[UnitTest] Unit Test 测试非public变量/方法[转载]

最新推荐文章于 2024-02-29 14:09:59 发布

sakurapurple

最新推荐文章于 2024-02-29 14:09:59 发布

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分类专栏： JUnit4 转载文章标签： JUnit UnitTest

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本文介绍了一种在不允许更改方法可见性的情况下测试私有方法的方法。通过使用Java反射API，可以访问并调用私有方法及修改私有字段。文章提供了获取私有方法和字段的具体步骤。

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From: http://stackoverflow.com/questions/34571/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes

If you have somewhat of a legacy application, and you're not allowed to change the visibility of your methods, the best way to test private methods is to use reflection.

Internally we're using helpers to get/set private and private static variables as well as invoke private and private static methods. The following patterns will let you do pretty much anything related to the private methods and fields. Of course you can't change private static finalvariables through reflection.

Method:

Method method = targetClass.getDeclaredMethod(methodName, argClasses);
method.setAccessible(true);
return method.invoke(targetObject, argObjects);

Field:

Field field = targetClass.getDeclaredField(fieldName);
field.setAccessible(true);
field.set(object, value);

Notes:
* targetClass.getDeclaredMethod(methodName, argClasses) lets you look into private methods. The same thing applies for getDeclaredField.
* The setAccessible(true) is required to play around with privates.