c# - 如何从自定义比较中获取有关失败的更详细信息？

Question

我为以下要在测试中使用的对象构建了自己的比较。它按照当前的方式工作，并在比较字段之一不匹配时传递错误值。有没有一种方法可以为我提供有关比较失败的字段的更详细信息？

[DataContract]
public class Stats : IEquatable<Stats>
{
    [DataMember]
    public string StatusCode { get; set; }
    [DataMember]
    public int ProspectCount { get; set; }
    [DataMember]
    public int MessageCount { get; set; }
    [DataMember]
    public int NewListingCount { get; set; }
    [DataMember]
    public int ReminderCount { get; set; }
    [DataMember]
    public int MyListingCount { get; set; }
    [DataMember]
    public int OfficeListingCount { get; set; }

    public bool Equals(Stats other)
    {
        if (Object.ReferenceEquals(other, null)) return false;

        if (Object.ReferenceEquals(this, other)) return true;

        return StatusCode.Equals(other.StatusCode) &&
               ProspectCount.Equals(other.ProspectCount) &&
               MessageCount.Equals(other.MessageCount) &&
               NewListingCount.Equals(other.NewListingCount) &&
               ReminderCount.Equals(other.ReminderCount) &&
               MyListingCount.Equals(other.MyListingCount) &&
               OfficeListingCount.Equals(other.OfficeListingCount);
    }

}

测试:

[Theory]
[ExcelData("Stats.xls", "Select * from TestData")]
public void GoodDataTests(int SubscriptionId, int ProfileId, int ClientID, string statusCode, int prospectCount,
    int messageCount, int newListingCount, int reminderCount, int myListingCount, int officListingCount)
{
    DataContainers.Stats expectedStats = new DataContainers.Stats{
        StatusCode = statusCode,
        ProspectCount = prospectCount,
        MessageCount = messageCount,
        NewListingCount = newListingCount,
        ReminderCount = reminderCount,
        MyListingCount = myListingCount,
        OfficeListingCount = officListingCount
    };    

    string url = Utils.CreateStatisticsUrlRequest(SubscriptionId,ProfileId,ClientID);
    string response = Utils.GetResponseBody(url);

    DataContainers.Stats results = JsonConvert.DeserializeObject<DataContainers.Stats>(response);

    Assert.Equal(expectedStats, results);
}

我当前的 xunit 失败输出如下所示:

Test Name: GoodDataTests Test FullName: ThunderBallApiTests.StatisticsTests.GoodDataTests Test Source: \sky.dom\mlfile1\users\DanS\My Documents\Visual Studio 2012\Projects\ThunderBallApiTests\ThunderBallApiTests\StatisticsTests.cs : line 20 Test Outcome: Failed Test Duration: 0:00:20.203

Result1 Name: GoodDataTests(SubscriptionId: 167769, ProfileId: 1571394, ClientID: 1234, statusCode: "Active", prospectCount: 54, messageCount: 17, newListingCount: 0, reminderCount: 33, myListingCount: 0, officListingCount: 2) Result1 Outcome: Failed Result1 Duration: 0:00:01.471 Result1 Message:
Assert.Equal() Failure Expected: ThunderBallApiTests.DataContainers.Stats Actual: ThunderBallApiTests.DataContainers.Stats Result1 StackTrace: at ThunderBallApiTests.StatisticsTests.StatisticsGoodDataTests(Int32 SubscriptionId, Int32 ProfileId, Int32 Id, String statusCode, Int32 prospectCount, Int32 messageCount, Int32 newListingCount, Int32 reminderCount, Int32 myListingCount, Int32 officListingCount) in \sky.dom\mlfile1\users\DanS\My Documents\Visual Studio 2012\Projects\ThunderBallApiTests\ThunderBallApiTests\StatisticsTests.cs:line 36

Answer 1

请注意，对数据合约进行相等操作通常不是一个好闻的事情。 xUnit Test Patterns Book在这个领域提供了很好的一般建议和模式。这本书涵盖了特定于测试的平等和平等污染的概念。它还具有 Custom Assertion 的概念。 ，它可以满足您的需求(假设生产代码中不直接需要等式)。

其他有用的技巧是:

• 覆盖 ToString 和 Assert.Equal 将免费提供更好的诊断(您可以使用 CR 或 R# tem[plate 来执行此操作)
• 映射到Tuple或匿名类并免费获得所述ToString impl。

就自动化此类操作的工具而言，您可以使用 AutoFixture's Likeness (对于这种情况来说，这有点过分了，但对于 map 绘制者来说可能非常好，并且是值得注意的潜在金锤；)。另外，如果您使用 F# ( you really should ) 编写测试，则可以 lean on unquote .