public void NullCannotBeAssertedToBeANonNullableType()
        {
            var expectedErrors = new EdmLibTestErrors()
            {
                { 6, 8, EdmErrorCode.NullCannotBeAssertedToBeANonNullableType }
            };

            this.VerifySemanticValidation(ExpressionValidationTestModelBuilder.NullForNonNullableTerm(this.EdmVersion), expectedErrors);
        }