模拟的 UserManager 和 roleManager 方法返回 null

Question

我已经模拟了 userManager 并使用返回值设置了所需的函数。

但是，每当我尝试运行单元测试时，即使我设置的返回值不同，我也会不断收到错误/失败的返回值。

    [TestCase]
    public async Task Verify_UserInRole_False()
    {
        var userRole = "Supervisor";
        var email = "test@test.com";

        var mockUserStore = new Mock<IUserStore<IdentityUser>>();
        var mockUserRoleStore = mockUserStore.As<IUserRoleStore<IdentityUser>>();
        var mockedUserManager = new Mock<UserManager<IdentityUser>>(new Mock<IUserStore<IdentityUser>>(mockUserRoleStore).Object,
                new Mock<IOptions<IdentityOptions>>().Object,
                new Mock<IPasswordHasher<IdentityUser>>().Object,
                new IUserValidator<IdentityUser>[0],
                new IPasswordValidator<IdentityUser>[0],
                new Mock<ILookupNormalizer>().Object,
                new Mock<IdentityErrorDescriber>().Object,
                new Mock<IServiceProvider>().Object,
                new Mock<ILogger<UserManager<IdentityUser>>>().Object);


        mockedUserManager.Setup(x => x.FindByEmailAsync(email))
        .ReturnsAsync(It.Is<IdentityUser>(u => u.UserName == email));

        mockUserRoleStore.Setup(x => x.IsInRoleAsync(It.Is<IdentityUser>(u => u.UserName == email), userRole, It.IsAny<CancellationToken>()))
        .ReturnsAsync(true);

        AdminController adminController = new AdminController(hostingEnvironment, signInManager, logger, roleManager, mockedUserManager.Object);
        var actionResult = await adminController.CheckIfUserIsInRole(email, userRole);
        Assert.IsTrue(actionResult);
    }

待测方法：

public async Task<bool> CheckIfUserIsInRole(string email, string role)
{
    return await _userManager.IsInRoleAsync(await _userManager.FindByEmailAsync(email), role);
}

userManager 的各种方法也是如此，例如 AddToRole();等等

据我了解： 当我在嘲笑 IsInRoleAsync() 时， 一旦 CheckIfUserIsInRole(...) 方法被命中， IsInRoleAsync() 应该被模拟对象替换，并且应该返回我们配置模拟对象返回的任何内容。

我做错了什么？

谢谢:)

Answer 1

问题在于您的模拟设置。如果您使用特定对象或值moq 将使用IEquatable.Equals 比较实例。您有以下设置：

mockedUserManager.Setup(x => x.FindByEmailAsync(email))
    .ReturnsAsync(new IdentityUser { UserName = email });

mockUserRoleStore.Setup(x => x.IsInRoleAsync(new IdentityUser() { UserName = email }, userRole, ct))
    .ReturnsAsync(true);

由于您每次都创建新实例，因此您的设置永远不会真正匹配。考虑将第二个设置更改为：

mockUserRoleStore.Setup(x => x.IsInRoleAsync(It.IsAny<IdentityUser>(), userRole, It.IsAny<CancellationToken>()))
    .ReturnsAsync(true);

或者更具体的

mockUserRoleStore.Setup(x => x.IsInRoleAsync(It.Is<IdentityUser>(u => u.UserName == email), userRole, It.IsAny<CancellationToken>()))
    .ReturnsAsync(true);

更新

我注意到另一个问题，因为您没有使用模拟的 mockUserRoleStore 而是使用新的模拟实例初始化 mockedUserManager：

var mockUserRoleStore = mockUserStore.As<IUserRoleStore<IdentityUser>>();
var mockedUserManager = new Mock<UserManager<IdentityUser>>(mockUserRoleStore.Object,
    new Mock<IOptions<IdentityOptions>>().Object,
    new Mock<IPasswordHasher<IdentityUser>>().Object,
    new IUserValidator<IdentityUser>[0],
    new IPasswordValidator<IdentityUser>[0],
    new Mock<ILookupNormalizer>().Object,
    new Mock<IdentityErrorDescriber>().Object,
    new Mock<IServiceProvider>().Object,
    new Mock<ILogger<UserManager<IdentityUser>>>().Object);