FlattenTest.php

<?php

namespace Drupal\Tests\migrate\Unit\process;

use Drupal\migrate\Plugin\migrate\process\Flatten;

/**
 * Tests the flatten plugin.
 *
 * @group migrate
 */
class FlattenTest extends MigrateProcessTestCase {
  
  /**
   * Test that various array flatten operations work properly.
   */
  public function testFlatten() {
    $plugin = new Flatten([], 'flatten', []);
    $flattened = $plugin->transform([
      1,
      2,
      [
        3,
        4,
        [
          5,
        ],
      ],
      [],
      [
        7,
        8,
      ],
    ], $this->migrateExecutable, $this->row, 'destination_property');
    $this->assertSame([
      1,
      2,
      3,
      4,
      5,
      7,
      8,
    ], $flattened);
  }

}