class ConfigExportTest

class ConfigExportTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'config',
        'system',
        'block',
        'block_content',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * @var string
     *  A prefix string used in naming the test blocks.
     */
    protected string $blockNamePrefix = 'aaaaaa_config_export_test_block';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalLogin($this->drupalCreateUser([
            'administer blocks',
            'access block library',
            'administer block types',
            'administer block content',
        ]));
        // Create test blocks, so we know what the titles will be to check their order.
        foreach ([
            1,
            2,
            3,
            4,
        ] as $num) {
            $block_name = $this->blockNamePrefix . $num;
            $new_block = $this->createBlockContent($block_name);
            $this->drupalPlaceBlock('block_content:' . $new_block->uuid(), [
                'id' => $block_name,
                'label' => $this->randomMachineName(),
                'theme' => $this->defaultTheme,
                'region' => 'sidebar_first',
            ]);
        }
    }
    
    /**
     * Creates test blocks.
     *
     * @param $title
     *   Title of the block.
     *
     * @return \Drupal\block_content\Entity\BlockContent
     *
     * @throws \Drupal\Core\Entity\EntityStorageException
     */
    protected function createBlockContent($title) {
        $block_content = BlockContent::create([
            'info' => $title,
            'type' => 'basic',
        ]);
        $block_content->save();
        return $block_content;
    }
    
    /**
     * Tests Ajax form functionality on the config export page.
     */
    public function testAjaxOnExportPage() : void {
        $this->drupalLogin($this->drupalCreateUser([
            'export configuration',
            'administer blocks',
        ]));
        $page = $this->getSession()
            ->getPage();
        // Check that the export is empty on load.
        $this->drupalGet('admin/config/development/configuration/single/export');
        $this->assertTrue($this->assertSession()
            ->optionExists('edit-config-name', '- Select -')
            ->isSelected());
        $this->assertSession()
            ->fieldValueEquals('export', '');
        // Check that the export is filled when selecting a config name.
        $page->selectFieldOption('config_name', 'system.site');
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertSession()
            ->fieldValueNotEquals('export', '');
        // Check that the export is empty when selecting "- Select -" option in
        // the config name.
        $page->selectFieldOption('config_name', '- Select -');
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertSession()
            ->fieldValueEquals('export', '');
        // Check that the export is emptied again when selecting a config type.
        $page->selectFieldOption('config_type', 'Action');
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertSession()
            ->fieldValueEquals('export', '');
        // Check that the 'Configuration name' list is sorted alphabetically by ID,
        // which always begins with our prefix, and not the label, which is randomized.
        $page->selectFieldOption('config_type', 'Block');
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $options = $page->findField('config_name')
            ->findAll('css', 'option');
        foreach ([
            1,
            2,
            3,
            4,
        ] as $num) {
            $block_name = $this->blockNamePrefix . $num;
            $this->assertStringStartsWith($block_name, $options[$num]->getText());
            $this->assertEquals($block_name, $options[$num]->getValue());
        }
    }

}