MStestのタスク結果はnullです

Question

私のテストでは少し苦労しています。ここで

は私が

public async Task Handle(ReceiveEventsFromSalesForceCommand message, IMessageHandlerContext context) 
{ 
    var queryResult = await this.GenerateQueryResultAsync(message).ConfigureAwait(false); 

    await this.DetermineActionAsync(context, queryResult).ConfigureAwait(false); 
} 

public async Task<QueryResult<EventStore__c>> GenerateQueryResultAsync(ReceiveEventsFromSalesForceCommand message) 
{ 
    QueryResult<EventStore__c> queryResult; 
    if (string.IsNullOrWhiteSpace(message.NextRecordsUrl)) 
     { 
      queryResult = await this.forceClient.QueryAsync<EventStore__c>(query).ConfigureAwait(false); 
      this.log.Info($"AFTER: QueryAllAsync<EventStore>(query), found {queryResult?.TotalSize ?? 0} records"); 
     } 
     else 
     { 
      queryResult = await this.forceClient.QueryContinuationAsync<EventStore__c>(message.NextRecordsUrl).ConfigureAwait(false); 
      this.log.Info("AFTER: QueryContinuationAsync<EventStore>(query)"); 
     } 
    return queryResult; 
} 

をテストしていたコードであり、これは

[TestMethod] 
    public async Task Test() 
    { 
     // arrange 
     var forceConfig = Substitute.For<ISalesForceCreationHandlerConfig>(); 
     var forceClient = Substitute.For<IForceClient>(); 
     forceClient.QueryAllAsync<EventStore__c>(Arg.Any<string>()).Returns(Task.FromResult(new QueryResult<EventStore__c> { NextRecordsUrl = "Dummy" })); 
     var messageHandlerContext = Substitute.For<IMessageHandlerContext>(); 
     var handler = new SalesForceBatchCreationHandler(forceClient, null, forceConfig); 

     // act 
     await handler.Handle(new ReceiveEventsFromSalesForceCommand(), messageHandlerContext); 

     // assert 
     await messageHandlerContext.Received().Send(Arg.Is<ReceiveEventsFromSalesForceCommand>(command => string.IsNullOrWhiteSpace(command.NextRecordsUrl)), Arg.Any<SendOptions>()); 
     await messageHandlerContext.DidNotReceive().SendLocal(Arg.Any<PublishMultipleKlantManagementEnvelopeCreatedEventsCommand>()); 
    } 

私の問題は私のGenerateQueryResultAsync方法のiresultがnullであると私はとNullReferenceExceptionを得ることである私のユニットテストです。結果がnullでないことを確認して例外を回避するにはどうすればよいですか？

Answer 1

非同期呼び出しの方法を再構成します。おそらくこの{queryResult.TotalSize}が原因です。

public async Task<QueryResult<EventStore__c>> GenerateQueryResultAsync(ReceiveEventsFromSalesForceCommand message) { 
    QueryResult<EventStore__c> queryResult; 
    if (string.IsNullOrWhiteSpace(message.NextRecordsUrl)) { 
     queryResult = await this.forceClient.QueryAsync<EventStore__c>(query).ConfigureAwait(false); 
     this.log.Info($"AFTER: QueryAllAsync<EventStore>(query), found {queryResult?.TotalSize ?? 0} records"); 
    } else { 
     queryResult = await this.forceClient.QueryContinuationAsync<EventStore__c>(message.NextRecordsUrl).ConfigureAwait(false); 
     this.log.Info("AFTER: QueryContinuationAsync<EventStore>(query)"); 
    } 
    return queryResult; 
}