dupspec.php

<?php

class BaseAdder
{
    public function add($a, $b)
    {
        return $a + $b;
    }
}

class BaseAdderSpec extends \PhpSpec\ObjectBehavior
{
    function it_adds()
    {
        $this->add(1, 2)->shouldReturn(3);
    }
}

class LogAdder extends BaseAdder
{
    protected $logger;

    public function __construct($logger)
    {
        $this->logger = $logger;
    }

    public function add($a, $b)
    {
        $this->logger->log("adding $a and $b");

        parent::add($a + $b);
    }
}

class LogAddedSpec extends \PhpSpec\ObjectBehavior
{
    function it_is_a_added()
    {
        $this->shouldBeAnInstanceOf('BaseAdded');
    }

    function it_logs()
    {
        $this->logger->log("adding 1 and 2")->shouldBeCalled();

        $this->add(1, 2);
    }

    /*
     * This test appears in BaseAdderSpec too but if it is left out of here
     * there's no proof that the actually adding functionality works.
     *
     * Having it in 2 places also means that we have to remember to update
     * here if the base class add() functionality is changed otherwise tests
     * will still pass with a broken codebase.
     */
    function it_adds()
    {
        $this->add(1, 2)->shouldReturn(3);
    }
}