实体框架 6 模拟包含 dbset 上的方法

Entity framework 6 mocking include method on dbset(实体框架 6 模拟包含 dbset 上的方法)

问题描述

一直在谷歌上搜索有关如何在 EF6 中模拟 dbset 上的 include 方法的问题的解决方案.这个问题在这里有很好的记录:-

Have been googling for a solution to the problem on how to mock the include method on dbset in EF6. The problem is well documented here :-

http://entityframework.codeplex.com/discussions/461731

很遗憾，尽管其中似乎没有有效的解决方案.

Unfortunately though there does not seem to be a valid solution in there.

有没有人找到解决方法?

Has anyone found a workaround to this?

我明白我们不应该真的嘲笑 EF6 上下文，但项目负责人坚持这样做.

I do understand that we shouldn't really be mocking the EF6 context, but the project lead has insisted on it.

提前致谢.

推荐答案

所以，如果有点小问题，这是可能的！

So, this is possible if a bit of a faff!

在下面我设置了模拟上下文并设置并且可以成功调用包含.我认为秘诀在于对 Provider、Expression 和 GetEnumerator 的调用进行存根，并将存根上下文上的 DbSet 属性设置为存根集，而不是将上下文存根以返回它们.

In the below I setup the mock context and sets and can call include successfully. I think that the secret sauce is in stubbing the calls through to Provider, Expression and GetEnumerator and in setting the DbSet properties on the stubbed context to the stubbed sets and not stubbing the context to returning them.

GitHub 上有一个可运行的示例

    [Test]
    public void CanUseIncludeWithMocks()
    {
        var child = new Child();
        var parent = new Parent();
        parent.Children.Add(child);

        var parents = new List<Parent>
            {
                parent
            }.AsQueryable();

        var children = new List<Child>
            {
                child
            }.AsQueryable();

        var mockContext = MockRepository.GenerateStub<TestContext>();

        var mockParentSet = MockRepository.GenerateStub<IDbSet<Parent>>();
        var mockChildSet = MockRepository.GenerateStub<IDbSet<Child>>();

        mockParentSet.Stub(m => m.Provider).Return(parents.Provider);
        mockParentSet.Stub(m => m.Expression).Return(parents.Expression);
        mockParentSet.Stub(m => m.GetEnumerator()).Return(parents.GetEnumerator());

        mockChildSet.Stub(m => m.Provider).Return(children.Provider);
        mockChildSet.Stub(m => m.Expression).Return(children.Expression);
        mockChildSet.Stub(m => m.GetEnumerator()).Return(children.GetEnumerator());

        mockContext.Parents = mockParentSet;
        mockContext.Children = mockChildSet;

        mockContext.Parents.Should().HaveCount(1);
        mockContext.Children.Should().HaveCount(1);

        mockContext.Parents.First().Children.FirstOrDefault().Should().NotBeNull();

        var query = mockContext.Parents.Include(p=>p.Children).Select(pc => pc);

        query.Should().NotBeNull().And.HaveCount(1);
        query.First().Children.Should().NotBeEmpty().And.HaveCount(1);

    }

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