class BubbleableMetadataTest

class BubbleableMetadataTest extends UnitTestCase {
  
  /**
   * Tests feed asset merging.
   *
   * @covers ::mergeAttachments
   *
   * @dataProvider providerTestMergeAttachmentsFeedMerging
   */
  public function testMergeAttachmentsFeedMerging($a, $b, $expected) {
    $this->assertSame($expected, BubbleableMetadata::mergeAttachments($a, $b));
  }
  
  /**
   * Data provider for testMergeAttachmentsFeedMerging.
   *
   * @return array
   */
  public function providerTestMergeAttachmentsFeedMerging() {
    $feed_a = [
      'aggregator/rss',
      'Feed title',
    ];
    $feed_b = [
      'taxonomy/term/1/feed',
      'RSS - foo',
    ];
    $a = [
      'feed' => [
        $feed_a,
      ],
    ];
    $b = [
      'feed' => [
        $feed_b,
      ],
    ];
    $expected_a = [
      'feed' => [
        $feed_a,
        $feed_b,
      ],
    ];
    // Merging in the opposite direction yields the opposite library order.
    $expected_b = [
      'feed' => [
        $feed_b,
        $feed_a,
      ],
    ];
    return [
      [
        $a,
        $b,
        $expected_a,
      ],
      [
        $b,
        $a,
        $expected_b,
      ],
    ];
  }

}