Question

我在我的一项测试中苦苦挣扎。

这是我正在测试的代码

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;
}

这是我的单元测试

[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>());
    }

我的问题是我的GenerateQueryResultAsync方法的结果是null，我得到一个NullReferenceException。如何确保结果不为null并避免异常？

Answer 1

重新构建异步调用的方式。最有可能的是{queryResult.TotalSize}是罪魁祸首。

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;
}

MStest任务结果为空

1 个答案: