What"s the proper way to test a class with private methods using JUnit?

How do I use JUnit to test a class that has internal private methods? It seems bad to change the access modifier for a method just to be able to run a test.

IntelliJ IDEA with Junit 4.7 "!!! JUnit version 3.8 or later expected:”

When I attempt to run the following test in IntelliJ IDEA I get the message:

How to run all tests belonging to a certain Category in JUnit 4

JUnit 4.8 contains a nice new feature called "Categories" that allows you to group certain kinds of tests together. This is very useful, e.g. to have separate test runs for slow and fast tests. I know the stuff mentioned in JUnit 4.8 release notes , but would like to know how I can actually run all the tests annotated with certain category.

Can I test status bar notifications using Android"s testing framework?

I have a class that sends a status bar notification in Android. I can't find a way to test whether the notification was sent or not, which makes it very hard to write any kind of useful unit test.

differences between 2 JUnit Assert classes

I've noticed that the JUnit framework contains 2 Assert classes (in different packages, obviously) and the methods on each appear to be very similar. Can anybody explain why this is?

Robotium side scroll not working for me

I want to scroll left/right on an android application using a Robotium/Junit test.

How should I be creating classes when doing TDD

I have started doing TDD and I am unsure if I am doing it correctly. I have made a Question class and a QuestionTest. The Question class has an addAnswer method that takes an instance of the Answer class. Now, should I be creating only the class Answer and use the default constructor. Or should I be making the Answer class and also provide the constructor with parameters?