ExpectedException xunit .net core

Question

I'm writing unit test for core application. Im trying to check, that my class throws exception. But ExpectedException attribute throws compile exception:

Error CS0246 The type or namespace name 'ExpectedException' could not be found (are you missing a using directive or an assembly reference?) EventMessagesBroker.Logic.UnitTests..NETCoreApp,Version=v1.0

My code:

[Fact]
[ExpectedException(typeof(MessageTypeParserException))]
public void TestMethod1_Error_twoMathces()
{
    var message = "some text";
    var parser = new MessageTypeParser();
    var type = parser.GetType(message);
    Assert.Equal(MessageType.RaschetStavkiZaNalichnye, type);
}

so, is there any correct way to achieve that?

Don't use xunit without reading xunit.github.io/docs/comparisons.html — Ruben Bartelink
– Ruben Bartelink, Commented Dec 24, 2016 at 9:38
3 years late...ExpectedException comes from MSTest Nuget...haven't had any luck cross-use that Nuget w/ Xunit — Johnny Wu
– Johnny Wu, Commented Jul 16, 2019 at 16:47

Dmitry · Accepted Answer · 2016-12-23 14:13:28Z

73

Use Assert.Throws on code where exception expected:

[Fact]
public void TestMethod1_Error_twoMathces()
{
    var message = "some text";
    var parser = new MessageTypeParser();
    Assert.Throws<MessageTypeParserException>(() => parser.GetType(message));
}

answered Dec 23, 2016 at 14:13

Dmitry

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3 Comments

Timur Lemeshko Over a year ago

yeap, i use this way. Think this is only solution

Michael A. Over a year ago

Just for the record, xunit does not support ExpectedException and supports the way shown in the answer. As described in more detail here: xunit.github.io/docs/comparisons.html If you wanted to follow the Triple A syntax for unit testing then you could assign parser.GetType(message) to an Action and assert that your action throws an exception.

Brij Over a year ago

We can also use Record.Exception method and later on verify using Assert.NotNull method and Assert.IsType<> method. See richard-banks.org/2015/07/…

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