class ServiceProviderTest

class ServiceProviderTest extends KernelTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'file',
    'service_provider_test',
    'system',
  ];
  
  /**
   * Tests that services provided by module service providers get registered to the DIC.
   */
  public function testServiceProviderRegistration() {
    $definition = $this->container
      ->getDefinition('file.usage');
    $this->assertSame('Drupal\\service_provider_test\\TestFileUsage', $definition->getClass(), 'Class has been changed');
    $this->assertTrue(\Drupal::hasService('service_provider_test_class'), 'The service_provider_test_class service has been registered to the DIC');
  }
  
  /**
   * Tests that the DIC keeps up with module enable/disable in the same request.
   */
  public function testServiceProviderRegistrationDynamic() {
    // Uninstall the module and ensure the service provider's service is not registered.
    \Drupal::service('module_installer')->uninstall([
      'service_provider_test',
    ]);
    $this->assertFalse(\Drupal::hasService('service_provider_test_class'), 'The service_provider_test_class service does not exist in the DIC.');
    // Install the module and ensure the service provider's service is registered.
    \Drupal::service('module_installer')->install([
      'service_provider_test',
    ]);
    $this->assertTrue(\Drupal::hasService('service_provider_test_class'), 'The service_provider_test_class service exists in the DIC.');
  }

}