--- /dev/null
+<?php
+
+namespace Drupal\Tests\devel\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests layout info pages and links.
+ *
+ * @group devel
+ */
+class DevelLayoutInfoTest extends BrowserTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['devel', 'block', 'layout_discovery'];
+
+ /**
+ * The user for the test.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $develUser;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ // TODO find a cleaner way to skip layout info tests when running tests on
+ // Drupal branch < 8.3.x.
+ if (version_compare(\Drupal::VERSION, '8.3', '<')) {
+ $this->markTestSkipped('Devel Layout Info Tests only available on version 8.3.x+.');
+ }
+
+ parent::setUp();
+
+ $this->drupalPlaceBlock('page_title_block');
+
+ $this->develUser = $this->drupalCreateUser(['access devel information']);
+ $this->drupalLogin($this->develUser);
+ }
+
+ /**
+ * Tests layout info menu link.
+ */
+ public function testLayoutsInfoMenuLink() {
+ $this->drupalPlaceBlock('system_menu_block:devel');
+ // Ensures that the layout info link is present on the devel menu and that
+ // it points to the correct page.
+ $this->drupalGet('');
+ $this->clickLink('Layouts Info');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->addressEquals('/devel/layouts');
+ $this->assertSession()->pageTextContains('Layout');
+ }
+
+ /**
+ * Tests layout info page.
+ */
+ public function testLayoutList() {
+ $this->drupalGet('/devel/layouts');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextContains('Layouts');
+
+ $page = $this->getSession()->getPage();
+
+ // Ensures that the layout table is found.
+ $table = $page->find('css', 'table.devel-layout-list');
+ $this->assertNotNull($table);
+
+ // Ensures that the expected table headers are found.
+ /** @var $headers \Behat\Mink\Element\NodeElement[] */
+ $headers = $table->findAll('css', 'thead th');
+ $this->assertEquals(6, count($headers));
+
+ $expected_headers = ['Icon', 'Label', 'Description', 'Category', 'Regions', 'Provider'];
+ $actual_headers = array_map(function ($element) {
+ return $element->getText();
+ }, $headers);
+ $this->assertSame($expected_headers, $actual_headers);
+
+ // Ensures that all the layouts are listed in the table.
+ $layout_manager = \Drupal::service('plugin.manager.core.layout');
+ $layouts = $layout_manager->getDefinitions();
+ $table_rows = $table->findAll('css', 'tbody tr');
+ $this->assertEquals(count($layouts), count($table_rows));
+
+ $index = 0;
+ foreach ($layouts as $layout) {
+ $cells = $table_rows[$index]->findAll('css', 'td');
+ $this->assertEquals(6, count($cells));
+
+ $cell_layout_icon = $cells[0];
+ if (empty($layout->getIconPath())) {
+ // @todo test that the icon path image is set correctly
+ }
+ else {
+ $this->assertNull($cell_layout_icon->getText());
+ }
+
+ $cell_layout_label = $cells[1];
+ $this->assertEquals($cell_layout_label->getText(), $layout->getLabel());
+
+ $cell_layout_description = $cells[2];
+ $this->assertEquals($cell_layout_description->getText(), $layout->getDescription());
+
+ $cell_layout_category = $cells[3];
+ $this->assertEquals($cell_layout_category->getText(), $layout->getCategory());
+
+ $cell_layout_regions = $cells[4];
+ $this->assertEquals($cell_layout_regions->getText(), implode(', ', $layout->getRegionLabels()));
+
+ $cell_layout_provider = $cells[5];
+ $this->assertEquals($cell_layout_provider->getText(), $layout->getProvider());
+
+ $index++;
+ }
+
+ // Ensures that the page is accessible only to the users with the adequate
+ // permissions.
+ $this->drupalLogout();
+ $this->drupalGet('devel/layouts');
+ $this->assertSession()->statusCodeEquals(403);
+ }
+
+ /**
+ * Tests the dependency with layout_discovery module.
+ */
+ public function testLayoutDiscoveryDependency() {
+ $this->container->get('module_installer')->uninstall(['layout_discovery']);
+ $this->drupalPlaceBlock('system_menu_block:devel');
+
+ // Ensures that the layout info link is not present on the devel menu.
+ $this->drupalGet('');
+ $this->assertSession()->linkNotExists('Layouts Info');
+
+ // Ensures that the layouts info page is not available.
+ $this->drupalGet('/devel/layouts');
+ $this->assertSession()->statusCodeEquals(404);
+
+ // Check a few other devel pages to verify devel module stil works.
+ $this->drupalGet('/devel/events');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->drupalGet('devel/routes');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->drupalGet('/devel/container/service');
+ $this->assertSession()->statusCodeEquals(200);
+ }
+
+}