测试采用 IQueryable 参数的 public class 方法

Question

我是 C# 新手，刚接触测试。我在这里和其他在线页面上阅读了几个关于使用 Moq 进行单元测试的问题，但我就是不明白。

以下是我希望使用硬编码读数列表测试的表达式。

public class RequiredStations
{
    //private readonly WundergroundEntities _database;

    public List<Reading> Stations(IQueryable<Reading> readingsList)
    {
        return readingsList.GroupBy(r => r.WeatherStationID)
                         .Select(grp => new Reading { WeatherStationID = grp.Key, Date_Taken = grp.Max(dt => dt.Date_Taken) })
                         .ToList();

    }
}

以下是我最近对上述内容进行的拙劣尝试...

[TestClass]
public class RequiredStations_Tests
{
    [TestMethod]
    public void TestingWeatherStationsRequiredLinq()
    {
        IList<Reading> readings = new List<Reading>
            {
            new Reading { WeatherStationID = "1", ReadingID = 1, Reading_Date = new DateTime(01/01/2014), Date_Taken = new DateTime(01/01/2014), Avg_Temperature = 6, Max_Temperature = 8, Min_Temperature = 2},
            new Reading { WeatherStationID = "1", ReadingID = 2, Reading_Date = new DateTime(02/01/2014), Date_Taken = new DateTime(02/01/2014), Avg_Temperature = 1, Max_Temperature = 1, Min_Temperature = 1},
            new Reading { WeatherStationID = "1", ReadingID = 3, Reading_Date = new DateTime(03/01/2014), Date_Taken = new DateTime(03/01/2014), Avg_Temperature = 3, Max_Temperature = 3, Min_Temperature = 3},
            new Reading { WeatherStationID = "2", ReadingID = 4, Reading_Date = new DateTime(01/02/2014), Date_Taken = new DateTime(01/02/2014), Avg_Temperature = 8, Max_Temperature = 8, Min_Temperature = 8},
            new Reading { WeatherStationID = "2", ReadingID = 5, Reading_Date = new DateTime(01/03/2014), Date_Taken = new DateTime(01/03/2014), Avg_Temperature = 9, Max_Temperature = 9, Min_Temperature = 9},
            new Reading { WeatherStationID = "2", ReadingID = 6, Reading_Date = new DateTime(01/04/2014), Date_Taken = new DateTime(01/04/2014), Avg_Temperature = 11, Max_Temperature = 11, Min_Temperature = 11}

        };

        Mock<RequiredStations> requiredStations = new Mock<RequiredStations>();

有人可以解释一下我应该如何创建读数列表，然后模拟 class & 方法。或者如果这是完全错误的方法，请赐教？

Answer 1

您已经创建了您的 List<Readings>，我想您可以将它传递给您的方法以在其上调用 AsQueryable() 扩展方法进行测试。

像这样：

[TestMethod]
public void TestingWeatherStationsRequiredLinq()
{
    List<Reading> readings = new List<Reading>
        {
        new Reading { WeatherStationID = "1", ReadingID = 1, Reading_Date = new DateTime(01/01/2014), Date_Taken = new DateTime(01/01/2014), Avg_Temperature = 6, Max_Temperature = 8, Min_Temperature = 2},
        new Reading { WeatherStationID = "1", ReadingID = 2, Reading_Date = new DateTime(02/01/2014), Date_Taken = new DateTime(02/01/2014), Avg_Temperature = 1, Max_Temperature = 1, Min_Temperature = 1},
        new Reading { WeatherStationID = "1", ReadingID = 3, Reading_Date = new DateTime(03/01/2014), Date_Taken = new DateTime(03/01/2014), Avg_Temperature = 3, Max_Temperature = 3, Min_Temperature = 3},
        new Reading { WeatherStationID = "2", ReadingID = 4, Reading_Date = new DateTime(01/02/2014), Date_Taken = new DateTime(01/02/2014), Avg_Temperature = 8, Max_Temperature = 8, Min_Temperature = 8},
        new Reading { WeatherStationID = "2", ReadingID = 5, Reading_Date = new DateTime(01/03/2014), Date_Taken = new DateTime(01/03/2014), Avg_Temperature = 9, Max_Temperature = 9, Min_Temperature = 9},
        new Reading { WeatherStationID = "2", ReadingID = 6, Reading_Date = new DateTime(01/04/2014), Date_Taken = new DateTime(01/04/2014), Avg_Temperature = 11, Max_Temperature = 11, Min_Temperature = 11}
    };

    RequiredStations requiredStations = new RequiredStations();
    var result = requiredStations.Stations(readings.AsQueryable());
    //assert things about result here
}

如果您没有看到 AsQueryable() 方法，那么您可能需要将其添加到您的 using 语句中：

using System.Linq;

Answer 2

这里没有什么可以嘲笑的。被测试的代码没有依赖关系。它只接受一个集合和 returns 一个修改后的集合：

// arrange
IList<Reading> readings = new List<Reading>
{
    // build your hard-coded data
};
RequiredStations requiredStations = new RequiredStations();

// act
var result = requiredStations.Stations(readings);

// assert
// examine "result" to make sure it is what you expect

测试采用 IQueryable 参数的 public class 方法

Testing a public class Method that takes an IQueryable parameter

c#

unit-testing

moq