diff --git a/modules/oe_whitelabel_agenda/tests/src/Kernel/AgendaRenderTest.php b/modules/oe_whitelabel_agenda/tests/src/Kernel/AgendaRenderTest.php
new file mode 100644
index 00000000..398d4136
--- /dev/null
+++ b/modules/oe_whitelabel_agenda/tests/src/Kernel/AgendaRenderTest.php
@@ -0,0 +1,419 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\oe_whitelabel_agenda\Kernel;
+
+use Drupal\node\Entity\Node;
+use Drupal\oe_agenda\Entity\Agenda;
+use Drupal\oe_agenda\Entity\AgendaInterface;
+use Drupal\oe_agenda\Entity\Day as AgendaDay;
+use Drupal\oe_agenda\Entity\Session as AgendaSession;
+use Drupal\oe_agenda\Entity\SessionInterface;
+use Drupal\oe_content_sub_entity_person\Entity\Person;
+use Drupal\Tests\oe_bootstrap_theme\PatternAssertion\IconPatternAssert;
+use Drupal\Tests\oe_bootstrap_theme\PatternAssertion\LinkPatternAssert;
+use Drupal\Tests\oe_whitelabel\Kernel\AbstractKernelTestBase;
+use Symfony\Component\DomCrawler\Crawler;
+
+/**
+ * Tests that the agenda renders with the correct markup.
+ */
+class AgendaRenderTest extends AbstractKernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $configSchemaCheckerExclusions = [
+    // Schema checker fails when trying to import the config.
+    // See: https://github.com/openeuropa/oe_content/issues/634
+    // @todo remove when fixed in oe_content.
+    'core.entity_view_display.oe_agenda_session.oe_default.default',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'composite_reference',
+    'datetime',
+    'entity_reference_revisions',
+    'field',
+    'filter',
+    'inline_entity_form',
+    'link',
+    'link_description',
+    'node',
+    'oe_content_entity',
+    'oe_content_sub_entity',
+    'oe_content_sub_entity_person',
+    'oe_agenda',
+    'oe_agenda_test',
+    'oe_whitelabel_agenda',
+    'oe_whitelabel_agenda_test',
+    'ui_patterns',
+    'system',
+    'text',
+    'twig_field_value',
+    'time_field',
+    'user',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    $this->installEntitySchema('node');
+    $this->installEntitySchema('oe_agenda');
+    $this->installEntitySchema('oe_agenda_day');
+    $this->installEntitySchema('oe_agenda_session');
+    $this->installEntitySchema('oe_person');
+    $this->installConfig([
+      'filter',
+      'node',
+      'oe_agenda',
+      'oe_agenda_test',
+      'oe_whitelabel_agenda',
+      'oe_content_sub_entity_person',
+    ]);
+
+    \Drupal::moduleHandler()->loadInclude('oe_whitelabel_agenda', 'install');
+    oe_whitelabel_agenda_install(FALSE);
+    \Drupal::moduleHandler()->loadInclude('oe_whitelabel_agenda_test', 'install');
+    oe_whitelabel_agenda_test_install(FALSE);
+  }
+
+  /**
+   * Tests that agenda is rendered with the correct markup.
+   */
+  public function testRendering(): void {
+    $render = \Drupal::entityTypeManager()
+      ->getViewBuilder('oe_agenda')
+      ->view($this->createAgenda());
+    $html = $this->renderRoot($render);
+    $crawler = new Crawler($html);
+
+    // Assert agenda wrapper.
+    $agenda = $crawler->filter('.oe-agenda.accordion');
+    $this->assertCount(1, $agenda);
+
+    // Assert number of agenda days.
+    $days = $agenda->children('.accordion-item');
+    $this->assertCount(2, $days);
+    // Assert all agenda days are collapsed.
+    $this->assertCount(2, $crawler->filter('.accordion-button.collapsed'));
+
+    // Assert Day 1 date is displayed in the correct format.
+    $wrapper = $crawler->filter('#heading-bcl-accordion-1 .accordion-button time');
+    $this->assertEquals('Thursday - 26 September', $wrapper->text());
+
+    // Assert Day 2 date is displayed in the correct format.
