As you’re a very friendly person, you would like to send a birthday note to all the friends you have. But you have a lot of friends and a bit lazy, it may take some times to write all the notes by hand.
The good news is that computers can do it automatically for you.
Imagine you have a flat file with all your friends :
last_name, first_name, date_of_birth, email Doe, John, 1982/10/08, email@example.com Ann, Mary, 1975/09/11, firstname.lastname@example.org
And you want to send them a happy birthday email on their birth date :
Subject: Happy birthday! Happy birthday, dear <first_name>!
How would this software look like ? Try to implement it so you can easily change :
- the way you retrieve the friends data (for instance, try switching to a SQLite Db)
- the way you send the note : (for instance, imagine you want to send SMS instead of emails)
What kind of tests would you write ? Would you use Mocks ?
Friends born on February, 29th should have their Birthday greeted on February, 28th
Send a Birthday Reminder note when it is someone else birthday :
Subject: Birthday Reminder Dear <first_name>, Today is <someone_else_first_name> <someone_else_last_name>'s birthday. Don't forget to send him a message !
Send a single Birthday Reminder note
Subject: Birthday Reminder Dear <first_name>, Today is <full_name_1>, <full_name_2> and <full_name_3>'s birthday. Don't forget to send them a message !
This kata is largely inspired by the work of Matteo Vaccari in http://matteo.vaccari.name/blog/archives/154