How to Test A Doctrine Repository

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How to Test A Doctrine Repository

Mocking a Doctrine Repository in Unit Tests

Unit testing Doctrine repositories is not recommended. Repositories are meant to be tested against a real database connection. However, in case you still need to do this, look at the following example.

Suppose the class you want to test looks like this:

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        // src/Salary/SalaryCalculator.php
namespace App\Salary;

use App\Entity\Employee;
use Doctrine\Persistence\ObjectManager;

class SalaryCalculator
{
    public function __construct(
        private ObjectManager $objectManager,
    ) {
    }

    public function calculateTotalSalary(int $id): int
    {
        $employeeRepository = $this->objectManager
            ->getRepository(Employee::class);
        $employee = $employeeRepository->find($id);

        return $employee->getSalary() + $employee->getBonus();
    }
}
    

Since the EntityManagerInterface gets injected into the class through the constructor, you can pass a mock object within a test:

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        // tests/Salary/SalaryCalculatorTest.php
namespace App\Tests\Salary;

use App\Entity\Employee;
use App\Salary\SalaryCalculator;
use Doctrine\Persistence\ObjectManager;
use Doctrine\Persistence\ObjectRepository;
use PHPUnit\Framework\TestCase;

class SalaryCalculatorTest extends TestCase
{
    public function testCalculateTotalSalary(): void
    {
        $employee = new Employee();
        $employee->setSalary(1000);
        $employee->setBonus(1100);

        // Now, mock the repository so it returns the mock of the employee
        $employeeRepository = $this->createMock(ObjectRepository::class);
        $employeeRepository->expects($this->any())
            ->method('find')
            ->willReturn($employee);

        // Last, mock the EntityManager to return the mock of the repository
        // (this is not needed if the class being tested injects the
        // repository it uses instead of the entire object manager)
        $objectManager = $this->createMock(ObjectManager::class);
        $objectManager->expects($this->any())
            ->method('getRepository')
            ->willReturn($employeeRepository);

        $salaryCalculator = new SalaryCalculator($objectManager);
        $this->assertEquals(2100, $salaryCalculator->calculateTotalSalary(1));
    }
}
    

In this example, you are building the mocks from the inside out, first creating the employee which gets returned by the Repository, which itself gets returned by the EntityManager. This way, no real class is involved in testing.

Functional Testing of A Doctrine Repository

In functional tests you'll make queries to the database using the actual Doctrine repositories, instead of mocking them. To do so, get the entity manager via the service container as follows:

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        // tests/Repository/ProductRepositoryTest.php
namespace App\Tests\Repository;

use App\Entity\Product;
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;

class ProductRepositoryTest extends KernelTestCase
{
    private \Doctrine\ORM\EntityManager $entityManager;

    protected function setUp(): void
    {
        $kernel = self::bootKernel();

        $this->entityManager = $kernel->getContainer()
            ->get('doctrine')
            ->getManager();
    }

    public function testSearchByName(): void
    {
        $product = $this->entityManager
            ->getRepository(Product::class)
            ->findOneBy(['name' => 'Priceless widget'])
        ;

        $this->assertSame(14.50, $product->getPrice());
    }

    protected function tearDown(): void
    {
        parent::tearDown();

        // doing this is recommended to avoid memory leaks
        $this->entityManager->close();
        $this->entityManager = null;
    }
}
    

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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