.../EntityResourceRestTestCoverageTest.php             | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceRestTestCoverageTest.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceRestTestCoverageTest.php
index 18121c1..1c9a00a 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceRestTestCoverageTest.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceRestTestCoverageTest.php
@@ -31,23 +31,24 @@ protected function setUp() {
     parent::setUp();
 
     $all_modules = system_rebuild_module_data();
-    $all_modules = array_filter($all_modules, function ($module) {
+    $stable_core_modules = array_filter($all_modules, function ($module) {
       // Filter contrib, hidden, already enabled modules and modules in the
-      // Testing package.
-      if ($module->origin !== 'core' || !empty($module->info['hidden']) || $module->status == TRUE || $module->info['package'] == 'Testing') {
+      // Testing and experimental packages.
+      if ($module->origin !== 'core' || !empty($module->info['hidden']) || $module->status == TRUE || $module->info['package'] == 'Testing' || $module->info['package'] == 'Core (Experimental)') {
         return FALSE;
       }
       return TRUE;
     });
 
-    \Drupal::service('module_installer')->install(array_keys($all_modules));
+    $this->container->get('module_installer')->install(array_keys($stable_core_modules));
+    $this->rebuildContainer();
 
-    $this->definitions = \Drupal::entityTypeManager()->getDefinitions();
+    $this->definitions = $this->container->get('entity_type.manager')->getDefinitions();
 
     // Remove definitions for which the REST resource plugin definition was
     // removed via hook_rest_resource_alter(). Entity types which are never
     // exposed via REST also don't need test coverage.
-    $resource_plugin_ids = array_keys(\Drupal::service('plugin.manager.rest')->getDefinitions());
+    $resource_plugin_ids = array_keys($this->container->get('plugin.manager.rest')->getDefinitions());
     foreach (array_keys($this->definitions) as $entity_type_id) {
       if (!in_array("entity:$entity_type_id", $resource_plugin_ids, TRUE)) {
         unset($this->definitions[$entity_type_id]);
@@ -129,7 +130,6 @@ public function testEntityTypeRestTestCoverage() {
    *   An information about progress of REST test coverage.
    */
   protected function getLlamaMessage($good, $all) {
-
     $a = $all;
     $g = $good;
 
@@ -141,8 +141,8 @@ protected function getLlamaMessage($good, $all) {
 ☼
       ________________________
      /           Hi!          \\
-    | What about a few of cool |
-    |        REST tests?       |
+    |  It's llame to not have  |
+    |   complete REST tests!   |
     |                          |
     |     Progress: $g/$a.     |
     | ________________________/