检查是否引发了事件答案

【问题标题】：Check if event was raised检查是否引发了事件
【发布时间】：2014-12-10 09:37:06
【问题描述】：

我正在编写一个应用程序，在按下窗口中的按钮后，LoginWindow Loger 会通过数据库进行检查，如果传递的凭据正常。如果它返回一些东西（非空），我想检查 logger.validateuser() 是否引发了 LoginSucces 事件。如何测试？

namespace Komora.Classes.Loger
{
public abstract class Loger
{

    public delegate void LoginStatus(object sender, EventArgs e);
    public event LoginStatus loginSucces;
    public event LoginStatus loginFailed;

    public abstract void validateUser(string login, string password) ;

    protected void RaiseLoginSuccesEvent(EventArgs eventArgs)
    {
        if (loginSucces != null)
        {
            loginSucces(this, eventArgs);
        }
    }

    protected void RaiseLoginFailedEvent(EventArgs eventArgs)
    {
        if (loginFailed != null)
        {
            loginFailed(this, eventArgs);
        }
    }
}
}

namespace Komora.Classes.Loger
{
public class LogerDataBase : Loger
{
    #region Private Variables
    DataBase.IDataBaseConncection dataBaseConnection;
    #endregion

    #region Constructor
    public LogerDataBase(DataBase.IDataBaseConncection dataBaseConnection)
    {
        this.dataBaseConnection = dataBaseConnection;
    }
    #endregion

    #region Derived Methods
    public override void validateUser(string login, string password)
    {
        if (LogInSuccess(login, password))
        {
            RaiseLoginSuccesEvent(EventArgs.Empty);
        }
        else
        {
            RaiseLoginFailedEvent(EventArgs.Empty);
        }
    }
    #endregion

    #region Private Methods
    private bool LogInSuccess(string login, string password)
    {
        if (null != dataBaseConnection.getUserByCredentials(login, password))
            return true;
        else
            return false;
    }
    #endregion

}
}

public class LogerDataBaseTests
{
    [TestCase]
    public void ValidateUserCalledWithGoodUserCredentialsRaisesLoginSuccesEventShouldPass()
    {
        var dataBaseConnectionMock = new Mock<Classes.DataBase.IDataBaseConncection>();
        dataBaseConnectionMock.Setup(m => m.getUserByCredentials(It.IsAny<string>(), It.IsAny<string>())).Returns(new object());

        var loger = new Classes.Loger.LogerDataBase(dataBaseConnectionMock.Object);
        loger.validateUser("user", "pass");

    }
}

【问题讨论】：

标签： c# unit-testing events nunit moq

【解决方案1】：

只需将您的测试订阅到该事件并检查它是否已引发：

public class LogerDataBaseTests
{
    [TestCase]
    public void ValidateUserCalledWithGoodUserCredentialsRaisesLoginSuccesEventShouldPass()
    {
        var dataBaseConnectionMock = new Mock<Classes.DataBase.IDataBaseConncection>();
        dataBaseConnectionMock.Setup(m => m.getUserByCredentials(It.IsAny<string>(), It.IsAny<string>())).Returns(new object());

        var loger = new Classes.Loger.LogerDataBase(dataBaseConnectionMock.Object);

        bool successRaised = false;
        bool failureRaised = false;
        loginSucces += (s, e) => {successRaised = true;}
        loginFailed += (s, e) => {failureRaised = true;}

        loger.validateUser("user", "pass");

        Assert.IsTrue(successRaised);
        Assert.IsFalse(failureRaised);            
    }
}

【讨论】：

【解决方案2】：

进行两项测试，一项代表“成功”，一项代表“失败”。

[TestClass]
public class LogerDataTest
{
    [TestMethod]
    public void validateUser_getUserByCredentialsReturnsNotNull_loginSuccesEventIsRaised()
    {
        // Arrange
        const int loginSuccesExpected = 1;
        int loginSuccesActual = 0;
        Mock<DataBase.IDataBaseConncection> dataConnectionStub = new Mock<DataBase.IDataBaseConncection>();
        dataConnectionStub.Setup(db => db.getUserByCredentials("loginFake", "passwordFake")).Returns("User");
        LogerDataBase logerData = new LogerDataBase(dataConnectionStub.Object);
        logerData.loginSucces += (sender, args) =>
        {
            loginSuccesActual++;
        };

        // Act
        logerData.validateUser("loginFake", "passwordFake");

        // Assert
        Assert.AreEqual(loginSuccesExpected, loginSuccesActual);
    }

    [TestMethod]
    public void validateUser_getUserByCredentialsReturnsNull_loginFailedEventIsRaised()
    {
        // Arrange
        const int loginFailedExpected = 1;
        int loginFailedActual = 0;
        Mock<DataBase.IDataBaseConncection> dataConnectionStub = new Mock<DataBase.IDataBaseConncection>();
        dataConnectionStub.Setup(db => db.getUserByCredentials("loginFake", "passwordFake")).Returns(null);
        LogerDataBase logerData = new LogerDataBase(dataConnectionStub.Object);
        logerData.loginFailed += (sender, args) =>
        {
            loginFailedActual++;
        };

        // Act
        logerData.validateUser("loginFake", "passwordFake");

        // Assert
        Assert.AreEqual(loginFailedExpected, loginFailedActual);
    }   
}

【讨论】：