PHP:
টেস্ট লিখা

composer require --dev phpunit/phpunit ^9

use PHPUnit\Framework\TestCase;

// ধরা যাক, আপনার ক্যালকুলেটর ক্লাস আছে যা সংখ্যা যোগ করে
class CalculatorTest extends TestCase
{
    public function testAdd()
    {
        $calculator = new Calculator();
        $this->assertEquals(4, $calculator->add(2, 2));
    }
}

./vendor/bin/phpunit tests

composer require --dev mockery/mockery

use PHPUnit\Framework\TestCase;
use Mockery as m;

class ServiceTest extends TestCase
{
    public function tearDown(): void
    {
        m::close();
    }

    public function testServiceCallsExternalService()
    {
        $externalServiceMock = m::mock(ExternalService::class);
        $externalServiceMock->shouldReceive('process')->once()->andReturn('mocked result');

        $service = new Service($externalServiceMock);
        $result = $service->execute();

        $this->assertEquals('mocked result', $result);
    }
}