使用PowerMock模拟私有字段和私有方法_powermock set private field

要模拟的类：

public class PrivateObject {

    private String privateString;

    public PrivateObject(String privateString) {
 this.privateString = privateString;
    }

    private String getPrivateString() {
 return this.privateString;
    }

}
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使用PowerMock模拟：

// 类实例（class instance）
PrivateObject instance = new PrivateObject ();

// 模拟私有字段/变量（private field/variable）
MemberModifier
                .field(PrivateObject .class, "privateString").set(
  instance , "hellomock");

// 模拟私有方法（private method）
MemberModifier
  .stub(MemberMatcher.method(PrivateObject .class,
   "getPrivateString"))
  .toReturn(
   "Power Mock");
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