PowerMock可以为测试用例实例化内部类吗？ [英] Can PowerMock instantiate an inner class for test cases?

问题描述

我正在尝试测试一个包含多个私有类的类（是的，我知道这通常被认为是可测试性的不良实践，但这个问题与设计原则无关）。我的课程看起来像这样：

I'm attempting to test a class with a number of private classes (yes, I know this is generally considered poor practice for testability, but this question is not in regards to design principles). My class would look something like this:

public class EnclosingClass {
  .
  .
  .
  private class InnerClass implements InnerClassType {
     public InnerClass(){ /* do stuff */}
     public int InnerClassMethod();
  }
}

• InnerClassType 是一个公共接口


• InnerClassType is a public interface

我已经尝试通过执行以下方法用powermock实例化类： / p>



I've tried instantiating the classes with powermock by doing:

Class clazz = Whitebox.getInnerClassType(EnclosingClass.class, "InnerClass");
Constructor constructor = Whitebox.getConstructor(clazz, null);
InnerClassType innerClass = (InnerClassType) constructor.newInstance(null);

以及：

Class clazz = Whitebox.getInnerClassType(EnclosingClass.class, "InnerClass");
InnerClassType innerClass = (InnerClassType) Whitebox.invokeConstructor(clazz);

然而，在两次尝试中我得到 ConstructorNotFoundException

However, on both attempts I get a ConstructorNotFoundException

是否可以实例化这些内部类？如果是这样，我哪里出错了？

Is it possible to instantiate these inner classes? If so, where am I going wrong?

推荐答案

您应该可以通过以下mod将您的ConstructorNotFoundExeception移到第一个努力：

You should be able to move past your ConstructorNotFoundExeception via the following mods to your first effort:

Class clazz = Whitebox.getInnerClassType(EnclosingClass.class, "InnerClass");
Constructor constructor = Whitebox.getConstructor(clazz, EnclosingClass.class);
InnerClassType innerClass = (InnerClassType) constructor.newInstance(new EnclosingClass());

由于你的内部类不是静态的，它隐含地期望来自外部类的this引用。使用这种方法，看起来你必须明确它。

Since your inner class is not static, it implicitly expects a "this" reference from the outer class. Using this method, looks like you have to get explicit with it.

这篇关于PowerMock可以为测试用例实例化内部类吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！