在.Net Core中测试控制器总是返回false？

Question

我编写了以下XUnit测试来测试.Net Core WebApi控制器的操作:

namespace VistaBest.XUnitTest.Api.Test
{
    public class Account_UnitTest
    {
        [Fact]
        public void ValidateUserTest()
        {
            const string username = "admin";
            const string password = "admin";
            var usersBusinessObjectMock = new Mock<IUsersBusinessObject>();
            usersBusinessObjectMock.Setup(service => service.ValidateUser(username, password)).Returns(() => true);
            var controller = new AccountController(usersBusinessObjectMock.Object);
            var actionResult = controller.ValidateUser(new LoginModel
            {
                Username = username,
                Password = password
            });
            var okObjectResult = Assert.IsType<OkObjectResult>(actionResult);
            var result = okObjectResult.Value as bool?;
            Assert.True(result);
        }
    }
}

AccountController:

namespace VistaBest.Api.Controllers
{
    public class AccountController : BaseController
    {
        private readonly IUsersBusinessObject _usersBusinessObject;
        public AccountController(IUsersBusinessObject usersBusinessObject)
        {
            _usersBusinessObject = usersBusinessObject;
        }

        [HttpPost]
        public IActionResult ValidateUser(LoginModel model)
        {
            if(!ModelState.IsValid) return BadRequest(ModelState);
            return Ok(_usersBusinessObject.ValidateUser(model.Username, model.Password.ToMd5Hash()));
        }
    }
}

IUsersBusinessObject:

namespace VistaBest.Data.BusinessObjects
{
    public interface IUsersBusinessObject
    {
        bool ValidateUser(string username, string password);
        UserModel SelectByUsername(string username);
    }

    public class UsersBusinessObject : BaseBusinessObject, IUsersBusinessObject
    {
        public UsersBusinessObject(IDbConnection connection) : base(connection)
        {

        }

        private const string TableName = "Users";

        public bool ValidateUser(string username, string password)
        {
            var query = $"SELECT COUNT(*) FROM [{TableName}] WHERE UserName = @username and Password = @password";
            return DbConnection.QueryFirst<int>(query, new { username, password }) == 1;
        }
}

如你所见,我说usersBusinessObjectMock必须回复true:

usersBusinessObjectMock
    .Setup(service => service.ValidateUser(username, password))
    .Returns(() => true);

但var result = okObjectResult.Value as bool?;总是如此false

怎么了？

Answer 1

读完你的代码就像10分钟一样,因为这个错误很难找到.你把一切都做对了......

        var okObjectResult = Assert.IsType<OkObjectResult>(actionResult);
        var result = okObjectResult.Value as bool?;
        Assert.True(result);

但这是错误......

var是危险的...你的变量okObjectResult不是来自类型OkObjectResult ...这就是为什么你的断言永远不是真的......我相信你的意思是不要输入

Assert.IsType<OkObjectResult>(actionResult);
var okObjectResult = (OkObjectResult) actionResult;