Test-Driven Development

The goal of these exercises is to practise test-driving your code following the RED-GREEN-REFACTOR cycle.

For the exercises below, we've provided the starter project above.

🐝 FizzBuzz

Create a class FizzBuzz with a get method that takes a number and returns a string, but such that:

• for multiples of 3, it returns “Fizz” instead of the number
• for multiples of 5, it returns “Buzz” instead of the number
• for multiples of 15, it returns “FizzBuzz” instead of the number
• the string representation of the number otherwise

Input	Output
1	"1"
2	"2"
3	"Fizz"
4	"4"
5	"Buzz"
6	"Fizz"
7	"7"
8	"8"
9	"Fizz"
10	"Buzz"
11	"11"
12	"Fizz"
13	"13"
14	"14"
15	"FizzBuzz"
...	...

🗓️ Leap Year

Create a class Year with a isLeap method that checks whether its input integer is a Leap Year or not:

• years divisible by 400 are leap years
• years divisible by 100 but not by 400 are not leap years
• years divisible by 4 but not by 100 are leap years
• years not divisible by 4 are not leap years

Input	Output
1700	false
1800	false
1900	false
2000	true
2001	false
2002	false
2003	false
2004	true
2005	false
2006	false
2007	false
2008	true
2009	false
2010	false
2011	false
...	...

⌨️ Character Copier

A CharacterCopier is a simple class that reads characters from a Source and copies them to a Destination one character at a time. When the copy method is called on the copier then it should read characters from the source and copy them to the destination until the source returns a new line (\n).

Implement the character copier using test doubles for the source and the destination.

• Iteration 1: try using spies (write your test doubles manually)
• Iteration 2: try using mocks (using Mockito).

Start from the definitions on the diagram.