public async Task Should_Throw_With_PreconditionFailed()
{
// Setup our Database and add a new Customer
var dbSetup = new DatabaseSetup(_client);
await dbSetup.Init(DatabaseId, CollectionId);
var addCustomer = new Customer(Guid.NewGuid().ToString(), "Demo");
await dbSetup.AddCustomer(addCustomer);
// Fetch out the Document (Customer)
var document = (from f in dbSetup.Client.CreateDocumentQuery(dbSetup.Collection.SelfLink)
where f.Id == addCustomer.Id
select f).AsEnumerable().FirstOrDefault();
// Cast the Document to our Customer & make a data change
var editCustomer = (Customer)(dynamic)document;
editCustomer.Name = "Changed";
// Using Access Conditions gives us the ability to use the ETag from our fetched document for optimistic concurrency.
var ac = new AccessCondition {
Condition = document.ETag, Type = AccessConditionType.IfMatch
};
// Replace our document, which will succeed with the correct ETag
await dbSetup.Client.ReplaceDocumentAsync(document.SelfLink, editCustomer,
new RequestOptions { AccessCondition = ac });
// Replace again, which will fail since our (same) ETag is now invalid
var ex = await dbSetup.Client.ReplaceDocumentAsync(document.SelfLink, editCustomer,
new RequestOptions { AccessCondition = ac }).ShouldThrowAsync <DocumentClientException>();
ex.StatusCode.ShouldBe(HttpStatusCode.PreconditionFailed);
}
