diff --git a/core/drupalci.yml b/core/drupalci.yml
index cd92d8102d..6fe6808cb3 100644
--- a/core/drupalci.yml
+++ b/core/drupalci.yml
@@ -3,49 +3,15 @@
 # https://www.drupal.org/drupalorg/docs/drupal-ci/customizing-drupalci-testing
 _phpunit_testgroups_to_execute: &testgroups
   # Default: all of Drupal core's test suite runs.
-  testgroups: '--all'
+  testgroups: '--class "\Drupal\Tests\locale\Functional\LocaleUpdateTest"'
   # Alternative: run only the tests for one particular module.
   # testgroups: '--module ckeditor5'
 build:
   assessment:
     testing:
-      # Run code quality checks.
-      container_command.commit-checks:
-        commands:
-          - "core/scripts/dev/commit-code-check.sh --drupalci"
-        halt-on-fail: true
-      # run_tests task is executed several times in order of performance speeds.
-      # halt-on-fail can be set on the run_tests tasks in order to fail fast.
-      # suppress-deprecations is false in order to be alerted to usages of
-      # deprecated code.
-      run_tests.phpunit:
-        types: 'PHPUnit-Unit'
-        suppress-deprecations: false
-        halt-on-fail: false
-        <<: *testgroups
-      run_tests.kernel:
-        types: 'PHPUnit-Kernel'
-        suppress-deprecations: false
-        halt-on-fail: false
-        <<: *testgroups
-      run_tests.build:
-        # Limit concurrency due to disk space concerns.
-        concurrency: 15
-        types: 'PHPUnit-Build'
-        suppress-deprecations: false
-        halt-on-fail: false
-        <<: *testgroups
       run_tests.functional:
         types: 'PHPUnit-Functional'
         suppress-deprecations: false
         halt-on-fail: false
         <<: *testgroups
-      run_tests.javascript:
-        concurrency: 15
-        types: 'PHPUnit-FunctionalJavascript'
-        suppress-deprecations: false
-        halt-on-fail: false
-        <<: *testgroups
-      # Run nightwatch testing.
-      # @see https://www.drupal.org/project/drupal/issues/2869825
-      nightwatchjs: {}
+        repeat: 5000
diff --git a/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php b/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
index 0f2a78a8d5..db7b9946b3 100644
--- a/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
@@ -40,71 +40,6 @@ protected function setUp(): void {
     $this->addLanguage('de');
   }
 
-  /**
-   * Checks if local or remote translation sources are detected.
-   *
-   * The translation status process by default checks the status of the
-   * installed projects. For testing purpose a predefined set of modules with
-   * fixed file names and release versions is used. This custom project
-   * definition is applied using a hook_locale_translation_projects_alter
-   * implementation in the locale_test module.
-   *
-   * This test generates a set of local and remote translation files in their
-   * respective local and remote translation directory. The test checks whether
-   * the most recent files are selected in the different check scenarios: check
-   * for local files only, check for both local and remote files.
-   */
-  public function testUpdateCheckStatus() {
-    // Case when contributed modules are absent.
-    $this->drupalGet('admin/reports/translations');
-    $this->assertSession()->pageTextContains('Missing translations for one project');
-
-    $config = $this->config('locale.settings');
-    // Set a flag to let the locale_test module replace the project data with a
-    // set of test projects.
-    \Drupal::state()->set('locale.test_projects_alter', TRUE);
-
-    // Create local and remote translations files.
-    $this->setTranslationFiles();
-    $config->set('translation.default_filename', '%project-%version.%language._po')->save();
-
-    // Set the test conditions.
-    $edit = [
-      'use_source' => LOCALE_TRANSLATION_USE_SOURCE_LOCAL,
-    ];
-    $this->drupalGet('admin/config/regional/translate/settings');
-    $this->submitForm($edit, 'Save configuration');
-
-    // Get status of translation sources at local file system.
