Start taxonomy term admin list page performance test

Closes #3476439

core/profiles/demo_umami/tests/src/FunctionalJavascript/VocabularyAdminPerformanceTest.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\demo_umami\FunctionalJavascript;
+
+use Drupal\block\Entity\Block;
+use Drupal\Core\Cache\Cache;
+use Drupal\FunctionalJavascriptTests\PerformanceTestBase;
+
+/**
+ * Tests demo_umami profile performance on vocabulary admin page.
+ *
+ * @group OpenTelemetry
+ * @requires extension apcu
+ */
+class VocabularyAdminPerformanceTest extends PerformanceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $profile = 'demo_umami';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+    $this->drupalLogin($this->drupalCreateUser([
+      'administer taxonomy',
+    ]));
+    // Remove the block showing tags terms on the footer, to be able to not
+    // load terms there by default on every page directly.
+    $block = $this->container->get('entity_type.manager')
+      ->getStorage('block')
+      ->load('umami_views_block__recipe_collections_block');
+    $this->assertTrue($block instanceof Block);
+    $block->delete();
+  }
+
+  /**
+   * Test vocabulary admin page performance with various cache permutations.
+   */
+  public function testPerformance(): void {
+    $this->testColdCache();
+    $this->testHotCache();
+    $this->testCoolCache();
+  }
+
+  /**
+   * Logs vocabulary admin page tracing data with a cold cache.
+   */
+  protected function testColdCache(): void {
+    // @todo Chromedriver doesn't collect tracing performance logs for the very
+    //   first request in a test, so warm it up.
+    //   https://www.drupal.org/project/drupal/issues/3379750
+    $this->drupalGet('user/login');
+    $this->rebuildAll();
+    $this->collectPerformanceData(function () {
+      $this->drupalGet('admin/structure/taxonomy/manage/tags/overview');
+    }, 'umamiVocabularyAdminPageColdCache');
+    $this->assertTermInVocabularyAdminPage();
+  }
+
+  /**
+   * Logs vocabulary admin page tracing data with a hot cache.
+   *
+   * Hot here means that all possible caches are warmed.
+   */
+  protected function testHotCache(): void {
+    // Request the page twice so that asset aggregates are definitely cached in
+    // the browser cache.
+    $this->drupalGet('admin/structure/taxonomy/manage/tags/overview');
+    $this->drupalGet('admin/structure/taxonomy/manage/tags/overview');
+
+    $performance_data = $this->collectPerformanceData(function () {
+      $this->drupalGet('admin/structure/taxonomy/manage/tags/overview');
+    }, 'umamiVocabularyAdminPageHotCache');
+
+    $expected = [
+      'queryCount' => 12,
+      'cacheGetCount' => 115,
+      'cacheSetCount' => 0,
+      'cacheDeleteCount' => 0,
+      'cacheTagChecksumCount' => 0,
+      'cacheTagIsValidCount' => 72,
+    ];
+    $this->assertTermInVocabularyAdminPage();
+    $this->assertMetrics($expected, $performance_data);
+  }
+
+  /**
+   * Logs vocabulary admin page tracing data with a cool cache.
+   *
+   * Cool here means that 'global' site caches are warm but anything
+   * specific to the route or path is cold.
+   */
+  protected function testCoolCache(): void {
+    // Visit a page without the tags terms loaded.
+    $this->drupalGet('user/login');
+    $this->clearCaches();
+    // Now visit it post cache rebuild to warm non-route-specific
+    // caches.
+    $this->drupalGet('user/login');
+    $this->collectPerformanceData(function () {
+      $this->drupalGet('admin/structure/taxonomy/manage/tags/overview');
+    }, 'umamiVocabularyAdminPageCoolCache');
+    $this->assertTermInVocabularyAdminPage();
+  }
+
+  /**
+   * Helper to find a known term in the list post page request.
+   *
+   * @param string $term_name
+   *   Term to find.
+   */
+  protected function assertTermInVocabularyAdminPage(string $term_name = 'Baked'): void {
+    $this->assertSession()->elementTextContains('xpath', '//table[@id="taxonomy"]', $term_name);
+  }
+
+  /**
+   * Clears all cache bins.
+   */
+  protected function clearCaches(): void {
+    foreach (Cache::getBins() as $bin) {
+      $bin->deleteAll();
+    }
+  }
+
+}

[catch]

This doesn't need to be added to the OpenTelemetry group, that determines what powers the dashboard at https://gander.tag1.io/