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package math;

class Counter {

    private int counter;

    Counter() {
        counter = 0;
    }

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    @Test
    public void whenDecrementTwice_thenCounterIsMinusTwo() {
        final int expected = -2;
        final int actual = sut.decrement().decrement().getCounter();
        assertEquals(expected, actual);
    }

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package pet;

class Dog {

    private static final String DEFAULT_NAME = "Spot";

    private String name;

    Dog(String name) {
        if (null == name) {

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    Dog(String name) {
        this.name = DEFAULT_NAME;
    }

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class Coordinate

  attr_accessor :id, :x, :y, :area, :blacklisted

  def initialize(x, y, id)
    @id = id
    @x = x
    @y = y
    @area = 0
    @blacklisted = false

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class Coordinate

  attr_accessor :id, :x, :y, :area, :blacklisted

  def initialize(x, y, id)
    @id = id
    @x = x
    @y = y
    @area = 0
    @blacklisted = false