-    $this->drupalGet('admin/reports/translations/check');
-    $result = locale_translation_get_status();
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['contrib_module_one']['de']->type, 'Translation of contrib_module_one found');
-    $this->assertEquals($this->timestampOld, $result['contrib_module_one']['de']->timestamp, 'Translation timestamp found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['contrib_module_two']['de']->type, 'Translation of contrib_module_two found');
-    $this->assertEquals($this->timestampNew, $result['contrib_module_two']['de']->timestamp, 'Translation timestamp found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['locale_test']['de']->type, 'Translation of locale_test found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['custom_module_one']['de']->type, 'Translation of custom_module_one found');
-
-    // Set the test conditions.
-    $edit = [
-      'use_source' => LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL,
-    ];
-    $this->drupalGet('admin/config/regional/translate/settings');
-    $this->submitForm($edit, 'Save configuration');
-
-    // Get status of translation sources at both local and remote locations.
-    $this->drupalGet('admin/reports/translations/check');
-    $result = locale_translation_get_status();
-    $this->assertEquals(LOCALE_TRANSLATION_REMOTE, $result['contrib_module_one']['de']->type, 'Translation of contrib_module_one found');
-    $this->assertEquals($this->timestampNew, $result['contrib_module_one']['de']->timestamp, 'Translation timestamp found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['contrib_module_two']['de']->type, 'Translation of contrib_module_two found');
-    $this->assertEquals($this->timestampNew, $result['contrib_module_two']['de']->timestamp, 'Translation timestamp found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['contrib_module_three']['de']->type, 'Translation of contrib_module_three found');
-    $this->assertEquals($this->timestampOld, $result['contrib_module_three']['de']->timestamp, 'Translation timestamp found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['locale_test']['de']->type, 'Translation of locale_test found');
-    $this->assertEquals(LOCALE_TRANSLATION_LOCAL, $result['custom_module_one']['de']->type, 'Translation of custom_module_one found');
-  }
-
   /**
    * Tests translation import from remote sources.
    *
@@ -176,308 +111,4 @@ public function testUpdateImportSourceRemote() {
     // cSpell:enable
   }
 
-  /**
-   * Tests translation import from local sources.
-   *
-   * Test conditions:
-   *  - Source: local files only
-   *  - Import overwrite: all existing translations
-   */
-  public function testUpdateImportSourceLocal() {
-    $config = $this->config('locale.settings');
-
-    // Build the test environment.
-    $this->setTranslationFiles();
-    $this->setCurrentTranslations();
-    $config->set('translation.default_filename', '%project-%version.%language._po');
-
-    // Set the update conditions for this test.
-    $edit = [
-      'use_source' => LOCALE_TRANSLATION_USE_SOURCE_LOCAL,
-      'overwrite' => LOCALE_TRANSLATION_OVERWRITE_ALL,
-    ];
-    $this->drupalGet('admin/config/regional/translate/settings');
-    $this->submitForm($edit, 'Save configuration');
-
-    // Execute the translation update.
-    $this->drupalGet('admin/reports/translations/check');
-    $this->drupalGet('admin/reports/translations');
-    $this->submitForm([], 'Update translations');
-
-    // Check if the translation has been updated, using the status cache.
-    $status = locale_translation_get_status();
-    $this->assertEquals(LOCALE_TRANSLATION_CURRENT, $status['contrib_module_one']['de']->type, 'Translation of contrib_module_one found');
-    $this->assertEquals(LOCALE_TRANSLATION_CURRENT, $status['contrib_module_two']['de']->type, 'Translation of contrib_module_two found');
-    $this->assertEquals(LOCALE_TRANSLATION_CURRENT, $status['contrib_module_three']['de']->type, 'Translation of contrib_module_three found');
-
-    // Check the new translation status.
-    // The static cache needs to be flushed first to get the most recent data
-    // from the database. The function was called earlier during this test.
-    drupal_static_reset('locale_translation_get_file_history');
-    $history = locale_translation_get_file_history();
-    // Verify that the translation of contrib_module_one is imported.
