public virtual void Detects_invalid_concurrency_token()
{
var modelBuilder = CreateConventionalModelBuilder();
modelBuilder.Entity <Customer>()
.ToContainer("Orders")
.Property <string>("_not_etag")
.IsConcurrencyToken();
var model = modelBuilder.Model;
VerifyError(CosmosStrings.NonEtagConcurrencyToken(typeof(Customer).Name, "_not_etag"), model);
}