--- /dev/null
+<?php
+
+namespace Drupal\Tests\devel\Functional;
+
+use Behat\Mink\Element\NodeElement;
+use Drupal\Core\Url;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests element info pages and links.
+ *
+ * @group devel
+ */
+class DevelElementInfoTest extends BrowserTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['devel', 'block'];
+
+ /**
+ * The user for the test.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $develUser;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->drupalPlaceBlock('system_menu_block:devel');
+ $this->drupalPlaceBlock('page_title_block');
+
+ $this->develUser = $this->drupalCreateUser(['access devel information']);
+ $this->drupalLogin($this->develUser);
+ }
+
+ /**
+ * Tests element info menu link.
+ */
+ public function testElementInfoMenuLink() {
+ $this->drupalPlaceBlock('system_menu_block:devel');
+ // Ensures that the element info link is present on the devel menu and that
+ // it points to the correct page.
+ $this->drupalGet('');
+ $this->clickLink('Element Info');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->addressEquals('/devel/elements');
+ $this->assertSession()->pageTextContains('Element Info');
+ }
+
+ /**
+ * Tests element list page.
+ */
+ public function testElementList() {
+ $this->drupalGet('/devel/elements');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextContains('Element Info');
+
+ $page = $this->getSession()->getPage();
+
+ // Ensures that the element list table is found.
+ $table = $page->find('css', 'table.devel-element-list');
+ $this->assertNotNull($table);
+
+ // Ensures that the expected table headers are found.
+ $headers = $table->findAll('css', 'thead th');
+ $this->assertEquals(4, count($headers));
+
+ $expected_headers = ['Name', 'Provider', 'Class', 'Operations'];
+ $actual_headers = array_map(function (NodeElement $element) {
+ return $element->getText();
+ }, $headers);
+ $this->assertSame($expected_headers, $actual_headers);
+
+ // Tests the presence of some (arbitrarily chosen) elements in the table.
+ $expected_elements = [
+ 'button' => [
+ 'class' => 'Drupal\Core\Render\Element\Button',
+ 'provider' => 'core',
+ ],
+ 'form' => [
+ 'class' => 'Drupal\Core\Render\Element\Form',
+ 'provider' => 'core',
+ ],
+ 'html' => [
+ 'class' => 'Drupal\Core\Render\Element\Html',
+ 'provider' => 'core',
+ ],
+ ];
+
+ foreach ($expected_elements as $element_name => $element) {
+ $row = $table->find('css', sprintf('tbody tr:contains("%s")', $element_name));
+ $this->assertNotNull($row);
+
+ /** @var $cells \Behat\Mink\Element\NodeElement[] */
+ $cells = $row->findAll('css', 'td');
+ $this->assertEquals(4, count($cells));
+
+ $cell = $cells[0];
+ $this->assertEquals($element_name, $cell->getText());
+ $this->assertTrue($cell->hasClass('table-filter-text-source'));
+
+ $cell = $cells[1];
+ $this->assertEquals($element['provider'], $cell->getText());
+ $this->assertTrue($cell->hasClass('table-filter-text-source'));
+
+ $cell = $cells[2];
+ $this->assertEquals($element['class'], $cell->getText());
+ $this->assertTrue($cell->hasClass('table-filter-text-source'));
+
+ $cell = $cells[3];
+ $actual_href = $cell->findLink('Devel')->getAttribute('href');
+ $expected_href = Url::fromRoute('devel.elements_page.detail', ['element_name' => $element_name])->toString();
+ $this->assertEquals($expected_href, $actual_href);
+ }
+
+ // Ensures that the page is accessible only to the users with the adequate
+ // permissions.
+ $this->drupalLogout();
+ $this->drupalGet('devel/elements');
+ $this->assertSession()->statusCodeEquals(403);
+ }
+
+ /**
+ * Tests element detail page.
+ */
+ public function testElementDetail() {
+ $element_name = 'button';
+
+ // Ensures that the page works as expected.
+ $this->drupalGet("/devel/elements/$element_name");
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextContains("Element $element_name");
+
+ // Ensures that the page returns a 404 error if the requested element is
+ // not defined.
+ $this->drupalGet('/devel/elements/not_exists');
+ $this->assertSession()->statusCodeEquals(404);
+
+ // Ensures that the page is accessible ony to users with the adequate
+ // permissions.
+ $this->drupalLogout();
+ $this->drupalGet("/devel/elements/$element_name");
+ $this->assertSession()->statusCodeEquals(403);
+ }
+
+}