Test Driven Development

Code

Unit Tests

• Separate (non production) program/code to test your code
• Test your code on the lowest (unit) layer
• General 3 step structure of a unit test
  • Given: Setup unit and environment
  • When: Execute unit to test
  • Then: Test for expected result

Why Tests

Michael Feathers, Working Effectively with Legacy Code

“To me, legacy code is simply code without tests.”

TDD

• Write your test before your production code
• 3 Phases
  • Red Phase: Define a failing test
  • Green Phase: Fix that test (Solve Simple)
  • Refactoring: Clean up your code

FizzBuzz Task

Write a function that returns the number it was given or Fizz if it is multiple of 3, Buzz if it is multiple of 5 or FizzBuzz if it is multiple of both.

C++ | Python

Task Definition

1. Can call function fizzBuzz
2. Return 1 for 1
3. Return 2 for 2
4. Return Fizz for 3
5. Return Buzz for 5
6. Return Fizz for 6
7. Return Buzz for 10
8. Return FizzBuzz for 15

Questions?

Try yourself