How did you implement testing in your project?

In my PHP projects, testing was usually implemented using PHPUnit — the standard framework for unit testing. I wrote tests for key classes and methods to verify the correctness of business logic and error handling.

Example of a simple test:

use PHPUnit\Framework\TestCase;

class CalculatorTest extends TestCase
{
    public function testAdd()
    {
        $calc = new Calculator();
        $this->assertEquals(4, $calc->add(2, 2));
    }
}

I also used mock objects to isolate dependencies, testing components independently. For integration tests, I used a test database or in-memory SQLite to verify database interactions.

To automate, I ran tests through CI/CD, which allowed for quick detection of regressions when code changes.