[英]How to mock indexer information for the returned object in NSubstitute
我想模拟对象返回的索引器属性。 我正在使用NSubstitute进行嘲笑。 我有以下情况。 在示例中,我想在从IFeedData.GetFeedData返回时模拟索引器属性this [string symbolName]
public class FeedEntity
{
private SymbolData _symbolData;
public string Symbol { get; set; }
public SymbolData this[string symbolName]
{
get //Search Data into Actual Feed and returns relevent data for Symbol
{
if (_symbolData != null)
{
_symbolData = new SymbolData//Just Created For Sample Purpose
{
TraderName = "TestTrader",
BrokerName = "TestBroker"
};
}
return _symbolData;
}
set
{
_symbolData = value;
}
}
}
public class SymbolData
{
public string TraderName { get; set; }
public string BrokerName { get; set; }
}
public interface IFeedData
{
FeedEntity GetFeedData(string symbolName);
}
public class FeedClass : IFeedData
{
public FeedEntity GetFeedData(string symbolName)
{
return new FeedEntity
{
Symbol = "TestSymbol"
};
}
}
引用IFeedData的主类-
public class FeedProcesser
{
private IFeedData _feedService = new FeedClass();
public FeedProcesser(IFeedData feedService)
{
_feedService = feedService;
}
public void ProcessFeedData(string symbol)
{
var feedRespnse= _feedService.GetFeedData(symbol);
//do feed processing logic based on Trader and Broker Information
}
}
单元测试类别为-
[TestClass]
public class UnitTest1
{
[TestMethod]
public void TestMethod1()
{
var iFeedData = Substitute.For<FeedClass>();
iFeedData.GetFeedData(Arg.Any<string>()).Returns(x => new FeedEntity() { Symbol = "HHH" });
var processer = new FeedProcesser(iFeedData);
processer.ProcessFeedData("HHH");
}
}
任何帮助表示赞赏!
为了模拟FeedEntity
我们需要将其所有成员virtual
或提取一个接口。 然后,我们可以像这样模拟索引器:
var feedEntity = Substitute.For<IFeedEntity>();
feedEntity["ABC"] = new SymbolData(...);
// or if it is a get-only indexer:
feedEntity["ABC"].Returns(new SymbolData(...));
如果您只是想测试FeedProcessor
我们可能无需赘述。 相反,我们可以代替IFeedData
。
[Test]
public void TestProcessing() {
var feedData = Substitute.For<IFeedData>();
feedData.GetFeedData("HHH").Returns(new FeedEntity(...));
// Configure substitute to return a real FeedEntity.
// Alternatively, return a substitute IFeedEntity as described above
var subject = new FeedProcessor(feedData);
subject.ProcessFeedData();
// assert correct processing
}
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