Topics in Software Development

1. Test Driven Development
Comp 645
Topics in Software Development
Presented by: Rashmi Srivastava
Franklin University, Summer 2018

2. Agenda
 What is TDD & TDD Cycle
 Advantages
 How to perform TDD Test
 Example Test Driven Development
 Summary
 References

3. What is TDD
 Test-driven development (TDD), is an new age
evolutionary approach to development which
emphasizes test-first development.
 It starts with designing and developing tests for every
small functionality of an application.
 Key Point: The test is written first, imagining the code
to be tested is written.
 TDD cycle
 Write a test
 Make it run
 Change code to make it right i.e. Refactor
 Repeat process

4. Advantages Includes
 The unit tests actually get written
 Programmer satisfaction leading to more consistent test writing
 Clarification of detailed interface and behavior
 Provable, repeatable, automated verification
 The confidence to change things

5. How to perform TDD Test
 see the rhythm of test-driven
development
 Add a test.
 Run all tests and see if any new
test fails.
 Write some code.
 Run tests and Refactor code.
 Repeat.

6. Example Test Driven
Development
 Requirements
 passwords meet the following
criteria
 Between 6 and 10 characters
long
 Contain at least one digit
 Contain at least one upper
case letter

7. Write the code

8. TDD Example: Refactoring #1

9. TDD Example: Refactoring #2

10. Final code

11. Final Test class

12. Summary  What is TDD & its Advantages
 Example Test Driven Development

13. References
 http://agiledata.org/essays/tdd.html
 Larman, C. (2004). Applying UML and patterns: An introduction to object-
oriented analysis and design and iterative development. (3rd).