FluentValidation - ServiceStack 5.4.0

ServiceStack Validation
1

I’m getting the following error when attempting to unit test some of the my validator

Error	CS0121	The call is ambiguous between the following methods or properties: 'ValidationTestExtension.ShouldHaveValidationErrorFor<T, TValue>(IValidator<T>, Expression<Func<T, TValue>>, TValue, string)' and 'ValidationTestExtension.ShouldHaveValidationErrorFor<T, TValue>(IValidator<T>, Expression<Func<T, TValue>>, T, string)'

I’ve replicated this issue by creating a new SS template from VS , adding a validator class and attempting to call the following code in a unit test method.

 var validator = new UserValidaton();
 validator.ShouldHaveValidationErrorFor(x => x.Name, null, null );
2

This is a standard C# error, it can’t tell which method you’re trying to call because the null argument makes the call ambiguous, so cast null e.g. (T)null to the argument of the method you want to call.