How use class interfaces when using phpspec?

@elisha_langworth 

When using phpspec, you can define class interfaces by creating a separate file for the interface and then implementing it in the class you want to test. Here's an example of how you can use class interfaces when using phpspec:

1. Create an interface file: Create a new file and define the interface. For example, let's create a file called CarInterface.php:

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<?php

interface CarInterface
{
    public function startEngine();
    public function stopEngine();
    public function accelerate();
    public function brake();
}

1. Implement the interface in the class you want to test: In your class that you want to test, implement the interface and implement its methods. For example, let's assume you have a class called Car in a file called Car.php:

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<?php

class Car implements CarInterface
{
    public function startEngine()
    {
        // implementation of startEngine method
    }
    
    public function stopEngine()
    {
        // implementation of stopEngine method
    }
    
    public function accelerate()
    {
        // implementation of accelerate method
    }
    
    public function brake()
    {
        // implementation of brake method
    }
}

1. Write phpspec tests for the class: Create a new phpspec test file for the Car class and write tests for its methods. For example, let's create a file called CarSpec.php:

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<?php

use PhpSpecObjectBehavior;

class CarSpec extends ObjectBehavior
{
    function it_implements_car_interface()
    {
        $this->shouldImplement('CarInterface');
    }
    
    // Write more tests for the methods of the Car class
    // ...
}

By using class interfaces, you can define a contract that must be followed by the classes implementing the interface. This allows you to decouple your code and write more reliable and maintainable tests with phpspec.