单元测试耦合方法

Question

在下面的示例中，如果无法设置aggregationInfo对象，如何为Deaggregate（）方法编写单元测试？

public class Aggregator
{
    private AggregationInfo aggregationInfo;

    public List Aggregate(List objects)
    {
        //set aggregationInfo
    }
    public List Deaggregate(List aggregatedObjects)
    {
        //use aggregationInfo for the deagregation 
    }
}

Answer 1

我将通过调用Aggregate然后调用Deaggregate ，通过调用具有不同List的Aggregation并在这些情况下验证Deaggregate中的预期行为来提供不同的方案

Answer 2

如果要确保仅对方法进行单元测试，则可以执行以下操作：

public class Aggregator
{
    private AggregationInfo aggregationInfo;

    private readonly IAggregator aggregator;
    private readonly IDeaggragator deaggragotor;

    public Aggregator(IAggregator aggregator, IDeaggragator deaggragotor)
    {
        this.aggregator = aggregator;
        this.deaggragotor = deaggragotor;
    }

    public List Aggregate(List objects)
    {
        this.aggregationInfo = aggregator.Aggregate(objects);
        return someListIDontKnowWhereYouGetThisFrom;
    }

    public List Deaggregate(List aggregatedObjects)
    {
        return deaggregator.Deaggregate(objects, this.aggregationInfo);
    }
}

然后，您对Aggregator的单元测试可以像这样工作：

var systemUnderTest = new Aggregator(new MockAggregator(), new MockDeaggragator());

这将允许您验证Aggregator将为IAggregator和IDeaggragotor提供正确的参数。

最后，您还可以在单​​独的单元测试中测试RealDeaggragotor ，这可以满足您的问题。

Answer 3

不确定为什么您的汇总器需要知道该信息，这不应该是汇总返回值的属性吗？

public static class Aggregator
{
    public static AggregatedList Aggregate(List objects)
    {
        // aggregate objects to aggregatedlist and set the aggregationInfo
    }

    public static List Deaggregate(AggregatedList aggregatedList)
    {
        // use info from the aggregatedList
    }
}

public class AggregatedList
{
    public AggregationInfo AggregationInfo { get; set; }
    public List AggregatedObjects { get; set; }
}