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c#tddnullreferenceexceptionfluent-assertions
Nick
Nick

Reputation: 6608

How to use Fluid Assertions .ShouldBeNull()

I am trying to use the Fluent Assertions ShouldBeNull() extension method to assert that my instance is indeed null.

Result.ShouldBeNull();

Clearly, this throws an exception because I cannot call the extension on a null instance.

System.NullReferenceException

How do I use Fluent Assertions properly to make this assertion?

Upvotes: 2

Views: 1431

Answers (3)

Stourme
Stourme

Reputation: 1

Result needs to be nullable

result?.Should().BeNull();

Even if you're checking for null, you're still trying to do an operation on a null value.

Upvotes: -1

Dennis Doomen
Dennis Doomen

Reputation: 8899

I wonder if you actually used FluentAssertions, because then your call should have looked like:

Result.Should().BeNull()

So with the dot .

Upvotes: 0

Cristian Lupascu
Cristian Lupascu

Reputation: 40566

Extension methods can be called on objects that are null.

See for example http://bradwilson.typepad.com/blog/2008/01/c-30-extension.html

Think of extension methods not as instance methods, but static methods that take the object (Result in your case) as a first parameter.

Upvotes: 6

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