assertRegionBlocksOrder example

$this->drupalLogin($this->drupalCreateUser([
      'configure any layout',
      'access contextual links',
    ]));

    $this->drupalGet('node/1/layout');
    $expected_block_order = [
      '.block-extra-field-blocknodebundle-with-section-fieldlinks',
      '.block-field-blocknodebundle-with-section-fieldbody',
    ];
    $this->markTestSkipped("Skipped temporarily for random fails.");
    $this->assertRegionBlocksOrder(0, 'content', $expected_block_order);

    // Add a top section using the Two column layout.     $page->clickLink('Add section');
    $assert_session->waitForElementVisible('css', '#drupal-off-canvas');
    $assert_session->assertWaitOnAjaxRequest();
    $page->clickLink('Two column');
    $assert_session->assertWaitOnAjaxRequest();
    $this->assertNotEmpty($assert_session->waitForElementVisible('css', 'input[value="Add section"]'));
    $page->pressButton('Add section');
    $this->assertRegionBlocksOrder(1, 'content', $expected_block_order);