+    $wrapper = $crawler->filter('#heading-bcl-accordion-2 .accordion-button time');
+    $this->assertEquals('Friday - 27 September', $wrapper->text());
+
+    // Assert Day 2 title is displayed.
+    $wrapper = $days->eq(1)->filter('.accordion-body > h3');
+    $this->assertEquals('Day 2 Title', $wrapper->text());
+
+    // Assert number of sessions on Day 1.
+    $sessions = $days->eq(0)->filter('.accordion-body > div');
+    $this->assertCount(3, $sessions);
+
+    // Assert Session 1 layout.
+    $session_left_col_selector = '.row .col-xxl-2.col-xl-3.col-lg-3.mb-3.mb-lg-0';
+    $session_left_col = $sessions->eq(0)->filter($session_left_col_selector);
+    $this->assertCount(1, $session_left_col);
+    $session_right_col_selector = '.row .session-content.col-xxl-10.col-xl-9.col-lg-9';
+    $session_right_col = $sessions->eq(0)->filter($session_right_col_selector);
+    $this->assertCount(1, $session_right_col);
+
+    // Assert Day 1 Session 1 icon and time are displayed.
+    $this->assertSessionHours([
+      'from' => '9:00',
+      'to' => '10:30',
+    ], $session_left_col);
+
+    // Assert Day 1 Session 1 title is displayed.
+    $wrapper = $session_right_col->filter('h4.h5:first-child');
+    $this->assertEquals('Session 1 Title', $wrapper->text());
+
+    // Select Day 1 Session 1 section wrappers.
+    $session_sections = $session_right_col->children('div.mb-4-5');
+
+    // Assert Day 1 Session 1 intro is displayed.
+    $this->assertEquals('Session 1 introduction.', $session_sections->eq(0)->text());
+
+    // Assert Day 1 Session 1 moderators are displayed.
+    $this->assertEquals('Moderators', $session_sections->eq(1)->filter('h5.mb-4')->text());
+    $this->assertEquals('Phasellus Viverra', $session_sections->eq(1)->filter('div.mb-2 a')->text());
+    $this->assertEquals('Sed Hendrerit', $session_sections->eq(1)->filter('div:last-child a')->text());
+
+    // Assert Day 1 Session 1 speakers are displayed.
+    $this->assertEquals('Speakers', $session_sections->eq(2)->filter('h5.mb-4')->text());
+    $this->assertEquals('Pellentesque Habitant', $session_sections->eq(2)->filter('div.mb-3 a')->text());
+    $this->assertEquals('Vestibulum Curabitur', $session_sections->eq(2)->filter('div:last-child a')->text());
+
+    // Assert Day 1 Session 1 venue and online link are displayed.
+    $description_list = $session_sections->eq(3)->filter('.bcl-description-list');
+    $link_wrappers = $description_list->filter('dl.mb-3.row');
+    $this->assertEquals('Venue:', $link_wrappers->eq(0)->filter('.col-md-3 dt')->text());
+    $venue_details = $link_wrappers->eq(0)->filter('.col dd div');
+    $link_assert = new LinkPatternAssert();
+    $link_assert->assertPattern([
+      'label' => 'Venue link text',
+      'path' => '/node/1',
+    ], $venue_details->children('a')->outerHtml());
+    $this->assertEquals('Venue description', $venue_details->children('p')->text());
+    $this->assertEquals('Online link:', $link_wrappers->eq(1)->filter('.col-md-3 dt')->text());
+    $online_link_details = $link_wrappers->eq(1)->filter('.col dd div');
+    $online_link = $online_link_details->children('a');
+    $link_assert->assertPattern([
+      'label' => 'Online link text',
+      'path' => 'https://example.com',
+      'settings' => [
+        'icon_position' => 'after',
+      ],
+      'attributes' => [
+        'target' => '_blank',
+      ],
+    ], $online_link->outerHtml());
+    // Can't use LinkPatternAssert for the icon, as it hard-codes the icon size.
