public async Task When_DeleteByIdAsync() { // Arrange var cosmosDatabase = _cosmosClient.GetDatabase( _configuration["AzureCosmosDocumentStoreOptions:DatabaseId"]); var cosmosContainer = cosmosDatabase.GetContainer("accounts"); var accountData = new AccountData( _faker.Random.Number(10000, 99999).ToString()); accountData.SystemOfRecord = _faker.PickRandom( AccountData.SYSTEMOFRECORD_AUTOSUITE, AccountData.SYSTEMOFRECORD_FISERVE, AccountData.SYSTEMOFRECORD_ISERIES, AccountData.SYSTEMOFRECORD_LEASEMASTER); accountData.PhoneNumber = _faker.Person.Phone; await cosmosContainer.CreateItemAsync( accountData, new PartitionKey(accountData.AccountNumber)); var accountDataStoreOptions = new AccountDataStoreOptions( _configuration["AzureCosmosDocumentStoreOptions:DatabaseId"], _cosmosClient); var accountDataStore = new AccountDataStore( accountDataStoreOptions); // Act await accountDataStore.DeleteByIdAsync( accountData.Id, accountData.AccountNumber); // Assert Func <Task> action = async() => await cosmosContainer.ReadItemAsync <AccountData>( accountData.Id.ToString(), new PartitionKey(accountData.AccountNumber)); action.Should().Throw <CosmosException>() .WithMessage("*Resource Not Found*");; }