tdd session phpunconference2013

StringCalculatorTest.php

<?php
class StringCalculator
{
    public function add($numbers)
    {
        $separators = array(',', "\n");
        $matches = null;
        preg_match_all("~^\[(.)\]*~", $numbers, $matches);

        if(isset($matches[1][0]) && $matches[1][0] != null) {

            $separators[] = $matches[1][0];
            $numbers = substr($numbers, strlen($matches[0][0]) , strlen($numbers) - strlen($matches[0][0]));
        }

        foreach ($separators as $separator) {
            if(strstr($numbers, $separator)) {
                break;
            }
        }

        $numbers = explode($separator, $numbers);

        return array_sum($numbers);
    }
}

class StringCalculatorTest extends PHPUnit_Framework_TestCase
{
    public function testAddEmptyString()
    {
        $stringCalculator = new StringCalculator();

        $result = $stringCalculator->add("");

        $this->assertSame(0, $result);
    }

    public function testAddOneNumber()
    {
        $stringCalculator = new StringCalculator();

        $result = $stringCalculator->add("7");

        $this->assertSame(7, $result);
    }

    public function testAddTwoNumbersCommaSeparated()
    {
        $stringCalculator = new StringCalculator();

        $result = $stringCalculator->add("3,8");

        $this->assertSame(11, $result);
    }

    public function testAddThreeNumbersCommaSeparated()
    {
        $stringCalculator = new StringCalculator();

        $result = $stringCalculator->add("3,8,7");

        $this->assertSame(18, $result);
    }

    public function testAddTwoNumbersNewlineSeparated()
    {
        $stringCalculator = new StringCalculator();

        $result = $stringCalculator->add("3\n8");

        $this->assertSame(11, $result);
    }

    public function testAddThreeNumbersConfigurableDelimiterSeparated()
    {
        $stringCalculator = new StringCalculator();

        $result = $stringCalculator->add("[q]3q8q7");

        $this->assertSame(18, $result);
    }
}