+    $icon_assert = new IconPatternAssert();
+    $icon_assert->assertPattern([
+      'name' => 'box-arrow-up-right',
+      'size' => 'xs',
+    ], $online_link->children('svg')->outerHtml());
+    $this->assertEquals('Online link description', $online_link_details->children('p')->text());
+
+    // Assert Day 1 Session 1 details section is displayed.
+    $this->assertEquals('Session 1 details.', $session_right_col->children('.session-details')->text());
+
+    // Assert Day 1 Session 2 (Break) layout.
+    $session_2_left_col = $sessions->eq(1)->filter($session_left_col_selector);
+    $this->assertCount(1, $session_2_left_col);
+    $session_2_right_col = $sessions->eq(1)->filter($session_right_col_selector);
+    $this->assertCount(1, $session_2_right_col);
+
+    // Assert Day 1 Session 2 (Break) icon and time are displayed.
+    $this->assertSessionHours([
+      'session_type' => 'oe_break',
+      'from' => '10:30',
+      'to' => '11:00',
+    ], $session_2_left_col);
+
+    // Assert Day 1 Session 2 (Break) title is displayed.
+    $wrapper = $session_2_right_col->filter('h4.h5.text-muted:first-child');
+    $this->assertEquals('Break', $wrapper->text());
+
+    // Assert Day 1 Session 2 (Break) details section is displayed.
+    $this->assertEquals('Session 2 (Break) details.', $session_2_right_col->children('.session-details')->text());
+
+    // Assert Day 2 Session 2 (Break) custom title is displayed.
+    $day_2_sessions = $days->eq(1)->filter('.accordion-body > div');
+    $day_2_session_2_right_col = $day_2_sessions->eq(1)->filter($session_right_col_selector);
+    $wrapper = $day_2_session_2_right_col->filter('h4.h5.text-muted:first-child');
+    $this->assertEquals('Break Custom Title', $wrapper->text());
+  }
+
+  /**
+   * Asserts the session hours.
+   *
+   * @param array $expected
+   *   The expected settings.
+   * @param \Symfony\Component\DomCrawler\Crawler $crawler
+   *   The crawler.
+   */
+  protected function assertSessionHours(array $expected, Crawler $crawler): void {
+    $session_type = $expected['session_type'] ?? 'oe_default';
+    $from = $expected['from'] ?? '';
+    $to = $expected['to'] ?? '';
+
+    $icon_assert = new IconPatternAssert();
+    $icon = $crawler->children('svg');
+    $this->assertCount(1, $icon);
+    $icon_assert->assertPattern([
+      'name' => 'clock',
+      'size' => 'xs',
+      'attributes' => [
+        'class' => 'mb-1 me-2 bi icon--xs',
+      ],
+    ], $icon->outerHtml());
+    $time_wrapper_selector = $session_type === 'oe_break' ? 'span.text-muted' : 'span';
+    $this->assertEquals("{$from} - {$to}", $crawler->children($time_wrapper_selector)->text());
+  }
+
+  /**
+   * Creates an agenda using data for testing.
+   *
+   * @return \Drupal\oe_agenda\Entity\AgendaInterface
+   *   The created test agenda.
