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2. [Extra] 100 fish
How long will they take to catch all fish?
Less than 1 hour
Around 1 hour
About 100 hours
Forever
If 100 people trying to catch 100 piranha fish in a lake. On average, one person can catch one fish within 1 hour

3. [Extra] 100 fish

4. System testing
SUT

6. System testing
SUT

7. System testing
SUT

8. [Extra] who wants maximum publicity
Do you want maximum publicity for your mistakes?

9. [Extra] who wants maximum publicity
Do you want maximum publicity for your mistakes?

10. CS2103/T, Lecture 4, Part 2, [Sep 2, 2016]
Never too early to test:
An Introduction to Early Developer Testing
CS2103/T, Lecture 4, Part 2, [Sep 2, 2016]

11. MSLogic
Unit testing
History UI
MSLogic
History UI
Storage
Storage

12. MSLogic
Unit testing
History UI
MSLogic
History UI
Storage
Storage

13. Unit testing Test Driver String item = msLogic.getItem(1);UI
Test Driver
SUT== MSLogic
MSLogic
History
Storage
String item = msLogic.getItem(1);
if(!item.equals(“Item1”) print(“Case 1 failed”); …

14. Unit testing Test Driver String item = msLogic.getItem(1);UI
Test Driver
SUT== MSLogic
MSLogic
History
Storage
String item = msLogic.getItem(1);
if(!item.equals(“Item1”) print(“Case 1 failed”); …

15. Testing frameworks String item = msLogic.getItem(1);
if(!item.equals(“Item1”) print(“Case 1 failed”); …
Testing frameworks
assertEquals(msLogic.getItem(1), “Item1”);
JUnit

18. Unit testing Developer testing Automated A type of UI History MSLogic
Storage
Developer testing
A type of

19. Test-Driven Development (TDD)
SUT

20. Test-Driven Development (TDD)
Write a failing test
Write code to pass test

21. CityConnectTest.java
CityConnect.java

22. CityConnectTest.java
CityConnect.java

23. Write the java code for the above
CityConnectTest.java
CityConnect.java
We want have this.
Clementi  true
Novena  true
Eunos  true
Changi  false
Clementi, Eunos, 20
Eunos, Novena, 40
Write the java code for the above

24. CityConnectTest.java CityConnect.java
But, we are not going to write it at first.

25. CityConnectTest.java
CityConnect.java

26. CityConnectTest.java
CityConnect.java

27. CityConnectTest.java
CityConnect.java

28. CityConnectTest.java
CityConnect.java

29. CityConnectTest.java
CityConnect.java

30. CityConnectTest.java
CityConnect.java

31. CityConnectTest.java
CityConnect.java

32. CityConnectTest.java
CityConnect.java

33. CityConnectTest.java
CityConnect.java

34. CityConnectTest.java
CityConnect.java

35. CityConnectTest.java
CityConnect.java

36. CityConnectTest.java
CityConnect.java

37. CityConnectTest.java
CityConnect.java

38. CityConnectTest.java
CityConnect.java

39. CityConnectTest.java
CityConnect.java

40. CityConnectTest.java
CityConnect.java

41. CityConnectTest.java
Note: more test cases required.
CityConnect.java
Refactor as necessary.

42. Test-Driven Development (TDD)
Write a failing test
Write code to pass test

45. 125,000 Lines of Code
100+ developers

47. Automated tests

48. [extra] Mozilla patch policy

49. When the system test fails...

50. Must have automated developer tests!

51. It can save your career.
Must do developer testing
Can do in TDD fashion
Only system testing? NO
Use automated test driver frameworks