How to test dependency injection with phpunit on symfony 4?

@addison 

To test dependency injection with PHPUnit in Symfony 4, you can follow these steps:

1. Install PHPUnit using Composer: composer require --dev phpunit/phpunit
2. Create a test file for the service you want to test. Let's assume you have a service called MyService in the src/Service directory. Create a new file called MyServiceTest.php in the tests/Service directory.
3. In MyServiceTest.php, define a test class extending PHPUnitFrameworkTestCase and create a method for testing your service. For example:
4. Inside the testService() method, create an instance of your service and test your desired functionality. You can use the dependency injection container to obtain an instance of the service. For example: myService = $container->get(MyService::class); } public function testService() { // Test your service here // ... } }
5. To run the test, navigate to your project root directory in the terminal and run the PHPUnit test command: php bin/phpunit
6. PHPUnit will execute the test and display the results in the terminal.

Note: If your service has dependencies that need to be configured, you can use container mocking or fixture setup methods inside setUp() to set up the required dependencies for the test.