# 🧩 CakePHP Components Unit Testing Reference

> **Hướng dẫn chi tiết cách viết test cho từng tầng thành phần trong CakePHP (Table, Entity, Controller, Service, Command, Component, Middleware, Mailer, Form, Behavior).**

---

## 1. Table Classes (`src/Model/Table/*Table.php`)
- **Base Class**: `Cake\TestSuite\TestCase`
- **Các điểm cần test**:
  - `validationDefault()`: Đầu vào hợp lệ, thiếu trường bắt buộc, sai format (email, regex, số âm).
  - `buildRules()`: Quy tắc toàn vẹn dữ liệu (`isUnique`, `existsIn`).
  - Custom Finders (`findPublished()`, `findAuth()`): Truy vấn trả về đúng bản ghi mong muốn.
  - Custom methods: Xử lý nghiệp vụ lưu dữ liệu.

```php
namespace App\Test\TestCase\Model\Table;

use App\Model\Table\ArticlesTable;
use Cake\TestSuite\TestCase;

class ArticlesTableTest extends TestCase
{
    protected ArticlesTable $Articles;
    protected array $fixtures = ['app.Articles'];

    protected function setUp(): void
    {
        parent::setUp();
        $this->Articles = $this->getTableLocator()->get('Articles');
    }

    public function testFindPublished(): void
    {
        $query = $this->Articles->find('published');
        $this->assertInstanceOf(\Cake\ORM\Query::class, $query);
        $result = $query->toArray();
        $this->assertNotEmpty($result);
        foreach ($result as $article) {
            $this->assertTrue($article->published);
        }
    }
}
```

---

## 2. Entity Classes (`src/Model/Entity/*.php`)
- **Base Class**: `Cake\TestSuite\TestCase`
- **Các điểm cần test**:
  - `_setPassword()` (Hashing logic).
  - Virtual Fields (`_getFullName()`).
  - `$_accessible` properties (Bảo vệ Mass Assignment).

```php
namespace App\Test\TestCase\Model\Entity;

use App\Model\Entity\User;
use Cake\TestSuite\TestCase;

class UserTest extends TestCase
{
    public function testPasswordIsHashed(): void
    {
        $user = new User(['password' => 'secret123']);
        $this->assertNotEquals('secret123', $user->password);
        $this->assertTrue((new \Authentication\PasswordHasher\DefaultPasswordHasher())->check('secret123', $user->password));
    }

    public function testVirtualFieldFullName(): void
    {
        $user = new User(['first_name' => 'John', 'last_name' => 'Doe']);
        $this->assertSame('John Doe', $user->full_name);
    }
}
```

---

## 3. Controller Classes (`src/Controller/*Controller.php`)
- **Base Class**: `Cake\TestSuite\TestCase` với `Cake\TestSuite\IntegrationTestTrait`
- **Các điểm cần test**:
  - HTTP Status: `200` OK, `302` Redirect, `403` Forbidden, `404` Not Found, `422` Unprocessable Entity.
  - Flash messages: `$this->assertFlashMessage()`.
  - Session & Auth: Giả lập đăng nhập qua `$this->session()`.
  - CSRF & Security Tokens: Bắt buộc dùng `$this->enableCsrfToken()` và `$this->enableSecurityToken()` khi test POST/PUT/DELETE.

```php
namespace App\Test\TestCase\Controller;

use Cake\TestSuite\IntegrationTestTrait;
use Cake\TestSuite\TestCase;

class ArticlesControllerTest extends TestCase
{
    use IntegrationTestTrait;
    protected array $fixtures = ['app.Articles', 'app.Users'];

    public function testAddWithoutAuthRedirectsToLogin(): void
    {
        $this->get('/articles/add');
        $this->assertRedirectContains('/login');
    }

    public function testAddSuccess(): void
    {
        $this->session(['Auth.User.id' => 1]);
        $this->enableCsrfToken();
        $this->enableSecurityToken();

        $this->post('/articles/add', [
            'title' => 'Sample Article',
            'body' => 'Body text',
            'published' => true,
        ]);

        $this->assertRedirect(['action' => 'index']);
        $this->assertFlashMessage('The article has been saved.');
    }
}
```

---

## 4. Service Classes (`src/Service/*.php`)
- **Base Class**: `Cake\TestSuite\TestCase`
- **Các điểm cần test**:
  - Các dependency được mock bằng PHPUnit Mock hoặc Mockery.
  - Kiểm thử toàn bộ các nhánh rẽ điều kiện (Success, Invalid Data, 3rd-Party Failure).

```php
namespace App\Test\TestCase\Service;

use App\Service\PaymentProcessingService;
use Cake\TestSuite\TestCase;

class PaymentProcessingServiceTest extends TestCase
{
    public function testChargeSuccess(): void
    {
        $clientMock = $this->createMock(\App\External\StripeClient::class);
        $clientMock->expects($this->once())
            ->method('createCharge')
            ->willReturn(['id' => 'ch_123', 'status' => 'succeeded']);

        $service = new PaymentProcessingService($clientMock);
        $result = $service->processOrder(100.0, 'tok_visa');

        $this->assertTrue($result->isSuccess());
    }
}
```

---

## 5. Console Command Classes (`src/Command/*Command.php`)
- **Base Class**: `Cake\TestSuite\TestCase` với `Cake\Console\TestSuite\ConsoleIntegrationTestTrait`
- **Các điểm cần test**:
  - `assertExitSuccess()` và `assertExitError()`.
  - `assertOutputContains()`.
  - Arguments và Options flags.

```php
namespace App\Test\TestCase\Command;

use Cake\Console\TestSuite\ConsoleIntegrationTestTrait;
use Cake\TestSuite\TestCase;

class SyncInventoryCommandTest extends TestCase
{
    use ConsoleIntegrationTestTrait;

    protected function setUp(): void
    {
        parent::setUp();
        $this->useCommandRunner();
    }

    public function testSyncAll(): void
    {
        $this->exec('sync_inventory --all');
        $this->assertExitSuccess();
        $this->assertOutputContains('Inventory sync completed.');
    }
}
```

---

## 6. Controller Component Classes (`src/Controller/Component/*.php`)
- Test logic tái sử dụng gắn vào Controller, dùng `ComponentRegistry`.

---

## 7. Middleware Classes (`src/Middleware/*.php`)
- Test PSR-15 Middleware với `Cake\Http\ServerRequest` và Response Handler.

---

## 8. Mailer Classes (`src/Mailer/*Mailer.php`)
- Sử dụng `Cake\TestSuite\EmailTrait`, kiểm tra email recipient, subject, và template body.

---

## 9. Form Classes (`src/Form/*Form.php`)
- Test standalone forms không gắn với ORM table (ContactForm, SearchFilterForm).
- Kiểm tra `validationDefault()` và `_execute()`.

---

## 10. Behavior Classes (`src/Model/Behavior/*.php`)
- Test ORM Behavior hooks (`beforeSave`, `beforeFind`, `afterSave`).