+   */
+  protected function createAgenda(): AgendaInterface {
+    $days = [
+      [
+        'date' => '2024-09-26',
+        'sessions' => [
+          [
+            'hours' => [
+              'from' => 32400,
+              'to' => 37800,
+            ],
+            'name' => 'Session 1 Title',
+            'intro' => 'Session 1 introduction.',
+            'moderators' => $this->createPersons([
+              'Phasellus Viverra',
+              'Sed Hendrerit',
+            ]),
+            'speakers' => $this->createPersons([
+              'Pellentesque Habitant',
+              'Vestibulum Curabitur',
+            ]),
+            'venue' => [
+              'uri' => 'entity:node/1',
+              'title' => 'Venue link text',
+              'description' => 'Venue description',
+            ],
+            'online_link' => [
+              'uri' => 'https://example.com',
+              'title' => 'Online link text',
+              'description' => 'Online link description',
+            ],
+            'details' => 'Session 1 details.',
+          ],
+          [
+            'type' => 'oe_break',
+            'hours' => [
+              'from' => 37800,
+              'to' => 39600,
+            ],
+            'details' => 'Session 2 (Break) details.',
+          ],
+          [
+            'hours' => [
+              'from' => 39600,
+              'to' => 43200,
+            ],
+          ],
+        ],
+      ],
+      [
+        'date' => '2024-09-27',
+        'title' => 'Day 2 Title',
+        'sessions' => [
+          [
+            'hours' => [
+              'from' => 30600,
+              'to' => 34200,
+            ],
+          ],
+          [
+            'type' => 'oe_break',
+            'name' => 'Break Custom Title',
+            'hours' => [
+              'from' => 34200,
+              'to' => 35100,
+            ],
+          ],
+        ],
+      ],
+    ];
+
+    $agenda_days = [];
+    foreach ($days as $day) {
+      $agenda_sessions = [];
+      foreach ($day['sessions'] as $session_data) {
+        $agenda_sessions[] = $this->createAgendaSession($session_data);
+      }
+
+      $agenda_day = AgendaDay::create([
+        'type' => 'oe_default',
+        'oe_day_date' => $day['date'],
+        'oe_day_sessions' => $agenda_sessions,
+      ]);
+      if (!empty($day['title'])) {
+        $agenda_day->set('title', $day['title']);
+      }
+      $agenda_day->save();
+      $agenda_days[] = $agenda_day;
+    }
+
+    $agenda = Agenda::create([
+      'type' => 'oe_default',
+      'oe_agenda_days' => $agenda_days,
+    ]);
+    $agenda->save();
+
+    return $agenda;
+  }
+
+  /**
+   * Creates an agenda session using data for testing.
+   *
+   * @return \Drupal\oe_agenda\Entity\SessionInterface
+   *   The created test agenda session.
+   */
+  protected function createAgendaSession(array $session_data): SessionInterface {
+    $session_type = $session_data['type'] ?? 'oe_default';
+    $from = $session_data['hours']['from'] ?? 0;
+    $to = $session_data['hours']['to'] ?? 3600;
+    $session = AgendaSession::create([
+      'type' => $session_type,
+      'oe_session_hours' => [
+        'from' => $from,
+        'to' => $to,
+      ],
+    ]);
+    if (!empty($session_data['name'])) {
+      $session->set('name', $session_data['name']);
+    }
+    if (!empty($session_data['intro'])) {
+      $session->set('oe_session_intro', $session_data['intro']);
+    }
+    if (!empty($session_data['moderators'])) {
+      $session->set('oe_session_moderators', $session_data['moderators']);
+    }
+    if (!empty($session_data['speakers'])) {
+      $session->set('oe_session_speakers', $session_data['speakers']);
+    }
+    if (!empty($session_data['venue'])) {
+      $session->set('oe_session_venue', $session_data['venue']);
+    }
+    if (!empty($session_data['online_link'])) {
+      $session->set('oe_session_online_link', $session_data['online_link']);
+    }
+    if (!empty($session_data['details'])) {
+      $session->set('oe_session_details', $session_data['details']);
+    }
+    $session->save();
+
+    return $session;
+  }
+
+  /**
+   * Creates nodes and referencing person subentities from a list of names.
+   *
+   * @param string[] $names
+   *   An array of names to be used as names of the persons.
+   *
+   * @return \Drupal\oe_content_sub_entity_person\Entity\PersonInterface[]
+   *   An array of person subentities to be referenced by certain agenda fields.
+   */
+  protected function createPersons(array $names): array {
+    $persons = [];
+    foreach ($names as $name) {
+      $node = Node::create([
+        'type' => 'test_person_bundle',
+        'title' => $name,
+      ]);
+      $persons[] = Person::create([
+        'type' => 'test_person_type',
+        'oe_test_person_reference' => $node,
+      ]);
+    }
+
+    return $persons;
+  }
+
+}