Magento 2 Unit Testing

🧪 Magento 2 Unit Testing – Test Your Code Like a Pro

Want to be confident your code won’t break things? Unit testing is your best buddy! Magento 2 supports PHPUnit for testing classes like models, helpers, and more — all in isolation. Let’s write clean code that we can trust. 👨‍💻

📦 Where to Place Unit Tests

Magento follows this directory structure:

app/code/Vendor/Module/
├── Test/
│   └── Unit/
│       └── Model/
│           └── MyModelTest.php

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🧰 Sample Unit Test Class

Here’s how to write a simple unit test using PHPUnit:

namespace Vendor\Module\Test\Unit\Model;

use PHPUnit\Framework\TestCase;
use Vendor\Module\Model\MyModel;

class MyModelTest extends TestCase
{
    public function testReturnsExpectedValue()
    {
        $model = new MyModel();
        $result = $model->getGreeting();
        $this->assertEquals('Hello Magento!', $result);
    }
}

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🚀 Run PHPUnit Tests

You can run unit tests using the command line:

vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist

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🧪 Mocking Dependencies

When your class depends on others, use mocks to isolate logic:

use PHPUnit\Framework\MockObject\MockObject;

public function testWithDependency()
{
    $mock = $this->createMock(\Magento\Framework\Api\SearchCriteriaInterface::class);
    
    // Test your class with the mock
}

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🧼 Best Practices for Unit Testing

  • Keep tests isolated — don’t rely on Magento services or database.
  • Use assertEquals(), assertTrue(), assertInstanceOf(), etc.
  • Focus on one method or behavior per test.

✅ Why Unit Testing Rocks

  • Catch bugs early ⛑️
  • Safe refactoring 🔄
  • Confidence in production 🚀

Now you’re testing like a pro! With Magento 2 unit tests, your modules are rock solid and ready for the real world. 💪