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How do you use test doubles (mocks, stubs) in Symfony tests?

How do you use test doubles (mocks, stubs) in Symfony tests?

Using test doubles like mocks and stubs in Symfony tests is essential for isolating the unit of code being tested. Here’s how you can effectively use them with PHPUnit, which is the default testing framework for Symfony.

Step 1: Install PHPUnit

Ensure that PHPUnit is installed in your Symfony project. If it’s not already included, you can install it via Composer:

Example

composer require --dev phpunit/phpunit

Step 2: Create a Test Case

Create a new test case for the class you want to test. You can do this in the tests/ directory of your Symfony project.

Example

<?php
// tests/SomeServiceTest.php
namespace App\Tests;

use PHPUnit\Framework\TestCase;
use App\Service\SomeService;
use App\Repository\SomeRepository;

class SomeServiceTest extends TestCase
{
    private $service;
    private $repositoryMock;

    protected function setUp(): void
    {
        // Create a mock for SomeRepository
        $this->repositoryMock = $this->createMock(SomeRepository::class);

        // Inject the mock into the service
        $this->service = new SomeService($this->repositoryMock);
    }
}
?>

Step 3: Create Mocks and Stubs

You can create mocks and define their behavior for your tests:

Example

<?php
public function testGetData()
{
    // Configure the stub
    $this->repositoryMock->method('find')->willReturn(['data' => 'test']);

    // Call the method under test
    $result = $this->service->getData(1);

    // Assert the expected result
    $this->assertEquals(['data' => 'test'], $result);
}
?>

Step 4: Verify Method Calls

You can also verify that certain methods were called with specific parameters:

Example

<?php
public function testSaveData()
{
    $data = ['name' => 'example'];

    // Call the method under test
    $this->service->saveData($data);

    // Assert that the save method was called once with the expected data
    $this->repositoryMock->expects($this->once())
        ->method('save')
        ->with($this->equalTo($data));
}
?>

Step 5: Run Your Tests

Finally, run your tests using PHPUnit:

Example

./vendor/bin/phpunit tests

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