自动修复在复杂对象中创建不必要的深度

问题描述 投票：1回答：2

我有一个复杂的图，来自EF6（数据库优先），我想在测试域模型时使用模拟和测试治具进行模拟。为了防止循环依赖问题，我将以下几行添加到了测试设置中：

private Fixture _fixture;
public WhenRetrievingPlans()
{
    _fixture = new Fixture();
    _fixture.Behaviors.OfType<ThrowingRecursionBehavior>().ToList()
                            .ForEach(b => _fixture.Behaviors.Remove(b)); 
    _fixture.Behaviors.Add(new OmitOnRecursionBehavior());
    using (var writer = new StreamWriter(@"D:\Workspace\Project\source\Project.Model.Test\trace.txt"))
    {
        _fixture.Behaviors.Add(new TracingBehavior(writer));

然后，我尝试阻止灯具尝试将对象图追逐到遗忘之中，而仅创建一个没有任何子对象的简单对象，就像这样：

        _fixture.Build<EntityType>()
            .Without(e => e.ObjectProperty1)
            .Without(e => e.ObjectProperty2)
            .Without(e => e.CollectionProperty3)
            .Without(e => e.CollectionProperty4)
            .Without(e => e.ObjectProperty5)
            ...
            .Create();

因此，不会创建作为此EntityType属性的对象或集合。其余属性是简单类型，包括一些Nullable和DateTime值以及Int32和String类型。

我想让AutoFixture创建EntityType的实例，然后计划从Mock返回它。 （这可能不相关。）

        var entitiesDbSetMock = new Mock<IDbSet<EntityType>>();
        entitiesDbSetMock.SetupAllProperties();
        _fixture.Inject<IDbSet<EntityType>>(entitiesDbSetMock.Object);

然后将对象添加到此Mock：

        var entity = _fixture.Create<EntityType>();
        entitiesDbSetMock.Object.Attach(entity);

问题是这样的：即使使用了我使用的所有.Without()操作，AutoFixture都不会阻止自己生成从此EntityType可以访问的每个可能的对象。我怎么知道？因为我打开了跟踪。仅就此一次Create操作而言，就生成了将近750,000行的跟踪（这是一个100MB的文件）。

在阅读跟踪信息时，第一部分显示了EntityType的创建以及我没有排除的所有属性的设置。但是在创建该东西之后，它似乎立即又被创建了，但是这一次它忽略了我的Without()自定义，并且深入了。

Requested: Ploeh.AutoFixture.Kernel.SeededRequest
  Requested: Project.Data.EntityType
    Requested: Int32 EntityTypeID
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.Int32
        Created: 232
      Created: 232
    Created: 232
    Requested: System.Nullable`1[System.Int32] ForeignKey1ID
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.Nullable`1[System.Int32]
          Requested: Int32 value
            Requested: Ploeh.AutoFixture.Kernel.SeededRequest
              Requested: System.Int32
              Created: 224
            Created: 224
          Created: 224
        Created: 224
      Created: 224
    Created: 224
    Requested: Int32 Property2ID
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.Int32
        Created: 40
      Created: 40
    Created: 40
    Requested: System.DateTime Property3Date
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.DateTime
        Created: 6/6/2014 4:05:24 PM
      Created: 6/6/2014 4:05:24 PM
    Created: 6/6/2014 4:05:24 PM
    *... (similar lines elided for brevity)*
    Requested: Project.Data.OtherEntity OtherEntity
    Created: Ploeh.AutoFixture.Kernel.OmitSpecimen
    Requested: Project.Data.YetAnotherEntity YetAnotherEntity
    Created: Ploeh.AutoFixture.Kernel.OmitSpecimen
    Requested: System.Collections.Generic.ICollection`1[Project.Data.CollectionEntity] CollectionEntities
    Created: Ploeh.AutoFixture.Kernel.OmitSpecimen
    *... (similar lines elided for brevity)*
  Created: Project.Data.EntityType
Created: Project.Data.EntityType

就在那儿，我希望跟踪完成。创建对象，正是我想要的。但这并不止于此。紧接着，我看到AutoFixture继续运行。

Requested: Ploeh.AutoFixture.Kernel.SeededRequest
  Requested: Project.Data.YetAnotherEntity
  Created: Project.Data.YetAnotherEntity
Created: Project.Data.YetAnotherEntity
Requested: Ploeh.AutoFixture.Kernel.SeededRequest
  Requested: Project.Data.UnrelatedEntity
  Created: Project.Data.UnrelatedEntity
Created: Project.Data.UnrelatedEntity
Requested: Ploeh.AutoFixture.Kernel.SeededRequest
  Requested: Project.Data.EntityType  *<<-- Again? We did this already.*
    Requested: Int32 EntityTypeID
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.Int32
        Created: 107
      Created: 107
    Created: 107
    Requested: System.Nullable`1[System.Int32] ForeignKey1ID
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.Nullable`1[System.Int32]
          Requested: Int32 value
            Requested: Ploeh.AutoFixture.Kernel.SeededRequest
              Requested: System.Int32
              Created: 87
            Created: 87
          Created: 87
        Created: 87
      Created: 87
    Created: 87
    Requested: Int32 Property2ID
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.Int32
        Created: 105
      Created: 105
    Created: 105
    Requested: System.DateTime Property3Date
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: System.DateTime
        Created: 5/31/2014 6:50:10 PM
      Created: 5/31/2014 6:50:10 PM
    Created: 5/31/2014 6:50:10 PM
    Requested: Project.Data.OtherEntity OtherEntity  *<<!! NO! I stopped you!*
      Requested: Ploeh.AutoFixture.Kernel.SeededRequest
        Requested: Project.Data.OtherEntity
          Requested: Int32 ForeignKey1ID
            Requested: Ploeh.AutoFixture.Kernel.SeededRequest
              Requested: System.Int32
              Created: 168
            Created: 168
          Created: 168
          Requested: System.String Name
            Requested: Ploeh.AutoFixture.Kernel.SeededRequest
              Requested: System.String
              Created: 61eb26e3-890d-4d0d-badd-cd3467c299ed
            Created: Name61eb26e3-890d-4d0d-badd-cd3467c299ed
          Created: Name61eb26e3-890d-4d0d-badd-cd3467c299ed
          Requested: Int32 OtherEntityID
            Requested: Ploeh.AutoFixture.Kernel.SeededRequest
              Requested: System.Int32
              Created: 187
            Created: 187
          Created: 187
*... and on and on for 750,000 more lines.

当然，这些东西可能具有各种代码味道，而且我知道Mark Seemann在EF或任何其他ORM上并不重要。但是我认为它应该起作用，并且我无法弄清楚我错过了什么。

c# entity-framework-6 autofixture
2个回答
1
投票

现在，我将更仔细地查看示例以回答Mark的评论（谢谢，Mark !!）...我看到Build方法的返回值为T类型。 （前额额头）。

所以现在我看到我认为Build所做的事情是错误的。实际上，它在那里实例化了一个T。我怀疑我需要做的（创建模板）是通过扩展Sp​​ecimenBuilder并以某种方式注册它，方法是将其添加到设置治具的“自定义/自定义”序列中。

马克，如果您想留下更好的答案，我将等待一两天，然后选择您的答案作为正确答案。

0
投票

尝试使用RepeatCount属性

var objFixture =新的Fixture（）;

objFixture.RepeatCount = 0;

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