Is there a more elegant way to do this test?

[Lukas]

Normally you test, if an exception gets thrown in a certain method, as follows. 

I use FluentAssertions:

        [Fact]
        public void Exception_gets_thrown()
        {
            var foo = new Foo("validArgument");
 
            foo.Invoking(f => f.Bar(null))		// null is an invalid argument
               .ShouldThrow<ArgumentNullException>();
        }



But how to test if an exception gets thrown in the constructor. 
I just did it like this, but is there maybe a more appropriate way
via FluentAssertions?

        [Fact]
        public void Constructor_throws_Exception()
        {
            Action a = () => new Foo(null);		// null is an invalid argument
            a.ShouldThrow<ArgumentNullException>();
        }

[Ricky]

Hi Lukas,

Thanks again for bringing up the question. 

If you just want to test if a constructor throws an exception, you can use Assert.Throws/ExepectedException to check if the constructor is throwing the expected exception.

However, if you rather intend to mock the constructor you can easily do it by this line:

var  foo = Mock.Create<Foo>(Constructor.Mocked);

 

Kind Regards
Ricky
the Telerik team