {
    Person p    = new Person("P12345", "Testmann^Theo", new DateTime(1960, 11, 5), Gender.Male);
    MyDatabase.Insert(p);

    MyDatabase.Delete(p.Key);

    // Attemp to select from a database with a non-existent key.
    // MyDatabase throws an exception of type MyException with "NON_EXISTENT_KEY" within the message string,
    // so that I can distinguish it from cases where MyException is thrown with different message strings.
    Person p1   = MyDatabase.Select(p.Key);
 }

How can I do anything similar with NUnt 3.x?

Please consider what I mean: the means that NUnit provides for, are not sufficient to recognize the parameters with which the exception was thrown, so this is a different question.

It would really help if you'd show a clear example of a test you're trying to port. Your situation is unclear to me at the moment. — Jon Skeet
– Jon Skeet, Commented Feb 6, 2017 at 12:34
Please edit your question with a minimal reproducible example instead of putting it in comments. — Jon Skeet
– Jon Skeet, Commented Feb 6, 2017 at 12:41
Possible duplicate of Should I use nunit's Assert.Throws method or Expected Exception attribute? — Raman Tsitou
– Raman Tsitou, Commented Feb 6, 2017 at 13:46

Raman Tsitou · Accepted Answer · 2017-02-06 13:31:49Z

2

var ex = Assert.Throws<MyException>(()=> MyDatabase.Select(p.Key));
StringAssert.Contains("NON_EXISTENT_KEY", ex.Message);

edited Feb 6, 2017 at 13:31

answered Feb 6, 2017 at 13:25

Raman Tsitou

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5 Comments

Alex Konnen Over a year ago

I do not understand what you mean.

Raman Tsitou Over a year ago

Assert.Throws check thrown exception of expected type, and returns instance of the exception. In next line StringAssert checks, if expected string contains in Exception.Message. Exactly the same result as in your comment by FluentAssertions, but everything by NUnit 3.

Alex Konnen Over a year ago

OK, I may have misunderstood StringAssert.

Raman Tsitou Over a year ago

More info about StringAssert in NUnit 3: github.com/nunit/docs/wiki/String-Assert

Eric Fossum Over a year ago

In my case, Google sent me here and I didn't know what MatchType did (updating old code). Would have been nice to get an explanation that connected MatchType and StringAssert.Contains.

Alex Konnen · Accepted Answer · 2017-02-06 13:10:51Z

-1

As it looks, a possibility does exist (and even a sharper one than the aforementioned) to provide for this functionality, albeit not in NUnit 3 itself, but in FluentAssertions (http://www.fluentassertions.com/). There, you can do things like

 Action act = () => MyDatabase.Select(p.Key);
 act.ShouldThrow<MyException>().Where(ex => ex.Message.Contains("NON_EXISTENT_KEY"));

For all my practical purposes this solves the problem.

answered Feb 6, 2017 at 13:10

Alex Konnen

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