c# - 单元测试 C# 创建第一个测试

Question

你好，我尝试添加单元测试，但看起来比我想象的要难 :( 有没有人可以帮助我并解释如何进行单元测试？

public class USerService : IUSerService
{
    [DataMember]
    public int ID { get; set; }
    [DataMember]
    public string Login { get; set; }
    [DataMember]
    public string UserType { get; set; }

    public List<UserInfo> GetUserU()
    {
        QuizDBEntities contex = new QuizDBEntities();
        var userU = from a in contex.UserInfoes select a;

        return userU.ToList();

    }

}

我确实使用“创建单元测试”进行创建，但这里对我来说变得很难，我迷路了，而且不像谷歌教程那样容易。

[TestClass()]
    public class USerServiceTest
    {


        private TestContext testContextInstance;

        /// <summary>
        ///Gets or sets the test context which provides
        ///information about and functionality for the current test run.
        ///</summary>
        public TestContext TestContext
        {
            get
            {
                return testContextInstance;
            }
            set
            {
                testContextInstance = value;
            }
        }

        #region Additional test attributes
        // 
        //You can use the following additional attributes as you write your tests:
        //
        //Use ClassInitialize to run code before running the first test in the class
        //[ClassInitialize()]
        //public static void MyClassInitialize(TestContext testContext)
        //{
        //}
        //
        //Use ClassCleanup to run code after all tests in a class have run
        //[ClassCleanup()]
        //public static void MyClassCleanup()
        //{
        //}
        //
        //Use TestInitialize to run code before running each test
        //[TestInitialize()]
        //public void MyTestInitialize()
        //{
        //}
        //
        //Use TestCleanup to run code after each test has run
        //[TestCleanup()]
        //public void MyTestCleanup()
        //{
        //}
        //
        #endregion


        /// <summary>
        ///A test for USerService Constructor
        ///</summary>
        // TODO: Ensure that the UrlToTest attribute specifies a URL to an ASP.NET page (for example,
        // http://.../Default.aspx). This is necessary for the unit test to be executed on the web server,
        // whether you are testing a page, web service, or a WCF service.
        [TestMethod()]
        [HostType("ASP.NET")]
        [AspNetDevelopmentServerHost("C:\\Users\\Drage\\Desktop\\lekcja1\\Dunskiseba", "/Dunskiseba")]
        [UrlToTest("http://localhost/Dunskiseba")]
        public void USerServiceConstructorTest()
        {
            USerService_Accessor target = new USerService_Accessor();
            Assert.Inconclusive("TODO: Implement code to verify target");
        }

Answer 1

嗯，我不太确定你的问题出在哪里，因为你没有提供太多信息，但我可以看出你复制了一些自动生成的代码，最重要的部分是

public void USerServiceConstructorTest()
{
    USerService_Accessor target = new USerService_Accessor();
    Assert.Inconclusive("TODO: Implement code to verify target");
}

上面的方法应该用来测试你的方法

public List<UserInfo> GetUserU()
{
    QuizDBEntities contex = new QuizDBEntities();
    var userU = from a in contex.UserInfoes select a;

    return userU.ToList();

}

您的特定方法没有太多要测试的，实际上应该对其进行更改以使其更易于测试，但这是一个不同的主题。

如果您想确保 GetUserU 只返回一个用户，您可以像这样测试它

public void USerServiceConstructorTest()
{
    USerService_Accessor target = new USerService_Accessor();
    List<UserInfo> expected = new List<UserInfo>();

    expected.Add(new UserInfo{ Name = "made up"});

    actual = target.GetUserU();

    Assert.Equals(expected, actual);

}

assert 语句用于指定您正在测试的内容。尽管我不认为以上内容会按原样工作，因为我断言两种列表类型相等。也许最好做这样的事情

public void USerServiceConstructorTest()
{
    USerService_Accessor target = new USerService_Accessor();
    List<UserInfo> expected = new List<UserInfo>();

    expected.Add(new UserInfo{ Name = "made up"});

    actual = target.GetUserU();

    Assert.Equals(expected.Count(), actual.Count());
    //here I'm going to assume they are sorted
    for(int i = 0; i < expected.Count(); i++)
    {
        Assert.Equals(expected[i], actual[i]);
    }

}

在大多数情况下，您将为测试不同场景的单个方法创建多个测试，如上面的测试，以确保您得到预期的结果。