The document introduces the JUnit testing framework and discusses how automatic unit testing can help save time by dividing testing into smaller units and providing a uniform testing tool. It explains that unit testing involves dividing code into classes or related classes, then writing test cases that specify conditions, states, and behaviors to test before and after each change is made to verify expected results. The document also outlines the three steps - arrange, act, and assert - for writing test cases to set up object snapshots, invoke methods to create changes, and check final states match expectations.

1. Introduction Unit Testing Framework

2. System.out.println("Bug or But");

3. logger.info("Bug or But");

4. How to find the information in so many messages ?

5. Watch the var by debugger, but ...... manually

6. Can testing save your life ?

7. Automatic unit testing can save your life !

8. Automatic => uniform testing tool Unit testing => divide and conquer

9. JUnit Testing `Framework' Framework => almost completed except for … You must write Test Case

10. Eating Framework with CookCallback/Strategy http://www.bubbleliao.idv.tw/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=11702&g2_serialNumber=1

11. In OO-System What are Unit and Test Case ?

12. Unit => A class Or related Classes Test Case => condition, state, behavior

13. DO TEST Make a change to a runtime object snapshot Assert Before => Condition, State, Behavior <= After

14. Write Test Case in AAA, 3 steps A rrange, A ct and A ssert

15. Arrange Simulate a runtime object snapshot Create a instance to set up its state and related object

16. Act Send messages to object (invoke the method) (make a change)

17. Assert Check state in object is just what you expect