FeedReader: 非同期実行中の例外をシミュレートする仕掛け

FeedReader.cs

public class FeedReader
{
#if DEBUG
    public string test__RaiseErrorUrl;
    public Exception test__RaiseException;
#endif

    // (略)

    private async Task<FeedData> ReadAsync(Uri feedUri)
    {
        SyndicationClient client = new SyndicationClient() { BypassCacheOnRetrieve = true };
        SyndicationFeed feed = await client.RetrieveFeedAsync(feedUri);

#if DEBUG
        if (feedUri.OriginalString == this.test__RaiseErrorUrl)
            throw this.test__RaiseException;
#endif

        return feed.ToFeedData();
    }
}