unit-testing - 使用 Autofac 根据条件解析多个 Moq 对象

Question

您好，我在创建单元测试时将 Moq 与 Autofac 结合使用。我有一个场景，其中我的 SUT 类型的多个实例取决于构造函数参数。我想对这些实例进行最小起订量。我有一个接口(interface)ISpanRecord:

interface ISpanRecord 
{
RecordType RecordType { get; }
string RecordId { get; set; }
string RecordText { get; set; }
ISpanRecord ParentRecord { get; set; }
List<ISpanRecord> Children { get; }
}

我有另一个接口(interface)IRecordTypeFactory，它在RecordType(它是一个枚举)的基础上提供了一个新的ISpanRecord

interface IRecordTypeFactory
{
ISpanRecord GetNewSpanRecord(RecordType recordType);
}

以上接口(interface)由SUT SpanParser类使用

internal class SpanParser : ISpanParser
{
// Private Vars
    private ISpanRecord _spanFile;
    private readonly IRecordTypeFactory _factory;
    private readonly ISpanFileReader _fileReader;

//Constructor
public SpanParser(ISpanFileReader fileReader)
    {
        _fileReader = fileReader;
        _spanFile = Container.Resolve<ISpanRecord>(TypedParameter.From(RecordType.CmeSpanFile),
                                                                TypedParameter.From((List<SpanRecordAttribute>)null));
        _factory = Container.Resolve<IRecordTypeFactory>(TypedParameter.From(_fileReader.PublisherConfiguration));
    }

// Method under test
public SpanRiskDataSetEntity ParseFile()
    {
        string currRecord = string.Empty;
        try
        {
            var treeLookUp = Container.Resolve<ITreeLookUp>(TypedParameter.From(_spanFile),
                                                            TypedParameter.From(_fileReader.PublisherConfiguration));

            IList<string> filterLines = _fileReader.SpanFileLines;

            ISpanRecord currentRecord;
            ISpanRecord previousRecord = _spanFile;
            List<string> spanRecords;

            foreach (var newRecord in filterLines)
            {
                currRecord = newRecord;

                //check if we got multiple type of records in a single line.

                spanRecords = _fileReader.PublisherConfiguration.GetMultipleRecordsText(newRecord);
                if (spanRecords == null)
                    continue;

                foreach (var recordText in spanRecords)
                {
                    RecordType recordType = _fileReader.PublisherConfiguration.GetRecordType(recordText);

                    currentRecord = _factory.GetNewSpanRecord(recordType);

                    // some more logic

                    GetPreviousRecord(ref previousRecord, currentRecord);
                }
            }
            // private method
            return GetSpanRiskDataSet();
        }

        catch (OperationCanceledException operationCanceledException)
        {
            // log
            throw;
        } 
    }

在上面的类中，在测试的时候，我想在RecordType的基础上得到ISpanRecord的多个对象。像这样的东西:

mockFactory.Setup(fc=> fc.GetNewSpanRecord(It.IsAny<RecordType>).Returns(// an ISpanRecord object on the basis of Recordtype)

由于上面的设置会在循环中验证，所以我想设置多个案例。请让我知道解决方案是什么，或者指出可以解决的问题。

问候

Answer 1

Returns有多个重载，您正在寻找那些需要 Func<RecordType, ISpanRecord> 的重载作为论据。排序后，您可以构建自定义返回逻辑:

mockFactory
    .Setup(fc => fc.GetNewSpanRecord(It.IsAny<RecordType>)
    .Returns((RecordType rt) =>
    {
         if (rt.Property == "value") return new DummySpanRecord();
         else if (rt.Property2 == "other value") return new FakeSpanRecord();
         else return new DefaultSpanRecord();
    }); 

您使用 service locator instead of abstract factory 有什么原因吗？ ？如果您的容器没有嵌入到您的 SUT 中，也许测试会更容易(例如，您不必跟踪容器本身和依赖项注册过程)。