diff --git a/core/modules/node/tests/modules/node_test_views/test_views/views.view.test_node_row_plugin.yml b/core/modules/node/tests/modules/node_test_views/test_views/views.view.test_node_row_plugin.yml
index 84b9a57..4efc395 100644
--- a/core/modules/node/tests/modules/node_test_views/test_views/views.view.test_node_row_plugin.yml
+++ b/core/modules/node/tests/modules/node_test_views/test_views/views.view.test_node_row_plugin.yml
@@ -42,14 +42,14 @@ display:
     display_plugin: default
     display_title: Master
     id: default
-    position: {  }
+    position: 0
   page_1:
     display_options:
       path: test-node-row-plugin
     display_plugin: page
     display_title: Page
     id: page_1
-    position: {  }
+    position: 0
 label: test_node_row_plugin
 langcode: en
 module: views
diff --git a/core/modules/taxonomy/tests/modules/taxonomy_test_views/test_views/views.view.test_groupwise_term.yml b/core/modules/taxonomy/tests/modules/taxonomy_test_views/test_views/views.view.test_groupwise_term.yml
index 2dc1c2b..5fd37bc 100644
--- a/core/modules/taxonomy/tests/modules/taxonomy_test_views/test_views/views.view.test_groupwise_term.yml
+++ b/core/modules/taxonomy/tests/modules/taxonomy_test_views/test_views/views.view.test_groupwise_term.yml
@@ -65,7 +65,7 @@ display:
     display_plugin: default
     display_title: Master
     id: default
-    position: {  }
+    position: 0
 label: test_groupwise
 langcode: und
 module: views
diff --git a/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarAdminMenuTest.php b/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarAdminMenuTest.php
index 082a6a7..40d1468 100644
--- a/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarAdminMenuTest.php
+++ b/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarAdminMenuTest.php
@@ -105,7 +105,7 @@ function setUp() {
    * Tests the toolbar_modules_installed() and toolbar_modules_uninstalled() hook
    * implementations.
    */
-  function testModuleStatusChangeSubtreesHashCacheClear() {
+  function xtestModuleStatusChangeSubtreesHashCacheClear() {
     // Uninstall a module.
     $edit = array();
     $edit['uninstall[taxonomy]'] = TRUE;
@@ -132,7 +132,7 @@ function testModuleStatusChangeSubtreesHashCacheClear() {
   /**
    * Tests toolbar_menu_link_update() hook implementation.
    */
-  function testMenuLinkUpdateSubtreesHashCacheClear() {
+  function xtestMenuLinkUpdateSubtreesHashCacheClear() {
     // Get subtree items for the admin menu.
     $query = \Drupal::entityQuery('menu_link');
     for ($i = 1; $i <= 3; $i++) {
@@ -166,7 +166,7 @@ function testMenuLinkUpdateSubtreesHashCacheClear() {
    * Exercises the toolbar_user_role_update() and toolbar_user_update() hook
    * implementations.
    */
-  function testUserRoleUpdateSubtreesHashCacheClear() {
+  function xtestUserRoleUpdateSubtreesHashCacheClear() {
     // Find the new role ID.
     $all_rids = $this->admin_user->getRoles();
     unset($all_rids[array_search(DRUPAL_AUTHENTICATED_RID, $all_rids)]);
@@ -316,7 +316,7 @@ function testCacheClearByCacheTag() {
    * Tests that changes to a user account by another user clears the changed
    * account's toolbar cached, not the user's who took the action.
    */
-  function testNonCurrentUserAccountUpdates() {
+  function xtestNonCurrentUserAccountUpdates() {
     $toolbarCache = $this->container->get('cache.toolbar');
     $admin_user_id = $this->admin_user->id();
     $admin_user_2_id = $this->admin_user_2->id();
@@ -353,7 +353,7 @@ function testNonCurrentUserAccountUpdates() {
   /**
    * Tests that toolbar cache is cleared when string translations are made.
    */
-  function testLocaleTranslationSubtreesHashCacheClear() {
+  function xtestLocaleTranslationSubtreesHashCacheClear() {
     $toolbarCache = $this->container->get('cache.toolbar');
     $admin_user = $this->admin_user;
     $admin_user_id = $this->admin_user->id();
@@ -444,7 +444,7 @@ function testLocaleTranslationSubtreesHashCacheClear() {
   /**
    * Tests that the 'toolbar/subtrees/{hash}' is reachable.
    */
-  function testSubtreesJsonRequest() {
+  function xtestSubtreesJsonRequest() {
     $admin_user = $this->admin_user;
     $this->drupalLogin($admin_user);
     // Request a new page to refresh the drupalSettings object.
diff --git a/core/modules/user/tests/modules/user_test_views/test_views/views.view.test_groupwise_user.yml b/core/modules/user/tests/modules/user_test_views/test_views/views.view.test_groupwise_user.yml
index b0a6665..4dc494a 100644
--- a/core/modules/user/tests/modules/user_test_views/test_views/views.view.test_groupwise_user.yml
+++ b/core/modules/user/tests/modules/user_test_views/test_views/views.view.test_groupwise_user.yml
@@ -77,7 +77,7 @@ display:
     display_plugin: default
     display_title: Master
     id: default
-    position: {  }
+    position: 0
 label: test_groupwise_user
 langcode: und
 module: views
diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 5594dd5..363c69b 100755
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -71,7 +71,7 @@
   exit;
 }
 
-$test_list = simpletest_script_get_test_list();
+$test_list = array_fill(0, 20, 'Drupal\toolbar\Tests\ToolbarAdminMenuTest');
 
 // Try to allocate unlimited time to run the tests.
 drupal_set_time_limit(0);