Backend Testing PHPUnit

When to use this skill

• Writing tests
• TDD development
• CI/CD pipelines
• Code quality

Workflow

• ] Write tests for critical logic
• ] Test edge cases
• ] Mock dependencies
• ] Run before commits
• ] Maintain tests

Instructions

Test Class

php
<?php

namespace Tests\Unit;

use CodeIgniter\Test\CIUnitTestCase;

class UserServiceTest extends CIUnitTestCase
{
    protected $service;

    protected function setUp(): void
    {
        parent::setUp();
        $this->service = new UserService();
    }

    public function testCreateUserWithValidData()
    {
        $data = ['name' => 'John', 'email' => 'john@example.com'];
        $user = $this->service->createUser($data);

        $this->assertInstanceOf(User::class, $user);
        $this->assertEquals('John', $user->name);
    }

    public function testCreateUserThrowsExceptionWithInvalidEmail()
    {
        $this->expectException(ValidationException::class);
        $this->service->createUser(['email' => 'invalid']);
    }
}

Run Tests

bash
vendor/bin/phpunit

Resources

• Test business logic
• Mock external dependencies
• Use descriptive test names