-    $this->assertGreaterThanOrEqual($this->timestampMedium, $history['contrib_module_one']['de']->timestamp);
-    $this->assertEquals($this->timestampMedium, $history['contrib_module_one']['de']->last_checked, 'Translation of contrib_module_one is updated');
-    $this->assertEquals($this->timestampNew, $history['contrib_module_two']['de']->timestamp, 'Translation of contrib_module_two is imported');
-    // Verify that the translation of contrib_module_two is updated.
-    $this->assertGreaterThanOrEqual($this->timestampNow, $history['contrib_module_two']['de']->last_checked);
-    $this->assertEquals($this->timestampMedium, $history['contrib_module_three']['de']->timestamp, 'Translation of contrib_module_three is not imported');
-    $this->assertEquals($this->timestampMedium, $history['contrib_module_three']['de']->last_checked, 'Translation of contrib_module_three is not updated');
-
-    // Check whether existing translations have (not) been overwritten.
-    // cSpell:disable
-    $this->assertEquals('Januar_customized', t('January', [], ['langcode' => 'de']), 'Translation of January');
-    $this->assertEquals('Februar_2', t('February', [], ['langcode' => 'de']), 'Translation of February');
-    $this->assertEquals('Marz_2', t('March', [], ['langcode' => 'de']), 'Translation of March');
-    $this->assertEquals('April_2', t('April', [], ['langcode' => 'de']), 'Translation of April');
-    $this->assertEquals('Mai_customized', t('May', [], ['langcode' => 'de']), 'Translation of May');
-    $this->assertEquals('Juni', t('June', [], ['langcode' => 'de']), 'Translation of June');
-    $this->assertEquals('Montag', t('Monday', [], ['langcode' => 'de']), 'Translation of Monday');
-    // cSpell:enable
-  }
-
-  /**
-   * Tests translation import and only overwrite non-customized translations.
-   *
-   * Test conditions:
-   *  - Source: remote and local files
-   *  - Import overwrite: only overwrite non-customized translations
-   */
-  public function testUpdateImportModeNonCustomized() {
-    $config = $this->config('locale.settings');
-
-    // Build the test environment.
-    $this->setTranslationFiles();
-    $this->setCurrentTranslations();
-    $config->set('translation.default_filename', '%project-%version.%language._po');
-
-    // Set the test conditions.
-    $edit = [
-      'use_source' => LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL,
-      'overwrite' => LOCALE_TRANSLATION_OVERWRITE_NON_CUSTOMIZED,
-    ];
-    $this->drupalGet('admin/config/regional/translate/settings');
-    $this->submitForm($edit, 'Save configuration');
-
-    // Execute translation update.
-    $this->drupalGet('admin/reports/translations/check');
-    $this->drupalGet('admin/reports/translations');
-    $this->submitForm([], 'Update translations');
-
-    // Check whether existing translations have (not) been overwritten.
-    // cSpell:disable
-    $this->assertEquals('Januar_customized', t('January', [], ['langcode' => 'de']), 'Translation of January');
-    $this->assertEquals('Februar_customized', t('February', [], ['langcode' => 'de']), 'Translation of February');
-    $this->assertEquals('Marz_2', t('March', [], ['langcode' => 'de']), 'Translation of March');
-    $this->assertEquals('April_2', t('April', [], ['langcode' => 'de']), 'Translation of April');
-    $this->assertEquals('Mai_customized', t('May', [], ['langcode' => 'de']), 'Translation of May');
-    $this->assertEquals('Juni', t('June', [], ['langcode' => 'de']), 'Translation of June');
-    $this->assertEquals('Montag', t('Monday', [], ['langcode' => 'de']), 'Translation of Monday');
-    // cSpell:enable
-  }
-
-  /**
-   * Tests translation import and don't overwrite any translation.
