<?php

private $collection;
const ONE = 1;
const KLASS = 'Collection';
const ELEMENT = 'any element';
const PROPERTY = 'collection';

public function testSizeOfTheCollectionReflectsNewElements()
{
    $this->startWithAnEmptyCollection();

    $this->addAnyElementToTheCollection();

    $this->theSizeOfTheCollectionIsOne();
}

private function theSizeOfTheCollectionIsOne()
{
    $this->theSizeOfTheCollectionIs($this->one());
}

private function one()
{
    return self::ONE;
}

private function startWithAnEmptyCollection()
{
    $this->setProperty($this->aProperty(), $this->anEmptyCollection());
}

private function aProperty()
{
    return self::PROPERTY;
}

private function setProperty($name, $value)
{
    $this->{$name} = $value;
}

private function anEmptyCollection()
{
    return new $this->aClass;
}

private function aClass()
{
    return self::KLASS;
}

private function addAnyElementToTheCollection()
{
    $this->theCollection()->add($this->anyElement());
}

private function anyElement()
{
    return self::ELEMENT;
}

private function theSizeOfTheCollectionIs($size)
{
    $this->assertSame($size, $this->theSizeOfTheCollection());
}

private function theSizeOfTheCollection()
{
    return count($this->theCollection());
}

private function theCollection()
{
    return $this->collection;
}