How can PHP developers ensure proper testing and debugging of code that involves interfaces and inheritance?

When testing and debugging PHP code that involves interfaces and inheritance, developers can ensure proper functionality by writing unit tests that cover all possible scenarios, including testing the implementation of interfaces and the inheritance hierarchy. Additionally, using debugging tools like Xdebug can help identify and resolve any issues that arise during testing. 

<?php

// Interface definition
interface Shape {
    public function calculateArea();
}

// Base class
class Rectangle implements Shape {
    protected $width;
    protected $height;

    public function __construct($width, $height) {
        $this->width = $width;
        $this->height = $height;
    }

    public function calculateArea() {
        return $this->width * $this->height;
    }
}

// Subclass extending Rectangle
class Square extends Rectangle {
    public function __construct($sideLength) {
        parent::__construct($sideLength, $sideLength);
    }
}

// Unit test
$rectangle = new Rectangle(5, 10);
assert($rectangle->calculateArea() == 50);

$square = new Square(5);
assert($square->calculateArea() == 25);

echo "All tests passed!";

Keywords

PHP interfaces inheritance testing debugging

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