A presentation given to Quality Assurance Testers, about Test Driven Development/Design. What it is, where the tests fit in the pipeline and what it means to developers and testers.

1. For
Testers
Sarah & Dewald
Usher Viljoen

2. ’ ?
Input Process
Actual
Output
Expected
Output
2

3. 2
3
Write
Test
Refactor
Write
code
3

4. 2
3
Write
Test
Refactor
Write
code
4

5. Write
Test
Refactor
See test fail
See test pass
2
3
Write
code
5

6. 6

7. 7

8. 58
API
External
API
External
APIPrivate int CreditRatingAlgorithm (
double AmountOwned, double PaymentHistoryScore,
double CreditHistoryScore){
return (AmountOwed + PaymentHistoryScore +
CreditHistoryScore) / 3 * 100
}
8

9. 58
API
External
API
External
APIPrivate int CreditRatingAlgorithm (
double AmountOwned, double PaymentHistoryScore,
double CreditHistoryScore){
return (AmountOwed + PaymentHistoryScore +
CreditHistoryScore) / 3 * 100
}
U
I I
I
I
9

10. 58
API
External
API
External
API
Private int CreditRatingAlgorithm …
U
I I
I
I
Acceptance Test - Scenario 10

11. Source
Control
Production
Build
Unit
Tests
Integration
Tests
Acceptance
Tests
Check out
and Build
Run Tests
11

12. SC PB U
I
A
Passes
Tests
-
12

13. Test-Driven-
/
Design
Interface designs are
13

14. ’ ?
- Write the test code with a specific intent
- Write the production code
14

15. 15

16. ’
- Help decide on the intent
- Think edge cases which could affect the
design
- Pairing with the developer
- Understand what the program is trying
to do
- Spot any cases missed by the developer
- Understand how a design change may
affect tests 16

17. - Test, Code, Refactor
- Testing is the QA and Dev collaboration point.
- QAs can help design better intentions, spot
flaws and edge cases that have been missed.
- QAs can better understand how design
changes can affect tests down the (pipe)line.
TDD is a DESIGN tool. Is does not replace the
testing work that is required in a project.
17

18. 18

19. *http://programmers.stackexchange.com/quest
ions/258311/if-we-have-tdd-and-bdd-why-do-
we-need-qa-for
http://agiledata.org/essays/tdd.html
http://www.ministryoftesting.com/2014/08/tdd-
testers/
http://blog.drorhelper.com/2010/05/why-tdd-is-
good-for-testers.html 19

20. Code sample.
20