如何在.Net Core测试中模拟UserManager? [英] How to mock UserManager in .Net Core testing?
问题描述
我有以下代码.我正在尝试为创建用户运行测试用例.以下是我到目前为止尝试过的内容.
I have following code. Im trying to running a test case for create user.Following is what i have tried so far.
public class CreateUserCommandHandlerTest
{
private Mock<UserManager<ApplicationUser>> _userManager;
private CreateUserCommandHandler _systemUnderTest;
public CreateUserCommandHandlerTest()
{
_userManager = MockUserManager.GetUserManager<ApplicationUser>();
var user = new ApplicationUser() { UserName = "ancon1", Email = "ancon@mail.com", RoleType = RoleTypes.Anonymous };
_userManager
.Setup(u => u.CreateAsync(user, "ancon2")).ReturnsAsync(IdentityResult.Success);
_systemUnderTest = new CreateUserCommandHandler(_userManager.Object);
}
[Fact]
public async void Handle_GivenValidInput_ReturnsCreatedResponse()
{
var command = new CreateUserCommand { Username = "ancon1", Email = "ancon@mail.com", Password = "ancon2", RoleType = RoleTypes.Anonymous };
var result = await _systemUnderTest.Handle(command, default(CancellationToken));
Assert.NotNull(result);
Assert.IsType<Application.Commands.CreatedResponse>(result);
}
}
我的用户经理在这里:
public static class MockUserManager
{
public static Mock<UserManager<TUser>> GetUserManager<TUser>()
where TUser : class
{
var store = new Mock<IUserStore<TUser>>();
var passwordHasher = new Mock<IPasswordHasher<TUser>>();
IList<IUserValidator<TUser>> userValidators = new List<IUserValidator<TUser>>
{
new UserValidator<TUser>()
};
IList<IPasswordValidator<TUser>> passwordValidators = new List<IPasswordValidator<TUser>>
{
new PasswordValidator<TUser>()
};
userValidators.Add(new UserValidator<TUser>());
passwordValidators.Add(new PasswordValidator<TUser>());
var userManager = new Mock<UserManager<TUser>>(store.Object, null, passwordHasher.Object, userValidators, passwordValidators, null, null, null, null);
return userManager;
}
}
我的命令处理程序是这样的:
and my Command handler is this:
public class CreateUserCommandHandler : IRequestHandler<CreateUserCommand, BaseCommandResponse>
{
private readonly UserManager<ApplicationUser> _userManager;
public CreateUserCommandHandler(UserManager<ApplicationUser> userManager)
{
_userManager = userManager;
}
public async Task<BaseCommandResponse> Handle(CreateUserCommand createUserCommand, CancellationToken cancellationToken)
{
var user = new ApplicationUser { UserName = createUserCommand.Username, Email = createUserCommand.Email, RoleType = createUserCommand.RoleType };
var result = await _userManager.CreateAsync(user, createUserCommand.Password);
if (result.Succeeded)
{
return new CreatedResponse();
}
ErrorResponse errorResponse = new ErrorResponse(result.Errors.Select(e => e.Description).First());
return errorResponse;
}
}
当我运行测试时，它失败并说对象引用未设置为对象的瞬间".
when i'm running my test it fails and saying Object reference not set to an instant of an object.
我在这里做错什么了吗?
What am i doing wrong here??
推荐答案
我知道这已经有几个月了，但我还是回到了这个话题上.我将就这个主题扩展自己的答案，因为仅指向Haok的GitHub示例就好像说:读一本书"，因为它很大.它没有查明问题和您需要执行的操作.您需要隔离一个Mock对象，但不仅如此，还需要设置""CreateAsync"的方法.因此，我们将其分为三个部分:
I know this is months old but I keep getting back to this thread. I will extend my own answer on this topic because just pointing to Haok's GitHub example is like saying: "Read a book" as it is huge. It does not pinpoint the issue and what you need to do. You need to isolate a Mock object, but not only that but also you need to 'Setup' the method for 'CreateAsync'. So let's put this in three parts:
- 如果您使用MOQ或类似的框架来模拟UserManager的创建，则需要MOCK.
- 您需要设置希望从中获取结果的UserManager的方法.
- (可选)您希望从模拟的Entity Framework Core 2.1或类似物中注入一些通用列表，以便实际上可以看到IDentity用户列表实际上是在增加还是在减少.不仅UserManager成功了，而且没有其他
所以说我有一个用于返回模拟的UserManager的辅助方法.与Haok代码稍有不同:
So say I have a helper method for returning a Mocked UserManager. Which is just slightly altered from the Haok code:
public static Mock<UserManager<TUser>> MockUserManager<TUser>(List<TUser> ls) where TUser : class
{
var store = new Mock<IUserStore<TUser>>();
var mgr = new Mock<UserManager<TUser>>(store.Object, null, null, null, null, null, null, null, null);
mgr.Object.UserValidators.Add(new UserValidator<TUser>());
mgr.Object.PasswordValidators.Add(new PasswordValidator<TUser>());
mgr.Setup(x => x.DeleteAsync(It.IsAny<TUser>())).ReturnsAsync(IdentityResult.Success);
mgr.Setup(x => x.CreateAsync(It.IsAny<TUser>(), It.IsAny<string>())).ReturnsAsync(IdentityResult.Success).Callback<TUser, string>((x, y) => ls.Add(x));
mgr.Setup(x => x.UpdateAsync(It.IsAny<TUser>())).ReturnsAsync(IdentityResult.Success);
return mgr;
}
关键是要注入通用的"TUser"，这也是我将要测试的列表.类似于我的示例:
What is key to this is I am injecting a generic 'TUser' that is what I will be testing as well injecting a list of this. Similar to my example of:
private List<ApplicationUser> _users = new List<ApplicationUser>
{
new ApplicationUser("User1", "user1@bv.com") { Id = 1 },
new ApplicationUser("User2", "user2@bv.com") { Id = 2 }
};
...
var userManager = IdentityMocking.MockUserManager<ApplicationUser>(_users);
然后，最后我要使用与我要测试的实现类似的存储库来测试模式:
Then finally I am testing a pattern with a repository similar to this implementation I want to test:
public async Task<int> CreateUser(ApplicationUser user, string password) => (await _userManager.CreateAsync(user, password)).Succeeded ? user.Id : -1;
我这样测试:
[Fact]
public async Task CreateAUser()
{
var newUser = new ApplicationUser("NewUser", "New@test.com");
var password = "P@ssw0rd!";
var result = await _repo.CreateUser(newUser, password);
Assert.Equal(3, _users.Count);
}
我这样做的关键是不仅我设置"了CreateAsync，而且还提供了一个回调，这样我才能真正看到我注入的列表得到增加.希望这对某人有帮助.
The key to what I did is that not only did I 'Setup' the CreateAsync but I provided a callback so I can actually see my list I inject get incremented. Hope this helps someone.
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