Xunit

Question

我正在尝试使用 AutoMoq 和 Xunit 自动执行单元测试以插入功能。

但我不断了解到无法将值插入到 KeyColumn 中，如下所示。 EnrolmentRecordID 是我的 SQL 数据库中的 IdentityColumn，它的值是在插入时自动生成的。

Message: Microsoft.EntityFrameworkCore.DbUpdateException : An error occurred while updating the entries. See the inner exception for details. ---- System.Data.SqlClient.SqlException : Cannot insert explicit value for identity column in table 'EN_Schedules' when IDENTITY_INSERT is set to OFF.

如果我不使用 Moq 或不将数据设置到 EnrolmentRecordID 列，则可以避免。但我不知道如何在 AutoMoq 中排除 EnrolmentRecordID。因为它是关键列，所以我也不能为该列设置 NULLABLE 特性。

StudentSchedule.cs

public class StudentSchedule
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int EnrolmentRecordID { get; set; }

    public string AcademicYearID { get; set; }
    [Display(Name = "Student")]
    public string StudentName { get; set; }

    public string ProposedQual { get; set; }

    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public DateTime? DateCreated { get; set; }
}

添加服务

public async Task Add(StudentSchedule model)
{
    await _context.Schedules.AddAsync(model);
    await _context.SaveChangesAsync();
}

XUnitTest

public class TestCommandsSchedule
{
    private ERAppData.Commands.CommandSchedule _command;
    public TestCommandsSchedule()
    {
        _command = new ERAppData.Commands.CommandSchedule(AppsecDBContext.GenerateAppsecDBContext() as ERAppData.DbContexts.AppsecDbContext);
    }

    [Theory]
    [AutoMoqData]
    public async Task Should_Add_Schedule(StudentSchedule model)
    {            
        model.AcademicYearID = "16/17";
        model.DateCreated = null;

        await _command.Add(model);

        Assert.True(model.EnrolmentRecordID > 0);
    }
}

能否请您帮助我如何使用 Moq 生成 MockObject 并测试 Add 服务？谢谢。

Answer 1

这个简化的示例展示了如何将被测对象与具体对象分离，以便它可以单独进行单元测试。

摘掉 DbContext

public interface IStudenScheduleService : IGenericRepository<StudentSchedule> {
}

public interface IGenericRepository<T> {
    Task<T> AddAsync(T value, CancellationToken cancellationToken = default(CancellationToken));
    Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));
}

确保实现包装实际上下文并提供所需的功能。

让主题class依赖抽象。

public class CommandSchedule {
    private readonly IStudenScheduleService _context;

    public CommandSchedule(IStudenScheduleService context) {
        this._context = context;
    }

    public async Task Add(StudentSchedule model) {
        await _context.AddAsync(model);
        await _context.SaveChangesAsync();
    }
}

有了这个，被测对象的依赖关系就可以被模拟并用于练习测试。

[Theory]
[AutoMoqData]
public async Task Should_Add_Schedule(StudentSchedule model)  
   //Arrange
    var expectedId = 0;
    var expectedDate = DateTime.Now;

    var context = new Mock<IStudenScheduleService>();
    context.Setup(_ => _.SaveChangesAsync(It.IsAny<CancellationToken>()))
        .ReturnsAsync(1)
        .Callback(() => {
            model.EnrolmentRecordID = ++expectedId;
            model.DateCreated = expectedDate;
        })
        .Verifiable();

    context.Setup(_ => _.AddAsync(It.IsAny<StudentSchedule>(), It.IsAny<CancellationToken>()))
        .ReturnsAsync((StudentSchedule m, CancellationToken t) => m)
        .Verifiable();

    var _command = new CommandSchedule(context.Object);

    model.AcademicYearID = "16/17";
    model.DateCreated = null;

    //Act
    await _command.Add(model);

    //Assert
    context.Verify();
    Assert.AreEqual(expectedId, model.EnrolmentRecordID);
    Assert.AreEqual(expectedDate, model.DateCreated);
}

Xunit - 如何使用 Moq 和 EF Core 作为身份主键

Xunit - How to use Moq and EF Core for Identity Primary Key

c#

moq

entity-framework-core