嘲讽的对象，而不会用C无参数的构造＃/。NET [英] Mocking objects without no-argument constructor in C# / .NET

问题描述

是否有可能建立从类的模拟不提供一个无参数的构造函数，不传递任何参数的构造？也许动态创建IL？

Is it possible to create a mock from a class that doesn't provide a no-argument constructor and don't pass any arguments to the constructor? Maybe with creating IL dynamically?

的背景是，我不想定义接口仅用于测试。解决方法是提供用于测试的无参数的构造。

The background is that I don't want to define interfaces only for testing. The workaround would be to provide a no-argument constructor for testing.

推荐答案

当然可以。在这个例子中我将使用起订量，一个真正真棒嘲弄库

Sure thing. In this example i'll use Moq, a really awesome mocking library.

例如：

public class MyObject
{
     public MyObject(object A, object B, object C)
     {
          // Assign your dependencies to whatever
     }
}

Mock<MyObject> mockObject = new Mock<MyObject>();
Mock<MyObject> mockObject = new Mock<MyObject>(null, null, null); // Pass Nulls to specific constructor arguments, or 0 if int, etc

在很多情况下，虽然，我分配模拟对象作为参数，所以我可以测试的依赖关系：

In many cases though, I assign Mock objects as the arguments so I can test the dependencies:

Mock<Something> x = new Mock<Something>();
MyObject mockObject = new MyObject(x.Object);

x.Setup(d => d.DoSomething()).Returns(new SomethingElse());

etc

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