首先创建一个名为mockHttpSession的类，并从ISession继承.

First create class Named mockHttpSession and inherit from ISession.

public class MockHttpSession : ISession
{
    Dictionary<string, object> sessionStorage = new Dictionary<string, object>();

    public object this[string name]
    {
        get { return sessionStorage[name]; }
        set { sessionStorage[name] = value; }
    }

    string ISession.Id
    {
        get
        {
            throw new NotImplementedException();
        }
    }

    bool ISession.IsAvailable
    {
        get
        {
            throw new NotImplementedException();
        }
    }

    IEnumerable<string> ISession.Keys
    {
        get { return sessionStorage.Keys; }
    }

    void ISession.Clear()
    {
        sessionStorage.Clear();
    }

    Task ISession.CommitAsync()
    {
        throw new NotImplementedException();
    }

    Task ISession.LoadAsync()
    {
        throw new NotImplementedException();
    }

    void ISession.Remove(string key)
    {
        sessionStorage.Remove(key);
    }

    void ISession.Set(string key, byte[] value)
    {
        sessionStorage[key] = value;
    }

    bool ISession.TryGetValue(string key, out byte[] value)
    {
        if (sessionStorage[key] != null)
        {
            value = Encoding.ASCII.GetBytes(sessionStorage[key].ToString());
            return true;
        }
        else
        {
            value = null;
            return false;
        }
    }        
}

然后在实际控制器中使用此会话:

Then use this session in actual controller:

     Mock<HttpContext> mockHttpContext = new Mock<HttpContext>();
        MockHttpSession mockSession = new MockHttpSession();           
        mockSession["Key"] = Value;
        mockHttpContext.Setup(s => s.Session).Returns(mockSession);
        Controller controller=new Controller();
        controller.ControllerContext.HttpContext = mockHttpContext.Object;