How to extend PHP functions using PHPSpec?

How to use PHPSpec to extend PHP functions: introduce the PHPSpec library. Write the specification class and specify the constructor parameters in the constructor using beConstructedWith().

How to use PHPSpec to extend PHP functions

PHPSpec is a behavior-driven development (BDD) framework for writing PHP applications specifications. It simplifies the testing process by allowing you to specify expected behavior using a concise and readable syntax.

To extend PHP functions, you can use the beConstructedWith() method in PHPSpec. This method allows you to specify the parameters that the constructor should accept.

Usage:

1. Introduce PHPSpec library:

require 'path/to/phpspec/vendor/autoload.php';

2. Write standard class:

use PHPSpec2\ObjectBehavior;

class MyFunctionSpec extends ObjectBehavior
{
    function it_is_initializable()
    {
        $this->shouldHaveType('closure');
    }
}

3. Extension function:

class MyFunctionSpec extends ObjectBehavior
{
    function it_is_initializable()
    {
        $this->shouldHaveType('closure');
    }

    function it_accepts_array_argument()
    {
        $this->beConstructedWith([1, 2, 3]);
        $this->shouldHaveType('closure');
    }
}

Practical case:

Suppose we have a add() function that accepts parameters. We can use PHPSpec to specify the behavior of the add() function:

add() function:

function add(array $numbers)
{
    return array_sum($numbers);
}

PHPSpec specification:

use PHPSpec2\ObjectBehavior;

class AddFunctionSpec extends ObjectBehavior
{
    function it_is_initializable()
    {
        $this->shouldHaveType('closure');
    }

    function it_calculates_the_sum_of_numbers()
    {
        $this->beConstructedWith([1, 2, 3]);
        $this->invoke()->shouldEqual(6);
    }
}

The specification will assert that the add() function is instantiable and that it returns 6 when taking [1, 2, 3] as an argument.

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