-   *
-   * Test conditions:
-   *  - Source: remote and local files
-   *  - Import overwrite: don't overwrite any existing translation
-   */
-  public function testUpdateImportModeNone() {
-    $config = $this->config('locale.settings');
-
-    // Build the test environment.
-    $this->setTranslationFiles();
-    $this->setCurrentTranslations();
-    $config->set('translation.default_filename', '%project-%version.%language._po');
-
-    // Set the test conditions.
-    $edit = [
-      'use_source' => LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL,
-      'overwrite' => LOCALE_TRANSLATION_OVERWRITE_NONE,
-    ];
-    $this->drupalGet('admin/config/regional/translate/settings');
-    $this->submitForm($edit, 'Save configuration');
-
-    // Execute translation update.
-    $this->drupalGet('admin/reports/translations/check');
-    $this->drupalGet('admin/reports/translations');
-    $this->submitForm([], 'Update translations');
-
-    // Check whether existing translations have (not) been overwritten.
-    // cSpell:disable
-    $this->assertTranslation('January', 'Januar_customized', 'de');
-    $this->assertTranslation('February', 'Februar_customized', 'de');
-    $this->assertTranslation('March', 'Marz', 'de');
-    $this->assertTranslation('April', 'April_2', 'de');
-    $this->assertTranslation('May', 'Mai_customized', 'de');
-    $this->assertTranslation('June', 'Juni', 'de');
-    $this->assertTranslation('Monday', 'Montag', 'de');
-    // cSpell:enable
-  }
-
-  /**
-   * Tests automatic translation import when a module is enabled.
-   */
-  public function testEnableUninstallModule() {
-    // Make the hidden test modules look like a normal custom module.
-    \Drupal::state()->set('locale.test_system_info_alter', TRUE);
-
-    // Check if there is no translation yet.
-    $this->assertTranslation('Tuesday', '', 'de');
-
-    // Enable a module.
-    $edit = [
-      'modules[locale_test_translate][enable]' => 'locale_test_translate',
-    ];
-    $this->drupalGet('admin/modules');
-    $this->submitForm($edit, 'Install');
-
-    // Check if translations have been imported.
-    $this->assertSession()->pageTextContains("One translation file imported. 7 translations were added, 0 translations were updated and 0 translations were removed.");
-    // cSpell:disable-next-line
-    $this->assertTranslation('Tuesday', 'Dienstag', 'de');
-
-    $edit = [
-      'uninstall[locale_test_translate]' => 1,
-    ];
-    $this->drupalGet('admin/modules/uninstall');
-    $this->submitForm($edit, 'Uninstall');
-    $this->submitForm([], 'Uninstall');
-
-    // Check if the file data is removed from the database.
-    $history = locale_translation_get_file_history();
-    $this->assertFalse(isset($history['locale_test_translate']), 'Project removed from the file history');
-    $projects = locale_translation_get_projects();
-    $this->assertFalse(isset($projects['locale_test_translate']), 'Project removed from the project list');
-  }
-
-  /**
-   * Tests automatic translation import when a language is added.
-   *
-   * When a language is added, the system will check for translations files of
-   * enabled modules and will import them. When a language is removed the system
-   * will remove all translations of that language from the database.
-   */
-  public function testEnableLanguage() {
-    // Make the hidden test modules look like a normal custom module.
-    \Drupal::state()->set('locale.test_system_info_alter', TRUE);
-
-    // Enable a module.
-    $edit = [
-      'modules[locale_test_translate][enable]' => 'locale_test_translate',
-    ];
-    $this->drupalGet('admin/modules');
-    $this->submitForm($edit, 'Install');
-
-    // Check if there is no Dutch translation yet.
-    $this->assertTranslation('Extraday', '', 'nl');
-    // cSpell:disable-next-line
-    $this->assertTranslation('Tuesday', 'Dienstag', 'de');
-
-    // Add a language.
