PHPUnit and phpspec examples

MoneySpec.php

<?php
namespace spec\Money;

use PhpSpec\ObjectBehavior;
use Money\Currency;
use Money\Money;

class MoneySpec extends ObjectBehavior
{
    public function it_should_be_initializable(Currency $currency)
    {
        $this->beConstructedWith(100, $currency);
        $this->shouldHaveType('Money\Money');
    }

    // testDifferentCurrenciesCannotBeAdded
    public function it_should_throw_exception_when_adding_amounts_with_different_currencies()
    {
        $m2 = new Money(100, new Currency('USD'));

        $this->beConstructedWith(100, new Currency('EUR'));
        $this->shouldThrow('Money\InvalidArgumentException')->during('add', [$m2]);
    }

    // testSubtraction
    public function it_should_subtract_amounts_with_the_same_currency()
    {
        $m2 = new Money(200, new Currency('EUR'));

        $this->beConstructedWith(100, new Currency('EUR'));
        $diff = $this->subtract($m2);

        $diff->getAmount()->shouldBeEqualTo(-100);
        $diff->getCurrency()->shouldBeLike(new Currency('EUR'));

        $this->shouldNotBeEqualTo($m2);
        $this->shouldNotBeEqualTo($diff);
    }

    //testComparison
    public function it_should_be_able_to_compare_amounts_with_the_same_currency()
    {
        $this->beConstructedWith(1, new Currency('EUR'));
        $euro2 = new Money(2, new Currency('EUR'));

        $this->greaterThan($euro2)->shouldReturn(false);
        $this->lessThan($euro2)->shouldReturn(true);

        $this->compare($euro2)->shouldReturn(-1);
        $this->compare($this)->shouldreturn(0);
    }
}

MoneyTest.php

<?php
/**
 * This file is part of the Money library
 *
 * Copyright (c) 2011-2013 Mathias Verraes
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Money\Tests;

use PHPUnit_Framework_TestCase;
use Money\Money;
use Money\Currency;

class MoneyTest extends PHPUnit_Framework_TestCase
{
    /**
     * @expectedException Money\InvalidArgumentException
     */
    public function testDifferentCurrenciesCannotBeAdded()
    {
        $m1 = new Money(100, new Currency('EUR'));
        $m2 = new Money(100, new Currency('USD'));
        $m1->add($m2);
    }

    public function testSubtraction()
    {
        $m1 = new Money(100, new Currency('EUR'));
        $m2 = new Money(200, new Currency('EUR'));
        $diff = $m1->subtract($m2);
        $expected = new Money(-100, new Currency('EUR'));

        $this->assertEquals($expected, $diff);

        // Should return a new instance
        $this->assertNotSame($diff, $m1);
        $this->assertNotSame($diff, $m2);
    }

    public function testComparison()
    {
        $euro1 = new Money(1, new Currency('EUR'));
        $euro2 = new Money(2, new Currency('EUR'));
        $usd = new Money(1, new Currency('USD'));

        $this->assertTrue($euro2->greaterThan($euro1));
        $this->assertFalse($euro1->greaterThan($euro2));
        $this->assertTrue($euro1->lessThan($euro2));
        $this->assertFalse($euro2->lessThan($euro1));

        $this->assertEquals(-1, $euro1->compare($euro2));
        $this->assertEquals(1, $euro2->compare($euro1));
        $this->assertEquals(0, $euro1->compare($euro1));
    }
}