How use class interfaces when using PHPSpec

Question

When testing with PHPSpec how can I use class interfaces injected into my methods rather then the actual concrete class?

For example I have a Product class that injects a VariationInterface into a method:

/**
 * ...
 */
public function addVarient(VarientInterface $varient)
{
    return $this->varients->add($varient);
}

Although since PHPSpec has no IOC container to bind VarientInterface to Varient I cant really test my classes.

Is it not best practice to code to an interface and not a concrete class?

Answer 1

You can mock concrete classes and intefaces in PHPSpec.

Please verify this example:

<?php

//file spec/YourNameSpace/ProductSpec.php

namespace spec\YourNameSpace\Product;

use YourNameSpace\VarientInterface;
use PhpSpec\ObjectBehavior;

class ProductSpec extends ObjectBehavior
{
    function it_is_varients_container(VarientInterface $varient)
    {
        $this->addVarient($varient);

        $this->getVarients()->shouldBe([$varient]);
    }
}

You just pass VarientInterface as parameter to test method. This VarientInterface is mocked underneath by PhpSpec (really by Prophecy).

Please check offical phpspec documentaion about mocking http://www.phpspec.net/docs/introduction.html#prophet-objects