At what project size does it become necessary or beneficial to start implementing tests for PHP code, considering the potential time and effort required?

It is beneficial to start implementing tests for PHP code as soon as the project size and complexity increase to a point where manual testing becomes time-consuming and error-prone. Automated tests can help ensure code quality, catch bugs early, and facilitate future changes without breaking existing functionality. 

// Example of a simple PHPUnit test for a PHP function

require 'functions.php'; // Include the file containing the functions to be tested

use PHPUnit\Framework\TestCase;

class FunctionsTest extends TestCase {
    public function testAddition() {
        $result = add(2, 3);
        $this->assertEquals(5, $result);
    }

    public function testSubtraction() {
        $result = subtract(5, 3);
        $this->assertEquals(2, $result);
    }
}

Keywords

PHP testing code quality scalability automated testing

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