public void GetAcrValues_should_return_snapshot_of_values() { var request = new ValidatedAuthorizeRequest() { Raw = new System.Collections.Specialized.NameValueCollection() }; request.AuthenticationContextReferenceClasses.Add("a"); request.AuthenticationContextReferenceClasses.Add("b"); request.AuthenticationContextReferenceClasses.Add("c"); var acrs = request.GetAcrValues(); foreach (var acr in acrs) { request.RemoveAcrValue(acr); } }