assertTranslations example

// Create a destination.     $this->createDestination(['translations' => TRUE]);

    // Create some pre-existing entities.     $this->storage->create(['id' => 1, 'langcode' => 'en'])->save();
    $this->storage->create(['id' => 2, 'langcode' => 'fr'])->save();
    $translated = $this->storage->create(['id' => 3, 'langcode' => 'en']);
    $translated->save();
    $translated->addTranslation('fr')->save();

    // Pre-assert that things are as expected.     $this->assertTranslations(1, 'en');
    $this->assertTranslations(2, 'fr');
    $this->assertTranslations(3, 'en', ['fr']);
    $this->assertNull($this->storage->load(4));

    $destination_rows = [
      // Existing default translation.       ['id' => 1, 'langcode' => 'en', 'action' => MigrateIdMapInterface::ROLLBACK_PRESERVE],
      // New translation.       ['id' => 2, 'langcode' => 'en', 'action' => MigrateIdMapInterface::ROLLBACK_DELETE],
      // Existing non-default translation.       ['id' => 3, 'langcode' => 'fr', 'action' => MigrateIdMapInterface::ROLLBACK_PRESERVE],
      

$expected = [
      $values[0]['en'],
      $values[0]['en'],
      $values[0]['en'],
      $values[1]['en'],
      $values[1]['en'],
      $values[1]['en'],
      $values[2]['en'],
      $values[2]['en'],
      $values[2]['en'],
    ];
    $this->assertTranslations($display, '***LANGUAGE_language_content***', $expected, 'The current language renderer behaves as expected.');

    $expected = [
      $values[0]['en'],
      $values[0]['en'],
      $values[0]['en'],
      $values[1]['l0'],
      $values[1]['l0'],
      $values[1]['l0'],
      $values[2]['l1'],
      $values[2]['l1'],
      $values[2]['l1'],
    ];