-    $edit = [
-      'predefined_langcode' => 'nl',
-    ];
-    $this->drupalGet('admin/config/regional/language/add');
-    $this->submitForm($edit, 'Add language');
-
-    // Check if the right number of translations are added.
-    $this->assertSession()->pageTextContains("One translation file imported. 8 translations were added, 0 translations were updated and 0 translations were removed.");
-    // cSpell:disable-next-line
-    $this->assertTranslation('Extraday', 'extra dag', 'nl');
-
-    // Check if the language data is added to the database.
-    $connection = Database::getConnection();
-    $result = $connection->select('locale_file', 'lf')
-      ->fields('lf', ['project'])
-      ->condition('langcode', 'nl')
-      ->execute()
-      ->fetchField();
-    $this->assertNotEmpty($result, 'Files added to file history');
-
-    // Remove a language.
-    $this->drupalGet('admin/config/regional/language/delete/nl');
-    $this->submitForm([], 'Delete');
-
-    // Check if the language data is removed from the database.
-    $result = $connection->select('locale_file', 'lf')
-      ->fields('lf', ['project'])
-      ->condition('langcode', 'nl')
-      ->execute()
-      ->fetchField();
-    $this->assertFalse($result, 'Files removed from file history');
-
-    // Check that the Dutch translation is gone.
-    $this->assertTranslation('Extraday', '', 'nl');
-    // cSpell:disable-next-line
-    $this->assertTranslation('Tuesday', 'Dienstag', 'de');
-  }
-
-  /**
-   * Tests automatic translation import when a custom language is added.
-   */
-  public function testEnableCustomLanguage() {
-    // Make the hidden test modules look like a normal custom module.
-    \Drupal::state()->set('locale.test_system_info_alter', TRUE);
-
-    // Enable a module.
-    $edit = [
-      'modules[locale_test_translate][enable]' => 'locale_test_translate',
-    ];
-    $this->drupalGet('admin/modules');
-    $this->submitForm($edit, 'Install');
-
-    // Create a custom language with language code 'xx' and a random
-    // name.
-    $langcode = 'xx';
-    $name = $this->randomMachineName(16);
-    $edit = [
-      'predefined_langcode' => 'custom',
-      'langcode' => $langcode,
-      'label' => $name,
-      'direction' => LanguageInterface::DIRECTION_LTR,
-    ];
-    $this->drupalGet('admin/config/regional/language/add');
-    $this->submitForm($edit, 'Add custom language');
-
-    // Ensure the translation file is automatically imported when the language
-    // was added.
-    $this->assertSession()->pageTextContains('One translation file imported.');
-    $this->assertSession()->pageTextContains('One translation string was skipped because of disallowed or malformed HTML');
-
-    // Ensure the strings were successfully imported.
-    $search = [
-      'string' => 'lundi',
-      'langcode' => $langcode,
-      'translation' => 'translated',
-    ];
-    $this->drupalGet('admin/config/regional/translate');
-    $this->submitForm($search, 'Filter');
-    $this->assertSession()->pageTextNotContains('No strings available.');
-
-    // Ensure the multiline string was imported.
-    $search = [
-      'string' => 'Source string for multiline translation',
-      'langcode' => $langcode,
-      'translation' => 'all',
-    ];
-    $this->drupalGet('admin/config/regional/translate');
-    $this->submitForm($search, 'Filter');
-    $this->assertSession()->pageTextContains('Multiline translation string to make sure that import works with it.');
-
-    // Ensure 'Allowed HTML source string' was imported but the translation for
-    // 'Another allowed HTML source string' was not because it contains invalid
-    // HTML.
-    $search = [
-      'string' => 'HTML source string',
-      'langcode' => $langcode,
-      'translation' => 'all',
-    ];
-    $this->drupalGet('admin/config/regional/translate');
-    $this->submitForm($search, 'Filter');
-    $this->assertSession()->pageTextContains('Allowed HTML source string');
-    $this->assertSession()->pageTextNotContains('Another allowed HTML source string');
-  }
-
 }