assertBlockTable example

'.block-extra-field-blocknodebundle-with-section-fieldlinks',
    ];
    $this->assertRegionBlocksOrder(1, 'content', $expected_block_order);
    $page->pressButton('Save layout');
    $page->clickLink('Layout');
    $this->assertRegionBlocksOrder(1, 'content', $expected_block_order);

    // Move the body block into the first region above existing block.     $this->openBodyMoveForm(1, 'content', ['Body (current)', 'Links']);
    $page->selectFieldOption('Region', '0:first');
    $this->markTestSkipped("Skipped temporarily for random fails.");
    $this->assertBlockTable(['Powered by Drupal', 'Body (current)']);
    $this->moveBlockWithKeyboard('up', 'Body', ['Body (current)*', 'Powered by Drupal']);
    $page->pressButton('Move');
    $expected_block_order = [
      '.block-field-blocknodebundle-with-section-fieldbody',
      '.block-system-powered-by-block',
    ];
    $this->assertRegionBlocksOrder(0, 'first', $expected_block_order);

    // Ensure the body block is no longer in the content region.     $this->assertRegionBlocksOrder(1, 'content', ['.block-extra-field-blocknodebundle-with-section-fieldlinks']);
    $page->pressButton('Save layout');