Question

我正在使用.Net Core构建一些Web API。在测试我的一种服务方法时，我遇到了一个问题，即在模拟的DbSet上调用Remove（）似乎并没有删除它应该删除的对象。返回简单的Contains（）布尔之后，检查我的设置。

尝试以不同的方式模拟它，但似乎没有一个起作用

我的DbSet模拟助手：

public static Mock<DbSet<T>> CreateDbSetMock<T>(IEnumerable<T> elements) where T : class
        {
            var elementsAsQueryable = elements.AsQueryable();
            var dbSetMock = new Mock<DbSet<T>>();

            dbSetMock.As<IQueryable<T>>().Setup(m => m.Provider).Returns(elementsAsQueryable.Provider);
            dbSetMock.As<IQueryable<T>>().Setup(m => m.Expression).Returns(elementsAsQueryable.Expression);
            dbSetMock.As<IQueryable<T>>().Setup(m => m.ElementType).Returns(elementsAsQueryable.ElementType);
            dbSetMock.As<IQueryable<T>>().Setup(m => m.GetEnumerator()).Returns(elementsAsQueryable.GetEnumerator());

            return dbSetMock;
        }
    }

我要测试的方法：

public virtual async Task<bool> DeleteSupplierAsync(User user)
        {
            var currentRoles = await _userManagerWrap.GetRolesForUser(_userManager, user);
            if (!currentRoles.Contains(nameof(Role.Supplier)))
            {
                throw new ArgumentException("Provided user does not belong to Suppliers");
            }
            var brand = GetBrandForUser(user);
            if (brand != default(Brand))
            {
                var users = _context.Users.Where(e => e.BrandId == brand.Id).ToList();
                _context.Users.RemoveRange(users);
                _context.Brands.Remove(brand);
            }
            else
            {
                _context.Users.Remove(user);
            }
            await _context.SaveChangesAsync();
//In the next line Users still contains the user i want to remove
            return !_context.Users.Contains(user);
        }

我的测试：

public async Task DeleteSupplierAsyncTest(IList<string> rolesToReturn, Brand brandToReturn, List<User> usersToReturn, List<Brand> brandsToReturn, string userIdToDelete, bool expectedException, string expectedMessage, bool expectedResult)
        {
            var userManagerMock = new Mock<UserManagerWrap>();
            userManagerMock.Setup(m => m.GetRolesForUser(It.IsAny<UserManager<User>>(), It.IsAny<User>())).Returns(Task.FromResult(rolesToReturn));

            var appDbContextMock = new Mock<AppDbContext>();

            var userTableMock = TestsHelper.CreateDbSetMock(usersToReturn);
            var brandsTableMock = TestsHelper.CreateDbSetMock(brandsToReturn);

            appDbContextMock.Setup(m => m.Users).Returns(userTableMock.Object);
            appDbContextMock.Setup(m => m.Brands).Returns(brandsTableMock.Object);

            var userServiceMock = new Mock<UserService>(appDbContextMock.Object, null, null, new Mock<IOptions<TokenSettings>>().Object, null, null, new Mock<IOptions<AzureAdClaimTypes>>().Object, userManagerMock.Object, null, null) { CallBase = true };

            userServiceMock.Setup(m => m.GetBrandForUser(It.IsAny<User>())).Returns(brandToReturn);

            if (expectedException)
            {

                var ex = Assert.ThrowsAsync(Is.AssignableTo(typeof(Exception)), () => userServiceMock.Object.
                DeleteSupplierAsync(null));
                Assert.AreEqual(expectedMessage, ex.Message);
            }
            else
            {
                var user = userTableMock.Object.First(x => x.Id == userIdToDelete);

                var result = await userServiceMock.Object.DeleteSupplierAsync(user);
                Assert.AreEqual(expectedResult, result);
            }
        }

当对象成功从集合中移除时，我期望输出为true，因此当方法返回true时。

模拟的DbSet似乎无法正常工作

0 个答案: