Merge pull request #7 from MarcL/day6

Day 6 : Simplify and automate your tests

Merge pull request #6 from MarcL/day5-new

Day 5 : GitHub Stargazing with Spies & Stubs

Merge pull request #5 from MarcL/day4

Day 4 : Time Travel with Fake Timers

Merge pull request #4 from MarcL/day3

Day 3 : Asynchronous Tests

Merge pull request #1 from MarcL/day2

Day 2 : Initial setup + basic tests